Time Finder

Copyright 2004 EMC Corporation. All Rights Reserved.

TimeFinder Foundations, 1

EMC Global Education 2004 EMC Corporation. All rights reserved.

Introduction to Enterprise Business ContinuityPart 1

Welcome to Part 1 of TimeFinder Foundations - Introduction to Enterprise Business Continuity. This section introduces Business Continuity Solutions. It starts with a basic definition, then shows the business requirements for Business Continuity, followed by the history of Data Protection as a key component to Business Continuity.

Copyright 2004 EMC Corporation. All rights reserved. These materials may not be copied without EMC's written consent.EMC believes the information in this publication is accurate as of its publication date. The information is subject to change without notice. THE INFORMATION IN THIS PUBLICATION IS PROVIDED AS IS. EMC CORPORATION MAKES NO REPRESENTATIONS OR WARRANTIES OF ANY KIND WITH RESPECT TO THE INFORMATION IN THIS PUBLICATION, AND SPECIFICALLY DISCLAIMS IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.Use, copying, and distribution of any EMC software described in this publication requires an applicable software license.




2

Audio Portion of this Course

z The AUDIO portion of this course is supplemental to the material and is not a replacement for the student notes accompanying this course.

z EMC recommends downloading the Student Resource Guide (from the Supporting Materials tab) and reading the notes in their entirety.

The AUDIO portion of this course is supplemental to the material and is not a replacement for the student notes accompanying this course.EMC recommends downloading the Student Resource Guide from the Supporting Materials tab, and reading the notes in their entirety.




3

EMC Technology Foundations

z EMC Technology Foundations (ETF) is a curriculum that presents overviews of EMC products and technologies including: Symmetrix and CLARiiON Storage Platforms and Software SAN, NAS and CAS Networked Storage Solutions Advanced storage management software

z The EMC Technology portfolio consists of end-to-end services and platforms designed to accelerate the implementation of Information Lifecycle Management (ILM)

z ILM uses EMC technologies to enable organizations to better, andmore cost-effectively, manage and protect their data, and achieve regulatory compliance. It improves the availability of their business information in a way that connects its use to business goals andservice levels

z This course represents one part of the ETF curriculum

Companies across all industries are constantly launching new business-critical applications turning information into strategic corporate assets. Value to the bottom line for customers, suppliers, and partners is often directly related to how easily this information can be shared across the enterprise and beyond.

Information Lifecycle Management (ILM) is a flexible information-centric strategy that includes automating the process of connecting applications and servers in an organization to its companys information. ILM includes Direct Attached Storage (DAS), Storage Area Network (SAN), Network Attached Storage (NAS), Content Addressed Storage (CAS), and software for management and automated provisioning.

ILM facilitates the integration of SAN and NAS, extends the reach of enterprise storage, and delivers a common way to manage, share, and protect information. It also takes advantage of todays network and channel technologies to consolidate servers and storage, centralize backup, and manage the explosive growth of data.




4

Course Objectives

After completing this course, you will be able to:z Explain the concept of Business Continuityz List the benefits of Business Continuity regarding

expenses incurred as a result of downtimez Explain how EMC uses Local and Remote mirroring in

its storage methodologies to maintain data protection

The objectives for this course are shown here. Please take a moment to read them.




5

What is Business Continuity?

z Business Continuity is the preparation for, response to, and recovery from an application outage that adversely affects business operations

z Business Continuity Solutions addresses systems unavailability, degraded application performance, or unacceptable recovery strategies

Business Continuity remains at the top of every executives priority list. Yet executives find themselves in a financial tug-of-war between business continuity solutions and other projects, competing for limited resources. Fundamental to business continuity is the need to understand an organizations practices relative to the protection, availability and usability of data.




6

Lost RevenueKnow the downtime costs per hour, day, two days... Number of employees

impacted * hours out * hourly rate

Damaged Reputation

Customers Suppliers Financial markets Banks Business partners

Financial Performance

Revenue recognition Cash flow Lost discounts (A/P) Payment guarantees Credit rating Stock price

Other ExpensesTemporary employees, equipment rental, overtime costs, extra shipping costs, travel expenses...

Why Business Continuity?

Direct loss Compensatory payments Lost future revenue Billing losses Investment losses

Lost Productivity

There are many factors that need to be considered when calculating the cost of downtime. A formula to calculate the costs of the outage should capture both the cost of lost productivity of employees, and the cost of lost income from missed sales. The Estimated average cost of 1 hour of downtime = (Employee costs per hour) *( Number of employees affected by outage) + (Average Income per hour).Employee costs per hour is simply the total salaries and benefits of all employees per week divided by the average number of working hours per week. Average income per hour is just the total income of an institution per week divided by average number of hours per week an institution is open for business.




7

Business Continuity Obstacles of Availability

Disaster (




8

Cost of Downtime Per Hour By Industry

Source: AMR Research

Investments

Retail

Insurance

$0 $100,000 $200,000 $300,000 $400,000

Telecom

Banking

Transportation

Manufacturing

The selection of a business continuance solution includes many factors, but the most important factor is typically the cost to invest in the solution. This cost can encompass hardware, software, floor space, people, time, etc.To put into perspective the cost to invest in a business continuance solution, it is important to understand the loss of revenue for downtime. AMR Research put together a chart based on category of industry (see chart) to demonstrate the dollars of revenue lost per hour of system downtime. A business continuance solution is an insurance policy for the protection of your data. Is losing or compromising the integrity of your companys critical information a risk you are willing to take?EMC PS is made up of experts who understand 24x7x365 continuous availability, and the use of EMC systems and software to achieve it. They address information storage needs from a strategic perspective, and focus on the business requirements and the application of storage technology to address those requirements. EMCs consultants use a framework of proven processes and industry-leading best practices and methodologies. This framework addresses all phases of an enterprise solution, and ensures a consistent and effective process for creating an information-centric infrastructure.




