August _ 2014 _ Ahmad Sabry ElGendi _ Page 4

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Ahmad Sabry ElGendi ~ Sharing My notes

Monthly Archives: August 2014

Some Data Domain Maximums !

10 Sunday Aug 2014

POSTED BY AHMAD SABRY IN E20-385, EMC

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Maximum Number of Supported Inodes#

An NFS or CIFS client request causes a Data Domain system to report a capacity of about twobillion inodes (files and directories). A Data Domain system can exceed that number, but thereporting on the client may be incorrect.

Maximum Path Name Length#The maximum length of a full path name (including the characters in /data/col1/backup) is 1023bytes. The maximum length of a symbolic link is also 1023 bytes.

Max Support Bundles#The system supports a maximum of 10 support bundles. If you attempt to generate an 11thsupport bundle, DD System Manager displays a warning that prompts you to click OK or Cancel.If you click OK to continue, the oldest support bundle, which is listed in the warning message, isdeleted.

Maximum Days Between Change#The maximum number of days between password changes that you allow a user. Default is 99999.

Managing HTTP and HTTPS Access(System ports and session timeout values)#In the Session Timeout text entry box, enter the interval in seconds that must elapse beforeconnection closes. The minimum is 60 seconds and the maximum is 31536000 seconds (one year).

Virtual Interfaces#The virtual-name must be in the form vethx where x is a number. The recommended maximumnumber is 99 because of name size limitations.

MTU Size#

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MTU Size#Although 9000 is the maximum size, to be backwardly compatible, the DD OS accepts up to 9014,but sets the size to 9000 when it is greater than 9000 and less than or equal to 9014.

Upgrade Packages#A maximum of 5 upgrade packages can be uploaded using DD System Manager. To continuewith this procedure, remove the excess images (see Removing an Upgrade.

This table recommends the maximum number of systems and user sessions that can bemanaged by DD System Manager#

Maximum Initiators#An access group may contain multiple initiators (a maximum of 128), but an initiator can exist inonly one access group. A maximum of 512 initiators can be configured for a Data Domain system.

Maximum Groups#

When you create or configure an access group on a Data Domain system, each Data Domainsystem device (media changer or drive) can be assigned to multiple groups. Devices assigned toother groups, however, cannot be assigned to TapeServer. A maximum of 128 groups can becreated.

Maximum LUNs #

The maximum LUN accepted when creating an access group is 16383. A LUN can be used onlyonce for an individual group. The same LUN can be used

with multiple groups.

Maximum Libraries#VTL supports a maximum of 64 libraries per system (that is, 64 concurrently active virtual tapelibrary instances on each Data Domain system).

CAPs Maximum#

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CAPs Maximum#CAPs (cartridge access ports) – VTL supports a maximum of:-100 CAPs per library-1000 CAPs per system

Slots Maximum:Slots – VTL supports a maximum of:– 32,000 slots per library– 64,000 slots per system

I/O Maximum#The maximum supported I/O size for any Data Domain system using the VTL is 1 MB.

Maximum Snapshots#The maximum number of snapshots allowed per MTree is 750. Warnings are sent when thenumber of snapshots per MTree reaches 90% of the maximum allowed number (from 675 to 749snapshots), and an alert is generated when the maximum number is reached.To clear the warning,expire snapshots and then run the file system cleaning operation.

Number of Streams Supported:Each optimized synthetic backup accounts for two streams: one write and one read stream. Therefore, the maximum number of concurrent streams for thesynthetic backup cannot exceed half of the total streams supported for the Data Domainsystem.

Retention Period: Specifying a minimum retention period of less than 12 hours, or amaximum retention period longer than 70 years, results in an error.

Quota: MTree quotas apply to ingest operations. These quotas can be applied to data on




systems that have the DD Extended Retention software, regardless of which tier it resides on;as well as VTL, DD Boost, CIFS, and NFS.Snapshots are not counted. Quota cannot be set on the /data/col1/backup directory.The maximum quota value allowed is 4096 PiB.

Data Domain Supports up to 180 source appliances to one target device.Each Data Domain system model supports a maximum number of simultaneous connections.To NetWorker this translates to the number of streams as part of the parallelism settings. Donot exceed server parallelism for the allowable Data Domain model’s max streams. If thisnumber is exceeded, performance degradation can occur.Use the net show hardware command to see how many interfaces are configured and at whatspeed they are connected# net show hardwarePort Speed Duplex Supp Speeds Hardware Address Physical Link Status—- ——– ——- ———– —————– ——– ———–eth0 1000Mb/s full 10/100/1000 00:23:8b:57:77:5f Copper yeseth1 1000Mb/s full 10/100/1000 00:23:8b:57:77:60 Copper yes—- ——– ——- ———– —————– ——– ———–In the above example both the interfaces eth0 and eth1 are connected (Link Status “yes”), thespeed of each is 1000 mega-bits per second and the duplex setting is full. In this example, themaximum throughput for any single interface is 125 mega-bytes per second; and thetheoretical maximum transfer speed for this data domain system is 250 mega-bytes per secondin each direction.From <https://emc–c.na5.visual.force.com/apex/KB_BreakFix_1?id=kA1700000000tP3>

Memory considerations:

The Target sessions attribute refers to the optimal number of backup sessions accepted by anyactive NetWorker device. If a device has a Target session setting of 4, NetWorker will look foranother available device when, say, a fifth stream is started.

If no device is available the target sessions setting will be ignored and the extra stream will getadded to the initial four on the original device. The Max session setting determines the absolutemaximum number of streams a device will allow. The Max session is a hard limit and the Targetsession a soft limit. The default setting for

the Data Domain device Target session is 1 and the Default Max session is set to 4, with an overallhard limit of 10.

Each read-write device (active nsrmmd process) that takes one save stream requires 48 MB ofRAM on the storage node. Each additional save stream requires 16 MB. The corresponding read-only device requires 16 MB, regardless of the number of save streams. Thus one save stream

https://emc--c.na5.visual.force.com/apex/KB_BreakFix_1?id=kA1700000000tP3



requires 64 MB, four save streams require 128 MB,and the maximum of 10 save streams requires224 MB.

It is recommended that no more than 16 Data Domain device types reside on a storage node thatis running the maximum number of 10 save streams per device.

This scenario would require (16 x 224) = 3.6 GB of physical memory on the storage node. It is recommended that a storage node have at least 8 GB of RAM when hosting NetWorker DataDomain devices. The use of two interface connections (1 GbE or 10 GbE) is also highlyrecommended.

To determine the amount of memory needed for your particular deployment, use the followingformula as a guideline:

m=n ((16*s)+64)

Where m= Memory requirements in MB, n= Number of DD devices, s= Max sessions

Data Domain Licensed Features

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EMC Data Domain Boost#

Enables the use of a Data Domain system with the following applications: EMC Avamar, EMCNetWorker, Oracle RMAN, Quest vRanger, Symantec Veritas NetBackup (NBU), and BackupExec. The managed replication feature of DD Boost also requires the DD Replicator license.

EMC Data Domain Encryption#Allows data on system drives or external storage to be encrypted while being saved, and thenlocked before moving it to another location.

EMC Data Domain Expansion Storage#Allows external shelves to be added to the Data Domain system for additional capacity.

EMC Data Domain Shelf Capacity#Enables a Data Domain system to expand the active tier storage capacity beyond the entrycapacity defined for that system.

EMC Data Domain Extended Retention (formerly DD Archiver) #

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EMC Data Domain Extended Retention (formerly DD Archiver) #Licenses the Extended Retention storage feature.

EMC Data Domain ArchiveStore#Licenses Data Domain systems for archive use, such as file and email archiving, file tiering, andcontent and database archiving.

EMC Data Domain I/OS (for IBM i operating environments)#An I/OS license is required when VTL is used to backup systems in the IBM i operatingenvironment. Apply this license before adding virtual tape drives to libraries.

EMC Data Domain Virtual Tape Library (VTL)#Enables the use of a Data Domain system as a virtual tape library over a Fibre Channel network.

EMC Data Domain NDMP Tape Server#Enables the use of a Data Domain system as a virtual tape library that supports backups of NASdevices over Ethernet/IP networks.

EMC Data Domain Replicator#Adds DD Replicator for replication of data from one Data Domain system to another. A license isrequired on each system.

EMC Data Domain Retention Lock Compliance Edition#Meets the strictest data retention requirements from regulatory standards such as SEC17a-4.