9

Business Continuity Starts with Data Protection

z Local Mirroring is a method for protecting data by maintaining the data on two mirrored volumes within the same storage unit

z Remote Mirroring is a method for protecting data by maintaining the data on two mirrored volumes, with the volumes residing in different storage units

Without the Data there is no Recovery!

The technique that EMC has embraced for Data Protection is to use multiple copies of data. This is not a new idea. What EMC has brought to the table is new and unique, intelligent storage methodologies that:

Replicate data internally within storage arrays, or externally across distances between storage arrays Facilitate and enable parallel access to data instances Allow users to perform various workloads without conflict Dramatically change the time, effort, risk, and complexity of remote business resumption




10

Data Protection with Disk Mirroring

Standard Disk

Mirrored Disk1991

Remote Mirror1994

Before Mirroring, the entire drive would be allocated for data and, used by the operating system or application, and be unprotected in the event of a failure. Disk Mirroring introduced a technique in which data is simultaneously written to duplicate disks. If one of the disks fails, the system or application can continue without any loss of data or disruption in service. First introduced by EMC, Remote Mirroring extended the Data Protection across Storage Subsystems protecting against a drive and subsystem failure. If a drive failed, access was only available on the secondary storage subsystem.




11

Multiple Mirrors - Multiple Uses

Backups and Decision Support at Multiple Sites withFull Protection of Volumes and Data Centers

Application BackupsApplication DevelopmentData Warehouse Extract

Recovery Testing

Application BackupsApplication DevelopmentData Warehouse Extract

Recovery Testing

High Availability Disaster Restart

High Availability Disaster Restart

Data Base Integrity Reporting

Quality AssuranceData Warehouse Load

Data Base Integrity Reporting

Quality AssuranceData Warehouse Load

BCVBCV

BCVBCV

Symmetrix BSymmetrix A

Symmetrix BSymmetrix A

1997Dynamic Disk

Mirrors

1997Dynamic Disk

Mirrors

1995Dual Remote

Mirrors

1995Dual Remote

Mirrors

2001Enterprise

Consistency Technology

2001Enterprise

Consistency Technology

BCVBCV

Dual Remote Mirroring offered local protection as well as the extended protection across storage subsystems. This offered local protection against a drive failure so access to data was not required to span the secondary storage subsystem.Dynamic Disk Mirroring introduced a technique in which a special disk device is dynamically mirrored to a mirrored disk pair and split for Business Operations. Enterprise Consistency Groups introduce the ability to have a re-startable point of consistency image across platforms.




12

EMC Business Continuity Solution Choices

PowerPathPowerPathI/O Path Failover GeoSpanCluster CopyCrossTape Replacement

ERMERMSDMMSRDF/ARReplication Automation

SAN CopyMirrorView/ASRDF/AMirrorViewSRDFRemote Replication SnapViewTimeFinder/SnapCloneTimeFinder/CloneSnapView/CloneTimeFinder/MirrorLocal Replication CLARiiONSymmetrixProduct Type

Organizations are looking to ensure their information is protected during downtime. EMC sets the standard in business continuity hardware, software and services.

TimeFinder is software that creates copies of production data for repurposing.

SnapView is a point-in-time copy application on CLARiiON storage systems.

TimeFinder Clone is point-in-time software for data stored on a Symmetrix.

EMC Snap software offers space-saving, point-in-time "copies" for Symmetrix DMX.

SRDF is software used to maintain a duplicate copy of data across distances.

SRDF/A offers asynchronous remote replication solutions for Symmetrix DMX.

SRDF/AR automates point-in-time disaster restart using EMC TimeFinder.

MirrorView is CLARiiON software that enables synchronous data mirroring.

SAN Copy is CLARiiON software used for data migration across the SAN.

ERM simplifies and automates the management of local replication.

CopyCross is an MVS software product that uses disk to emulate a tape device.

GeoSpan integrates SRDF and Cluster technologies automating disaster recovery.

PowerPath is host-resident software that manages host-to-storage I/O data paths.




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Business Continuity is a Core EMC Competency

z In-depth knowledge and experience Information management Mission critical environments BC planning and technology

z Disciplined and proven methodologyz Ability to provide objective site & platform roadmaps

and recommendationsz Commitment to customer satisfactionz Strategic alliances and partnerships

EMC has been, and is, the recognized industry leader providing the highest level of recovery capabilities and business continuance solutions in the world today.




14

Course Summary

Key Points covered in this course:z The concept of Business Continuityz Benefits of Business Continuity regarding expenses

incurred as a result of downtimez How EMC uses Local and Remote mirroring in its

storage methodologies to maintain data protection

Key points that were covered in this course are shown here. Please take a moment to review them.




TimeFinder Foundations

Welcome to Part 2 of TimeFinder Foundations. Part 1of this course focused on Enterprise Business Continuity Solutions. The purpose of this section is to provide an introduction to TimeFinder, EMCs Business Continuity solution for Symmetrix Local Replication.




16

Audio Portion of this Course

z The AUDIO portion of this course is supplemental to the material and is not a replacement for the student notes accompanying this course.

z EMC recommends downloading the Student Resource Guide (from the Supporting Materials tab) and reading the notes in their entirety.

The AUDIO portion of this course is supplemental to the material and is not a replacement for the student notes accompanying this course.EMC recommends downloading the Student Resource Guide from the Supporting Materials tab, and reading the notes in their entirety.




17

EMC Technology Foundations

z EMC Technology Foundations (ETF) is a curriculum that presents overviews of EMC products and technologies including: Symmetrix and CLARiiON Storage Platforms and Software SAN, NAS and CAS Networked Storage Solutions Advanced storage management software

z The EMC Technology portfolio consists of end-to-end services and platforms designed to accelerate the implementation of Information Lifecycle Management (ILM)

z ILM uses EMC technologies to enable organizations to better, andmore cost-effectively, manage and protect their data, and achieve regulatory compliance. It improves the availability of their business information in a way that connects its use to business goals andservice levels

z This course represents one part of the ETF curriculum

Companies across all industries are constantly launching new business-critical applications turning information into strategic corporate assets. Value to the bottom line for customers, suppliers, and partners is often directly related to how easily this information can be shared across the enterprise and beyond.

Information Lifecycle Management (ILM) is a flexible information-centric strategy that includes automating the process of connecting applications and servers in an organization to its companys information. ILM includes Direct Attached Storage (DAS), Storage Area Network (SAN), Network Attached Storage (NAS), Content Addressed Storage (CAS), and software for management and automated provisioning.

ILM facilitates the integration of SAN and NAS, extends the reach of enterprise storage, and delivers a common way to manage, share, and protect information. It also takes advantage of todays network and channel technologies to consolidate servers and storage, centralize backup, and manage the explosive growth of data.




18

TimeFinder Foundations

After completing this course, you will be able to:z Identify the functional concepts of TimeFinder z List the benefits of TimeFinder z Note the differences between the various TimeFinder

Replication Solutions

The objectives for this course are shown here. Please take a moment to read them.




19

The TimeFinder Product Family

Tim

eFin

der F

amily

Tim

eFin

der F

amily

Local BCV OptionsLocal BCV Options

TimeFinder/Mirror

High-Performance, Full-Volume Copies

*Plus Mainframe SNAP and Clones

TimeFinder/Snap

Economical Pointer-Based Snap Copies

Add-On Functions

TimeFinder/CGConsistency

Groups

TimeFinder/EIMExchangeIntegration

TimeFinder/SIMSQL

Integration

Tim

eFin

der F

amily

Tim

eFin

der F

amily

Tim

eFin

der F

amily

Tim

eFin

der F

amily


TimeFinder/Mirror



TimeFinder/Snap



TimeFinder/Mirror



TimeFinder/Snap


Add-On Functions


Groups


TimeFinder/SIMSQL

Integration

Add-On Functions


Groups


TimeFinder/SIMSQL

Integration

z Offers solutions to several business continuance scenarios

z Consists of two base solutions:

TimeFinder/Mirror TimeFinder/Snap

z Consists of three add-on solutions:

TimeFinder/Consistency Groups

TimeFinder/Exchange Integration Module

TimeFinder/SQL Integration Module

The TimeFinder Product Family The TimeFinder family offers solutions to several business continuance scenarios. The TimeFinder family consists of two base solutions: TimeFinder/Mirror and TimeFinder/Snap. TimeFinder/Mirror includes BCVs, Clones, and Mainframe SNAP. TimeFinder/Snap, formerly EMC Snap, is a Pointer Based Snap Copy.

The add-on solutions include: TimeFinder/Consistency Groups, TimeFinder/Exchange Integration Module, and TimeFinder/SQL Integration Module. This course covers both TimeFinder/Mirror and TimeFinder/Snap.

TimeFinder/Mirror is classic TimeFinder. Classic TimeFinder and the new TimeFinder/Mirror include the following: full-copy mirrors, open systems clone, and mainframe SNAP. Note, Consistency technology has been removed from the base product and is now available as an add-on option.TimeFinder/SnapThis product was formerly known as EMC Snap, the pointer-based, space-saving snapshot BCV solution for Symmetrix DMX systems. Note, Consistency technology has been removed from the base product and is now available as an add-on option. Optional, Add-on FunctionalityTimeFinder/Consistency Groups (TimeFinder/CG) was formerly part of classic TimeFinder. It is now available as an option to any of the base solutions, enabling Enginuity Consistency Assist (ECA) to maintain data coherency across TimeFinder-protected volumes, to ensure data consistency and restartability. New functionality will enable consistent image sets to be created both within and across multiple Symmetrix systems.TimeFinder/Exchange Integration Module (TimeFinder/EIM) was formerly part of ResourcePak for Windows, but is now available as an option to any of the base TimeFinder solutions, for those customers needing to quickly and easily integrate TimeFinder and Microsoft Exchange. TimeFinder/EIM also ships with Symmetrix Integration Utilities (SIU), also formerly available in ResourcePak for Windows. TimeFinder/SQL Integration Module (TimeFinder/SIM) was formerly part of ResourcePak for Windows, but is now available as an option to any of the base TimeFinder solutions for those customers needing to quickly and easily integrate TimeFinder and SQL Server. TimeFinder/SIM also ships with Symmetrix Integration Utilities (SIU), also formerly available in ResourcePak for Windows.