EMC Data Domain Retention Lock Governance Edition#Protects selected files from modification and deletion before a specified retention period hasexpired.

Gateway Expanded Storage Level 2#Enables gateway systems to support additional usable capacity.

Gateway Expanded Storage Level 3#Enables gateway systems to support additional capacity greater than Expanded Storage Level 2usable capacity.

–

Adding License to Data Domain:

System settings -> Licenses ->Add licenses

By Commands:

license add CDEF-FEDC-CCDD-EEFF BBCC-DDAA-CCAB-AADD- DCCBBDAC-E5

Added “CDEF-FEDC-CCDD-EEFF” : REPLICATION feature

Added “BBCC-DDAA-CCAB-AADD-DCCB-BDAC-E5” : CAPACITY ARCHIVE feature for 7TiB



Added “BBCC-DDAA-CCAB-AADD-DCCB-BDAC-E5” : CAPACITY ARCHIVE feature for 7TiBcapacity ES3O

license add <license-code> [<license-code> ...]

license del <license-feature> [< license-feature> ...] | <license-code> [<license-code> ...]

license reset

–

Adding License to Data Domain:

System settings -> Licenses ->Add licenses

By Commands:

license add CDEF-FEDC-CCDD-EEFF BBCC-DDAA-CCAB-AADD- DCCBBDAC-E5

Added “CDEF-FEDC-CCDD-EEFF” : REPLICATION feature

Added “BBCC-DDAA-CCAB-AADD-DCCB-BDAC-E5” : CAPACITY ARCHIVE feature for 7TiBcapacity ES3O

license add <license-code> [<license-code> ...]

license del <license-feature> [< license-feature> ...] | <license-code> [<license-code> ...]

license reset

E20-385 Quick notes

08 Friday Aug 2014


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If you experience system performance concerns, like:

· Exceeding your backup window,

· If throughput appears to be slower than expected

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Consider the following:

1. Check the Streams columns of thesystem show performance commandto make sure that the system is not exceeding the recommended write and read stream count.

2. Look specifically under rd (active read streams) and wr (active write streams) to determine thestream count. Compare this to the recommended number of streams allowed for your system.

3. If you are unsure about the recommended streams number, contact Data Domain Support forassistance.

–

Distributed segment processing (DSP):

An optional feature to DD Boost shares the deduplication process with the application host. Theapplication host performs a comparison of the data to be backed up with its library and seeks andsends only unique data segments to the Data Domain system, thus improving data throughputand reducing load on the Data Domain system.

–

An EMC Data Domain customer has 1 TiB of data for their initial backup. They estimate a 10percent change rate in the data each day.

Assuming the compression rate of the initial backup is 5x and the compression rate of eachincremental backup is 10x, how much space is needed for the initial backup and six incrementalbackups?

Intital

1 TB

5 X compression

=è 200 GB

Incr:

10% change each day

10 X compression

============ 100GB @ 10X======== 10 GB

Required:

1- Space for initial + 6 Incremental



260 GB

–

A customer is interested in deploying DD Boost for their current EMC Data Domain system. Theyare aware of Distributed Segment Processing (DSP) and want to know the data flow when theyenable DSP.

What describes the data flow from the backup host to the Data Domain system?

Segmenting, fingerprinting, fingerprint filtering, and compression occur on the backuphost.Writes occur on the Data Domain.

Segmenting, fingerprinting, and fingerprint filtering occur on the backup host.Compressionand writes occur on the Data Domain.

Fingerprinting, compression, and fingerprint filtering occur on the backup host.Segmentingand writes occur on the Data Domain.

Segmenting, fingerprinting, and compression occur on the backup host.Fingerprint filteringand writes occur on the Data Domain.

Answer#Segmenting, fingerprinting, and compression occur on the backup host.

Fingerprint filtering and writes occur on the Data Domain.

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What is the correct sequence of the SISL data flow in an EMC Data Domain system?

Create segments

Create fingerprints

Verify if segments are unique

Store unique segments

Data stream enters RAM1. Data stream enters RAM

2. Create segments

3. Create fingerprints

4. Verify if segments are unique

5. Store unique segments

–

When installing a new EMC Data Domain system with the Extended Retention software, what isthe correct sequence of installation steps?