20

ECC/OEECC/OE Metro East

Data warehousing Application testing

BCV 1

BCV 2

BCV 3

Backups Web content refresh

3rd party SW updates Decision support

Sales

Non-disruptively creates a mirrored copy of an active application volume, or set of

volumes, within the same Symmetrix

TimeFinder/Mirror - BCVs

z Repurposing z Non-disruptive incremental

resynchronization

z Consistent methodology for all platforms

z Maximize business operations by enabling parallel processing

TimeFinder allows companies to make more effective use of their most valuable resources, by enabling parallel information access as opposed to traditional sequential information access, thus eliminating the need to do things like quiesce an application for backups.TimeFinder Business Continuity is possible due to Business Continuance Volume (BCV) devices. These BCV devices are standard Symmetrix devices that are specially configured to be dynamic mirrors. Each BCV device has its own host address, and is configured as a stand-alone device. BCV and Standard devices should be configured on opposing Front End and Back End Directors for redundant paths.EMC ControlCenter provides an interface to control the use of BCV devices that already exist in the Symmetrix configuration. Configuring Symmetrix units as BCV devices is done by the Customer Service Engineer during installation, or by the customer with EMC ControlCenter Symmetrix Manager, or Solutions Enabler commands.




21

StandardStandard BCVBCV

Business Continuance Volumes

z A BCV is a Symmetrix volume with special attributes that allow it to be attached to another Symmetrix Logical Volume within the same Symmetrix as the next available mirror

z Each BCV device has its own host address (TID/LUN) and Symmetrix device number

z BCVs must be the same size (Cyls) and type (CKD/FBA) as the Standard device which it will mirror

M1 M4M3M2M1 M4M3M2

A BCV is a Symmetrix volume with special attributes that allow it to be attached to another Symmetrix Logical Volume within the same Symmetrix as the next available mirror. It must be of the same size and type as the device which it will mirror. Each BCV has its own host address and Symmetrix device number.




22

Protected BCV Devices

z A BCV may be protected with a local mirror

z When a BCV is split, the BCV mirror is synchronized

z When a BCV is established, its local mirror is suspended

MirrorMirrorBCVBCV

StandardStandardvolumevolume

MirrorMirrorBCVBCV


MirrorMirror

BCVBCV


A BCV can be configured with a mirror device as shown in this slide. When a BCV is paired with a Standard device, the relationship with its mirror is broken. Immediately after the split of the BCV from the Standard device, the split BCV and its mirror resynchronize in the direction specified on the Split action.




23

SRDF Protected BCV Devices

z When an SRDF Protected BCV is established, data is not synchronized to the SRDF Target. The SRDF link between the R1/BCV and its R2 pair is logically suspended

z When an SRDF Protected BCV is split, changed tracks are synchronized to the SRDF Target

R1/BCVR1/BCV


R2R2 R1/BCVR1/BCV


R2R2

BCVs can be SRDF protected. When an SRDF Protected BCV is established, data is not synchronized to the SRDF Target. The SRDF link between the SRDF pair is logically suspended. When an SRDF Protected BCV is split, changed tracks are synchronized to the SRDF Target.




24

Incremental establish

or

Incremental restore


BCVBCV 4:00 a.m.

2:00 a.m.

4:00 a.m.

6:00 a.m.


EstablishSplit

EstablishSplit

BCVBCV

BCVBCV

BCVBCV

Multi-BCVsz Standard device keeps track of changes to multiple BCVs one after the

otherz Incremental establish or restore now possible with up to eight (default)

BCVs

Different BCVs can be established and then split from a Standard volume at different times of the day. It used to be that the Symmetrix did not keep track tables for the previous BCVs; the track table was only for the last, most recent BCV. Thus, a BCV that was split at 3:00 a.m. could not be re-established if another BCV had been established and split at 4:00 a.m. The 3:00 a.m. BCV would have to be established (full volume copy) again.With the Multi-BCV function, up to eight (default) BCVs will be maintained by the Symmetrix. In other words, a BCV that was split at 4:00 a.m. can be re-established even though another BCV was established and split at 5:00 a.m. In this way, a user can split and incrementally re-establish volumes throughout the day or night, and still keep re-establish times to a minimum, thus allowing multiple BCVs to maintain an incremental relationship with the same Standard device.Incremental information can be retained between a STD (Standard) device and multiple BCV devices, provided the BCV devices have not been paired with different STD devices.The maximum number of BCVs that can be paired with the same STD device can be increased to as many as 16, using the SYMCLI_MAX_BCV_PAIRS TimeFinder Solutions Enabler command variable.




25

Concurrent BCVs

z Establish two BCVs with the same standard simultaneously, or one after the other

z The BCVs can be split individually or simultaneously

z Each BCV will occupy a mirror position - locally protected R1 Volumes cannot have two BCVs established with them concurrently

z Concurrent restores are not allowed


BCV1BCV1

BCV2BCV2


Concurrent BCVs is a TimeFinder/Mirror - BCV feature that allows two BCVs to be simultaneously established with a Standard volume. The BCV pair can be split providing customers with two copies of the customers data. Each BCV can be mounted online and made available for processing.




26

TimeFinder/Mirror - BCV Operations

z Establish BCV pairs Synchronize the Standard volume to the BCV volume Options

Full or Incremental (default)l Establish

z Split BCV pairs Terminate mirror relationship between BCV and

Standard volumes Options

Differential Split Reverse Split Instant Split (default) Consistent Split

z Restore BCV pairs Synchronize contents of BCV volume to the Standard

volume Options

Full or Incremental (default) Restore

z Verify all BCV device Provide current status of BCV/Standard volume pairs

BCVBCV

BCVBCV

BCVBCV

StandardStandardVolumeVolume



TimeFinder/Mirror - BCV allows the user to create several host-based business continuity operations, and control these operations through host commands. The user can establish a BCV, then split it to make the BCV available to a host/server. After completing the business continuity processes on the BCV device, the user can re-establish the BCV pair. Typical BCV operations include establish, split, re-establish, restore, incremental restore, and verify.




27

Business Continuance Volumes

z Establishing and Splitting a BCV

SPLIT

Unavailable to host

Accessible by host


BCVBCV

BCVBCVESTABLISH

BCVs must first be established. For example, the BCV must first be made Not Ready (unavailable to the host), then the entire contents of the Standard is copied to the BCV. When this is completed, the BCV can be split from the Standard volume and mounted to the host or another host. A split is instant.As many BCVs as required can be created.BCVs can also be re-established, e.g., the data that the BCV contains can be updated with changes that have occurred on the Standard volume.




28

ProductionProduction BCVBCV

DATADATA

DATA

DATADATA

DATADATA

DATA

DATADATA

Synchronized BCV


UPDATED TRACKDATA

UPDATED TRACK

DATADATA

BCV is SPLIT from production volume

DATAUPDATED TRACK

DATA

DATADATA

Splitting a BCV

z Activity is quiesced on the production volume; create a point-in-time version of the data

z The split command ends the mirroring between the Standard volume (production) and the BCV

z Activity is restarted on production

z BCV is now addressable as a point-in-time copy of the original production volume

z As updates occur, Symmetrix maintains a log of updates to both volumes

In this example, the production volume and the BCV were established (see upper diagram), and then split (lower diagram). Updates are now being maintained in track tables for both the production volume and the BCV, until they are re-established or restored.Instant Split enables a volume that was previously established to be split almost instantaneouslyin less than a second from the viewpoint of the host or server. Completion of the split process runs as a background task. This is the default Split operation for TimeFinder.Default Split operations for TimeFinder occur as follows: BCV devices are set to R/W status instantaneously after a split command is executed. The BC applications

have immediate access to the BCV devices. Requests (from the BCV or the STD) for tracks that have not been split are handled on a priority basis.The Instant Split considerably reduces the time for which a DB has to be held in hot-backup mode during an on-line split.




29

ProductionProduction11

ProductionProduction22

ProductionProductionnn

BCV 1BCV 1

BCV 2BCV 2

BCV nBCV n

Consistent Split

z Performs an Instant Split across a group of devices using a single Consistent Split command

z All the BCVs in the group are thus consistent point-in-time copies

z Used to create a consistent point-in-time copy of an entire system, an entire database, or any associated set of volumes

z Can create consistent splits on remote BCVs through SRDF

Consistent Split allows the creation of a group of BCVs that contain a point-in-time image of an entire system, database, or group of associated volumes.




30

Reverse Split

z A reverse split will overwrite the newly synchronized productiondata on the BCV with the original data from its mirror

MirrorMirrorBCVBCV


MirrorMirrorBCVBCV


In an established state, any logical corruption on the STD will be propagated to its BCV. The reverse split option allows the recovery back to a prior point in time. The reverse split will revert the BCV back to a prior point in time copy. This prior point in time copy can now be used in the recovery of the STD to the same prior point in time.




31

PowerPath and ECA Consistent Splits

PowerPath-based Split

z PowerPath holds I/O before splitz Performed from host doing I/Oz Affects one hostz Does not require independent

access to a gatekeeper

z Symmetrix holds I/O before splitz Performed by any Symmetrix-

attached hostz Requires independent access to a

gatekeeper

ECA-based Split

HostHost

BCVBCVBCVBCVSTDSTD STDSTD

PowerPath and ECA Consistent Splits: Are Implemented in host based SYMAPI and PowerPath software. Allow hot splits of re-startable database images without quiescing or placing DB in hot backup mode. Provide application support for Oracle, IBM UDB, SQL Server. PowerPath suspends I/O to the devices involved in the DB, instant split is executed, and PowerPath then resumes I/O to the devices.Enginuity Consistency Assist (ECA) can hold I/O at the Symmetrix level eliminates the need for PowerPath. Consistency is maintained across multiple servers (not multiple Symmetrixes).




32

Re-establishing a BCV Pair

z Volume pair (Production and BCV) have been split

z Tracks on production updated after split

z Tracks on BCV have also been updated after split

z Symmetrix keeps table of changed tracks after split

z At re-establish, changed tracks are written from production to BCV (incremental re-establish)

z Synchronization then completes


UPDATED TRACKDATA

UPDATED TRACK

DATADATA

DATAUPDATED TRACK

DATA

DATADATA

Split BCV pair


UPDATED TRACKDATA

UPDATED TRACK

DATADATA

UPDATED TRACKDATA

UPDATED TRACK

DATADATA

Re-establish BCV pair

In this case, the production volume and the BCV were split, and updates have occurred on both volumes (top). A re-establish will join the two volumes back as a BCV pair (bottom). All updates that have occurred on the production volume must be transferred to the BCV.All updates that occurred on the BCV also must be replaced. This is accomplished by overwriting the records on the BCV with the corresponding records from the production volume. This in essence destroys the updates that have occurred on the BCV. Remember, in a re-establishment activity, the direction of the data flow is from the production volume to the BCV.




33


UPDATED TRACKDATA

UPDATED TRACK

DATADATA

DATAUPDATED TRACK

DATA

DATADATA

Split BCV pair


DATAUPDATED TRACK

DATADATA

DATA

DATA

UPDATED TRACK

DATADATA

Re-store BCV pair

DATA

Restoring from a BCV

z Production and BCV have been split

z Production has been corrupted

z Symmetrix has table of these changed tracks after split

z Restore to production from BCV with known good data

z Recovery complete

The Restore is very powerful and can serve many uses. However, caution must be taken before issuing the command. The changes that have occurred on the production volume will be destroyed (lower diagram). The corresponding records from the BCV will be written to the production volume. The changes that have occurred on the BCV will be written to the production volume. Remember, in a Restore function, the direction of the data flow is from the BCV to the production volume.During a Restore operation, the BCV is first made Not Ready (unavailable to the host), the contents of the BCV are then copied to the Standard device.