1. Install the hardware

2. Define the Data Domain system information for the site

3. Perform the initial system configuration

4. Configure the system for data access

5. Configure the optional software

6. Perform the optional additional system configuration

–

An organization currently writes backups to an EMC Data Domain system and then createsencrypted copies of their backups on tapes. These tapes are then shipped to a third-party offsitevault.




They are now planning to deploy a second Data Domain system to a data center at their corporateheadquarters as a replication target to replace the use of the offsite tapes. The two sites areconnected through a secure connection.

Where should encryption be applied on the Data Domain systems to ensure a similar level of datasecurity as achieved by their current process?

Encrypt the data at rest at the destination site

Encrypt the replication context

Encryption is not required

Encrypt the data at rest at the source siteAnswer#

Encrypt the data at rest at the destination site

There are two types of encryption:

1. Encryption for data in flight means encryption as data is transported. Only at the source and thedestination is the data’s true meaning apparent.

2. Encryption for data at rest involves data that is physically stored in an encrypted manner, suchthat the data can be removed or copied and taken to another environment. It cannot be accessedwithout decrypting it.

–

NetBackup storage lifecycle policies provide the ideal vehicle for initial backups as well as theability to create duplicate backup images. Storage lifecycle policy duplication tasks initiateoptimized duplication jobs on OpenStorage storage units. Consider the following:

–

When setting the MTU size for an Ethernet interface on an EMC Data Domain system, what is themaximum supported value?

1500

2048

90009014

Answer#9014Supported values are from 350 to 9014. For 100 Base-T and gigabit networks, 1500 is the standarddefault.

–



A customer is configuring Symantec NetBackup with an EMC Data Domain system. What isrequired before DD Boost can be used?

Restart the Symantec NetBackup server

Download and install the plug-in on the media server

Download and install the plug-in on the master server

Restart the Data Domain file systemDD Boost for NetBackup has two components.

1. The DD Boost Library is embedded in the OpenStorageplug-in that runs on NetBackup media servers.

2. The DD Boost Server is built into DD OS 4.8 or later and runs on a Data Domain system. Thetwo components integrate seainlessly across the IT infrastructure to enable theses benefits.

Answer#

Download and install the plug-in on the media server

–

Which port(s) on the expansion shelf should the HBA port be connected to on an EMC DataDomain controller?

Expansion port

BMC port

Host or expansion ports

Host portAnswer#Host port

Here’s a picture of a Data Domain controller with two expansion shelves.There are somegeneral cabling rules. Let’s review them.

First, The Data Domain controller HBA port should always connect to the Host port of anExpansion Shelf.

In other words, the HOST port on the Expansion Shelf connects upstream to the Data DomainController.

Second, the expansion port on the Expansion Shelf is used to connect downstream to anotherexpansion shelf

And Third, the expansion port on the last shelf should be empty. It does not connect back tothe Data Domain controller.

–



Refer to the Graphic.

When did the last file system cleaning operation occur on the EMC Data Domain system?

Feb 26

Feb 27

March 3

March 5Answer# March 5

The lines of the graph show measurements for:

Capacity (not shown) —

The total amount of disk storage available for data on the Data

Domain system. The amount is shown on the Space Used (left) vertical axis of the graph.

Clicking the Capacity checkbox changes the view of space between GiB and TiB. The

capacity on the example system is 7.5 TiB and does not show the capacity line in this

smaller view.

Post-comp (as shown in the larger shaded area in the graph) —

The total amount of disk storage in use on the Data Domain system. This is shown with theSpace Used (left) vertical axis of the graph.

Comp Factor (as shown in the slide as a single black line on the graph) —

The amount of compression the Data Domain system has performed with the data it received(compression ratio). This is shown on the Compression Factor (right) vertical axis of the graph.

Cleaning —

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A grey vertical line appears on the graph each time a file system cleaning operation wasstarted. Roll over a data line representing cleaning to see the date and time cleaning wasstarted and the duration of the process.

Data Movement (not shown) —

The amount of disk space moved to the archiving storage

area (if the Archive license is enabled).

–

A customer is preparing their site for the installation of an EMC Data Domain DD990 and fourES30 expansion shelves. How many rack units (RU) are required for the installation?

14

15

16

18Expansion Shelves are 3 U size

DD990 is 4 U size

Answer# 16

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A customer has a backup environment using EMC NetWorker with an EMC Data Domainsystem. What is the correct sequence of steps to implement DD Boost in this environment?