34

Sample TimeFinder/Mirror - BCV Operation

z Establish BCV with Standard volume

z Stop I/O for point-in-time copy

z Split BCV (BCV now uniquely addressable)

z Start I/O against Standard volume

z Execute operations against BCVs in parallel

z Re-establish BCV as required with production volume (resynchronization)

StandardStandardvolumevolume BCVBCV

Here are some details on establishing a BCV pair. Lets first look at BCV implementation in its simplest form. As indicated, the user needs to first establish a logical connection between the Standard volume and the BCV.

This will cause the Symmetrix system to synchronize these volumes, or to make them exact mirrors. Once the system indicates to the host that this has been accomplished, all writes to the Standard volume will also

be posted to the BCV. Then, stop I/O or quiesce the application, waiting for application and access method buffers to write all data to the Symmetrix system.

At this point, split the BCV from the STD, thereby stopping the synchronization between volumes. Processing can then take place against the BCV as well as the STD.

After the volumes have been split, the system maintains a table of invalid tracks or tracks on the STD which have been updated but not posted to the BCV. If the BCV is re-established back to the original STD, the system uses this information to minimize the time required to resynch the BCV pair.




35

z Repurposing z Consistent methodology for

all platforms

z Copy on Access to allow for instant availability of Clone

z Point-in-time copy on Standard or BCV Device

TimeFinder/Clone


Data warehousingApplication testing

Clone1

Clone2

Clone3

BackupsWeb content refresh

3rd party SW updatesDecision support

Sales



TimeFinder/Mirror - Clone allows companies to make more effective use of their most valuable resources by enabling parallel information access. It allows a clone to be dynamically created on either Standard or BCV devices. This allows copies to be created without having to reconfigure the Symmetrix for Business Continuance Volumes.




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TimeFinder/Clone

z Clone command to activate point-in-timez Data copied on first access (by default)z Optional setting copies all tracks without waiting for

access

Source Target Device

Standardor

BCV

No data moved initially Appears to host like source device Source and Target must be the same

size (open systems)

A clone is a point-in-time image of the full source volume in open systems. When creating a clone image, it is not necessary to first perform a full establish operation as you would with traditional TimeFinder/Mirror - BCVs. Upon activation of the cloned image, it is fully read/write enabled; data is copied as it is accessed or, optionally, all the source tracks are copied in the background immediately upon activation.




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Copy On Access

z Data is copied to the Target device The first time a track on the source device is written to or a track on the target is accessed (read or write)


Writeto

TrackOriginal

Track

Using the copy on access method when activating a Clone means that the first time a track is either written to or read from, then the track is copied to the Clone. In this case, both the source and the Clone are affected by the IO.




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Restoring from a Clone

z Technically it is not a restore but a new Clonez Steps would be:

Create a clone with a copy option After the copy is complete, terminate the clone session Now start a fresh cloning session using old target as new source


Restoring Original Data

Target device is unchanged after reversing direction of copy

Restoring from a Clone actually creates a new clone session. The original session must be terminated before a restore (new clone session) can be initiated.




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z Repurposing z Reduces Disk Space

required for Mirrored Copy

z Copy-on-write technique to conserve disk space

z Non-disruptive incremental resynchronization

z Maximize business operations by enabling parallel processing

TimeFinder/SNAP


Data warehousingApplication testing

BackupsWeb content refresh

3rd party SW updatesDecision support



VDEV1

VDEV2

VDEV3

Sales

Every business strives to increase productivity and utilization of its most important resourceinformation. The information asset is key to finding the right customers, building the right products, and offering the best service. The greater the extent that this corporate information can be shared, re-used, and exploited, the greater competitive advantage a company can gain.So lets look at this business challenge: increase productivity through parallel access to information. Imagine that you could create the environment where a single instance of corporate information could be accessed in parallel by multiple business units, and where you could retain multiple checkpoints of that data throughout the day without consuming large amounts of disk space. Imagine an environment where you can improve service levels by eliminating the stop-and-go sequential information access methods of the past. What would this environment do for the enterprise?

Increase application availability while reducing downtime Minimize data exposure and recovery time through creating more frequent point-in-time images of data Enable non-disruptive access to critical data for concurrent processing

Backup, reporting, testing, migrations, data warehousing Provide improved data recovery and application consistency Reduce replication Total Cost of Ownership (TCO) while meeting new and ever changing service levels




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TimeFinder/Snap for Symmetrix DMXz Snapshots create logical

point-in-time images of a source volume

z Requires only a fraction of the source volumes capacity

z Multiple snapshots can be created from a source volume and are available immediately

z Snapshots support both read-only and read/write processing

z Supports mainframe and open systems host environments

z Complements TimeFinder and provides unmatched replication flexibility

Save Area

Production view

Snap view

Production volume

Production volume

Virtual Device (VDEV)Pointer Map

TimeFinder/Snap creates space-saving, logical point-in-time images or snapshots. The snapshots are not full copies of data; they are logical images of the original information, based on the time the snapshot was created. Its simply a view into the data. A set of pointers to the source volume data tracks is instantly created upon activation of the snapshot. This set of pointers is addressed as a logical volume and is made accessible to a secondary host that uses the point-in-time image of the underlying data.TimeFinder/Snap supports:

Open and mainframe data volumes Up to 16 concurrent snaps of a single source volume in open systems and eight on mainframe Full function access to the snap; that is, the snap may also be updated with the updates residing in the Save Area.