· Create a Storage Unit

· Set up DD Boost User

· Configure a Data Domain device with a backup pool

· Enable DD Boost

1. Set up DD Boost User.

2. Enable DD Boost.

3. Create a Storage Unit

4. Configure a Data Domain device with a backup pool

In this exercise, you prepare the Data Domain systems for integration with the backup



In this exercise, you prepare the Data Domain systems for integration with the backupenvironment enabled for DO Boost. On the Data Domain system, you log into the CU as an

administrative user as shown. Verify that the file system is enabled and running by entering: #filesys status

The results show that the file system is enabled and running. Add the DO Boost license usingthe license key that Data Domain provided. For this exercise, type:# license add ABCD-DCBA.

AABB-CCDD

The license has been added.Establish the DD Boost username and password for the DataDomain system. Note that only one user can be configured for DO Boost access on a Data

Domain system at any time. First add a user by typing:# user add boostadmin password abcl23

Now type:# ddboost set user•name boostadmin

Now enter:# ddboost enable

Enable users to monitor backup events captured by SNMP traps and add hosts to receive theSNMP traps. add a community string of public with read-only permissions by entering:#

snmp add ro-community public

Confirm the addition by entering “y” for “yes.”

Now enter:# snmp enable

Add the host to receive traps depending on the site configuration. For this exercise, enter:snmpadd trap-host adminl2 version v2c community public

Now you can create one or more storage units on each Data Domain system that will be usedwith the backup management software. Note that when integrating with NetWorker, this

step can be performed automatically using the NetWorker Device Configuration wizard. Eachstorage unit name on a single Data Domain system must be unique. However, when

performing file replication, the storage unit name on the two Data Domain systems used in thereplication must be the same. On the Data Domain system, enter:# ddboost storage-unit

create storage_unit_examplel

Repeat the last step for each Boost-enabled Data Domain system. Congratulations, yousuccessfully prepared the Data Domain systems for integration with the backup environment

enabled for DO Boost.

This exercise covers steps for preparing NetBackup to perform backups to Data Domain



This exercise covers steps for preparing NetBackup to perform backups to Data DomainSystems with DO Boost, Including configuring Disk Storage Servers, and creating a Storage

Lifecycle Policy. Prior to these steps, you should have performed procedures to prepare boththe source and target Data Domain Systems for DO Boost. You will configure both DD Boost

Data Domain systems as Disk Storage Servers, performing these steps twice. To begin, afteropening the NetBackup administration console, select Configure Disk Storage Servers to

launch the wizard.

To select the type of disk storage to configure, choose OpenStorage from the menu.

Choose Open Storage.

Click Next.

Normally you type in the details shown here for the Data Domain backup OD Boost server.We’ve entered the details for you to save time. Click Next to continue.

Click Next.

The progress is shown here, and indicates completion. Click Next.

The storage server was successfully created. Click Next to continue with disk pool creation.

Click Next.

Select OpenStorage (Data Domain) in the list box.

Click Next.

Select the dddev-03 DO Boost backup Data Domain system in the list box.

Click Next.

Select the OST Backup volume, then click Next.

Click Next.

Name the disk pool by entering: OSTBackupPool

Click Next.

A summary is provided here. Click Next to start the disk pool creation.

The status pane shows that the configuration is completed. Click Next.

Click Next.



Name the storage unit by entering: OSTBackup

Click Next.

Click Finish.

–

What is the purpose of the NDMP tape server function on an EMC Data Domain system?

Enables VTL backup for backup hosts through Ethernet

Enables VTL backup for NAS systems through Fibre Channel

Enables VTL backup for backup hosts through Fibre Channel

Enables VTL backup for NAS systems through Ethernet

Answer# Enables VTL backup for NAS systems through EthernetWhen configuring an NDMP over TCP/IP configuration, a Data Domain system starts anNDMPtape server. NDMPtape servers are accessed via a standard NDMP protocol.

The host server must have NDMP client software installed and running. This client software isused to remotely access the Data Domain VTL.

Devices assigned to the access group TapeServer on the Data Domain system can be accessedonly by the NDMP TapeServer

The NDMP tape server on the Data Domain system converts this data to tape I/O, and writes tothe Data Domain VTL.