In many situations, you find yourself trying to support multiple service levels with a single solution. EMC Snap now allows you to complement existing TimeFinder environments, fulfilling multiple service level requirements while balancing the economics of the solutions.




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Creating Logical Point-In-Time Images

z Snap is activated at a set point in time

z Collection of pointers into production data

z Dedicated Save Area for changed data

z Save Area is typically a fraction of source capacity

Production Volume

Production Volume

Application I/O

The Save Area storage pool is a fraction of the capacity of the

standard volumes to be snapped

Track C

Track B

Track A

Production view

Snap view

Persistent, cache-based Pointer Map

Access to snapSave Area

The Production view is a standard view into an active production volume from the hosts perspective. EMC Snap creates the same type of view into your production data at a specific point in time. The cache-resident pointers maintain the point-in-time nature of the snapshot as unchanged data is shared with the Production view and changed data is temporarily collected in the pre-defined Save Area.Best practice for Snap would not require more than 20% of the source volumes capacity in the save area.




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Production Volume

Production Volume

Copy on First Write Overview

First write to Data C;copy on first write is invoked

UpdatedTrack C

Track B

Track A

Snapshot view

z First write to unchanged data performs Copy on First Write

z Preserves the point in time of the snapshot

z Snapshot becomes a combination of pointers to production data and Save Area data

Original Track C

Save AreaSave Area

Production view

TimeFinder/Snap uses a process called Copy on First Write when handling writes to the production data when a snapshot is running.For example, lets say a snapshot is active on the production volume. When a host attempts to write to the data on the production volume, the original Track C is first copied to the Save Area, then the write is processed against the production volume. This process of pointers maintains the consistent, point-in-time copy of the data for the ongoing snapshot.




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Snapshot Consistency

z Enables multiple volumes to be snapped as one logical unit Ensures consistency across

multiple volumesz I/O from host is temporarily

held for all devices in the Symmetrix DMX Dependent write ordering is

maintained Snapshots are activated I/O resumes without

application impact Devices are consistent and

re-startable as a set

HostApplication

Consistent activation enables multiple volumes to be snapped as one,

ensuring consistency

Production Volume

Production Volume

Save Area

When you create a point-in-time image across multiple devices, it is imperative that the entire set of logical volumes be captured at the exact same time. One way to achieve this is to shut down, or totally quiesce, an application so no I/O occurs while you create the sessions. This is obviously a problem in todays application environments.EMC has a solution to this problem. Its called Enginuity Consistency Assist. When you create a set of snapshots and invoke Enginuity Consistency Assist, the Symmetrix will align the I/Os of those devices and halt all I/O from the host systems very brieflymuch faster than the applications can detectwhile it creates the snapshot session. It then resumes normal operation and without any application impact. This ensures write dependency across all devices in the Volume Group.




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How to Perform a Backup with TimeFinder/Snap

Production Volume

Production Volume

Save AreaSave Area

Application I/O

Track C

Track B

Track A

Production view

Snapshot view Access point for backupTrack C

z Backup host will see an image of the volume as it existed at the time of the snapshot

z Will read from both the shared source data and the copy of first write data that resides in the Save Area

z Some I/O contention on the shared source volume

Here is an example of a backup operation from a snapshot. The snapshot gets created, the backup host mounts the snapshot, and performs the backup against the snapshot. It is important to note that the backup runs a sequential read process against the snapshot, so the production application may encounter some performance contention during the backup, due to the fact that the snapshot and the production host are both looking at many of the same spindles for the unchanged data.




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Production Volume

Production Volume

Save AreaSave Area

How to Restore Data with TimeFinder/Snap

Track C

Track B

Track A

Production view

Snapshot view Track C

Restore is incremental to Standardz Supports instant restorez Reducing recovery time objectives

Production I/O Is temporarily paused when restoring directly to the standard

EMC Snap copies Save Areadata back to the standard

Can restore directly toz The source volumez A split BCV of sourcez A separate volume

Here is an example of an incremental restore operation back to the original standard. When the restore is initiated, the host application must be offline so as not to create the potential for data corruption during the restore process. The restore completes after all the collected changed data in the Save Area for that particular snapshot is copied back to the Standard volume.You can also restore to a BCV of the standard when it is in split mode, or to a completely separate volume.




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TimeFinder Commonly used Tools

z EMC Control Center Easy, point-and-click access Excellent for ad hoc TimeFinder operations

z EMC Replication Manager Discovers replication environments Automates replication process Integrates replication technologies at the application level

z TimeFinder/Exchange Integration Module (TimeFinder/EIM) Provides a comprehensive backup management interface specifically for

Windows servers, that support Microsoft Exchange databases residing in Symmetrix storage

Produces exact copies of the production volumes that hold the Exchange server information stores and logs

Full and single mailbox restores in a fraction of the usual timez TimeFinder/SQL Integration Module (TimeFinder/SIM)

Provides a comprehensive backup and recovery management interface specifically for Windows servers, that support Microsoft SQL Server databases

Integrates and collectively automates the command actions and behavioral features

EMC Control CenterThrough the graphical user interface (GUI) within EMC ControlCenter software related devices are grouped together in device groups. TimeFinder operations may be performed on all devices in a device group using a single command, since group information is maintained in the SYMAPI Database.

EMC Replication ManagerWhat this means to EMC customers is that they can now simplify and standardize methods for deploying replications, and replications can be leveraged for a variety of purposes, including backup, testing, recovery, and reporting. Replication Manager is simple, automated and open.It is simple because Replication Manager is one application that automates, simplifies, and manages disk-based replications. The application provides a layer of transparency to underlying technology complexity. It insulates the user from the storage environment, replication software being used, the type of server, the operating system, disk volumes, etc.