–

42.

A customer is purchasing an EMC Data Domain system pre-installed in a Data Domain rack.The data center requires that the system be powered from multiple existing AC power sourcesfor redundancy.

What must be done to enable the rack to draw power from redundant AC sources?

An additional PDU needs to be ordered and installed for power redundancy

A second PDP set needs to be ordered and installed for power redundancy

The second PDP set must be attached within the rack for power redundancy

The rack comes with two PDPs installed, ready for power redundancyAnswer#

The second PDP set must be attached within the rack for power redundancy



Power Distribution Panel (PDP)

Data Domain Rack consists of dual redundant power distribution panels (PDP)

Each system is supplied by 1st set of PDPs

The 2nd set of PDPs is installed, but not attached

Adding the 2nd PDP doubles the power available to the rack, however, additional

building AC circuits are required to plug into the 2nd set of PDP’s

The PDPs are connected to the external power mains through power cords

Power Distribution Unit (P DU)

. Power Distribution Units (PDU) are connected to the PDPs mounted within the

cabinet

The shelves and system controllers are plugged into the PDU

–

46.

Which backup software products include the EMC DD Boost libraries?

Dell vRanger 5.4, EMC NetWorker 8.0 and Avamar 7.0

EMC Avamar 7.0, Symantec Backup Exec 14.0, and Oracle RMAN 11.2

Oracle RMAN 11.2, Symantec NetBackup 7.6 and Backup Exec 14.0

EMC NetWorker 8.0, Symantec NetBackup 7.6, and Dell vRanger 5.4

Answer# Dell vRanger 5.4, EMC NetWorker 8.0 and Avamar 7.0For EMC, Oracle, and Quest users, the Data Domain Boost library is already included in recent

versions of software. Before enabling DD Boost on Symantec Backup Exec, and NetBackup, aspecial

OST plug-in must be downloaded and installed on the backup host. The plug-in contains the

appropriate DD Boost Library for use with compatible Symantec product versions. Consult themost

current DD Boost Compatibility Guide to verify compatibility with your specific software andData

Domain operating system versions. Both the compatibility guide and versions of OpenStorage



Domain operating system versions. Both the compatibility guide and versions of OpenStorage(OST)

plug-in software are available through the Data Domain support portal at:

http://my.datadomain.com.

–

49.

Which link aggregation methods are supported on an EMC Data Domain system?

LACP, Balance-rr, and Failover

LACP, Broadcast, and Round Robin

LACP, Balance-xor, and Round Robin

LACP, Balance-xor, and FailoverAnswer#

LACP, Balance-xor, and Round Robin

A Data Domain system supports two aggregation methods: round robin and balance-xor (youset it up

manually on both sides).

–

50.

Where can the system serial number be verified in EMC Data Domain System Manager?

Maintenance tab

System Settings tab

Status tab

Hardware tabAnswer#

Maintenance tab

After your Data Domain system is installed, you should verify that you have the correct modelnumber, DD OS

version, and serial number to ensure that they match what you ordered. The System page in theSystem

http://my.datadomain.com/



Manager gives you important system information without requiring you to enter multiplecommands.

To verify your model number, system uptime, and serial number in the System Manager:

1. Click the Maintenance tab.

2. Verify the model number, DD OS version, system uptime, and serial number.

–

53.

Refer to the Graphic.

When implementing an EMC Data Domain system at a customer site, you notice that Post-Comp plotting is not visible. What could be the reason for this behavior?

Full system capacity is displayed

Pre-encrypted data was written to the Data Domain system

No data was written to the Data Domain system

Shelf Capacity license was not installedAnswer#

Full system capacity is displayed

Data reduction factors depend on the type of data being backed up. Some types of challenging(deduplication-unfriendly) data types include:

. pre-compressed (multimedia, .mp3, .zip, and .jpg)

. pre-encrypted data

–




54.

What is indicated by a slow blinking blue LED on a disk in an EMC Data Domain DD2500system?

Drive is powered up but is not handling I/O activity

Drive is faulty and should be replaced

Drive is powered up, spinning, and handling I/O

Drive in the expansion shelf and DD appliance are establishing a connectionAnswer#

Drive is powered up but is not handling I/O activity

Blue: normal Blue blinking: drive activity Amber: drive fault

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