TimeFinder/Exchange Integration Module (TimeFinder/EIM)TimeFinder/EIM provides a comprehensive backup management interface specifically for Windows servers that support Microsoft Exchange databases residing in Symmetrix storage. Using the TimeFinder/EIM software produces exact copies of the production volumes, that hold the Exchange server information stores and logs. This enables Exchange administrators to perform both full- and single- mailbox restores in a fraction of the usual time.

TimeFinder/SQL Integration Module (TimeFinder/SIM)TimeFinder/SIM provides a comprehensive backup and recovery management interface specifically for Windows servers that support Microsoft SQL Server databases. TimeFinder/SIM integrates and collectively automates the command actions and behavioral features of EMC TimeFinder, SRDF, and the tools supplied with Microsoft SQL Server 2000 products.




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Accessing TimeFinder via Solutions Enabler

z Solutions Enabler TimeFinder Feature Based on SYMAPI Consistent command syntax Functions implemented using binary commands Used for Job Control Language on mainframes and scripting

on Open Systemsz Device Groups

A collection of devices, assigned to a named group, to provide a more manageable object to query status and impart control operations

Devices can be associated as either a device group or a composite group

Solutions Enabler allows access through the command line interface (CLI ). Automation for Mainframes can occur through job steps in the Job Control Language and through Open Systems scripting.A collection of devices can be assigned to a named group to provide a more manageable object to query status and impart control operations. Groups can be used to identify and work with a subset of available Symmetrix devices, obtain configuration, status, and performance statistics on a collection of related devices, or issue control operations that apply to all devices in the specified device group.




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Group Types

z Device Group (DG) A user-defined group comprised of devices that

belong to a single Symmetrix array a single RDF (RA) group

Control operations can be performed on the group as a whole, or on the individual device pairs that comprise it

z Composite Group (CG) A user-defined group comprised of devices that

belong to one or more locally-attached Symmetrix arrays one or more RDF (RA) groups within a Symmetrix.

Control operations can only be performed on the group as a whole

A device group (DG) is a user-defined group comprised of devices that belong to a single Symmetrix array and a single RDF (RA) group. A control operation can be performed on the group as a whole, or on the individual device pairs that comprise it.A composite group (CG) is a user-defined group comprised of devices that can belong to one or more locally-attached Symmetrix arrays, and one or more RDF (RA) groups within a Symmetrix. However, composite groups are limited by the fact that control operations can only be performed on the group as a whole.




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Group Name Services

z Provides the optional ability to store device and composite group definitions in a shared repository on each Symmetrix array

z Automatically become visible to all locally attached hosts

z Allows all GNS-enabled hosts to see the same group definitions across the Symmetrix environment

z Shares real-time updates to group definitions and configurations made by other hosts

Host

Host

Host

RepositoryRepository

In a default Symmetrix environment, device group and composite group definitions are created via a locally attached host. Upon creation, the group definition is stored in the hosts configuration database file. Therefore, only the host that created the group would see the group and control it. To perform control operations from another locally attached host, the group definition would have to be manually copied to other hosts. Optionally, you could enable the Group Name Services (GNS) option on your Symmetrix-based hosts. GNS provides the optional ability to store device and composite group definitions in a shared repository located on each Symmetrix array, which would then automatically become visible to all locally attached hosts. This allows all GNS-enabled hosts to see the same group definitions across your Symmetrix environment, while sharing real-time updates to group definitions and configurations made by other hosts.




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Course Summary

Key Points covered in this course:z Functional concepts of TimeFinder z Benefits of TimeFinder z Differences between the various TimeFinder Replication

Solutions

Key points that were covered in this course are shown here. Please take a moment to review them.




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Closing Slide

Thank you for your attention. This ends our training on TimeFinder Foundations.

Introduction to Enterprise Business ContinuityAudio Portion of this CourseEMC Technology FoundationsCourse ObjectivesWhat is Business Continuity?Why Business Continuity?Business Continuity Obstacles of AvailabilityCost of Downtime Per Hour By IndustryBusiness Continuity Starts with Data ProtectionData Protection with Disk MirroringMultiple Mirrors - Multiple UsesEMC Business Continuity Solution ChoicesBusiness Continuity is a Core EMC CompetencyCourse SummaryTimeFinder FoundationsAudio Portion of this CourseEMC Technology FoundationsTimeFinder FoundationsThe TimeFinder Product FamilyTimeFinder/Mirror - BCVsBusiness Continuance VolumesProtected BCV DevicesSRDF Protected BCV DevicesMulti-BCVsConcurrent BCVsTimeFinder/Mirror - BCV OperationsBusiness Continuance VolumesSplitting a BCVConsistent SplitReverse SplitPowerPath and ECA Consistent SplitsRe-establishing a BCV PairRestoring from a BCVSample TimeFinder/Mirror - BCV OperationTimeFinder/CloneTimeFinder/CloneCopy On AccessRestoring from a CloneTimeFinder/SNAPTimeFinder/Snap for Symmetrix DMXCreating Logical Point-In-Time ImagesCopy on First Write OverviewSnapshot ConsistencyHow to Perform a Backup with TimeFinder/SnapHow to Restore Data with TimeFinder/SnapTimeFinder Commonly used ToolsAccessing TimeFinder via Solutions EnablerGroup TypesGroup Name ServicesCourse SummaryClosing Slide

Documents

Time Finder