CML Mod05 SizingDesignConfiguration RELEASE v3

7/28/2019 CML Mod05 SizingDesignConfiguration RELEASE v3

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Dell CompellentModule 5: Storage Center Sizing, Design and Configuration


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Sizing, Design and Configuration Objectives Discuss solution sizing considerations for IOPs, capacity mix of

storage tiers, Useable capacity, RAID levels and types of disks.

Design considerations for the entire application andinfrastructure

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SizingConsiderations

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Performance Analysis and Technical RelationshipThe majority of storage consumers do not understand their

storage performance requirements

This process is not just about the gathering the technical requirementsand defining the underlying technical requirements, but provides:

Opportunity to prove technical credibility

Opportunity to help customer better understand their environment

Gain Trusted Advisor status

Built-in follow-up meetings

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What Is Good Design? Good design considers the entire application and infrastructure

What application(s) will use the storage system?

What is the IO pattern for the applications? Does the application vendor have published sizing data?

Does the current SAN, LAN, WAN infrastructure have the capacity for thestorage system(s)

Customer considerations and requirements What are they trying to accomplish?

Are there other future projects that have not been addressed?

Do not design to the edge of functionality

Know where the limitations are and stay within those limitations

Design to over-deliver, not to underwhelm

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Solution Sizing Considerations - Performance Performance

Understand all Server IOPs that will attach to the SAN

Remember all Volumes are sharing all disk resources

Understand both IO and bandwidth requirements

Performance Collection and Analysis

Technical involvement at this stage is crucial to understand

Design for Customers actual requirements and not perceivedrequirements

Very creditable way to engage with the prospect

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Solution Sizing ConsiderationsUsable CapacityUsable capacity requirements

What is presented to servers

Full Backups a good indicator of required capacity Plus RAID overhead, Plus Replay overhead

What is the Replay retention policy?

Understand data growth requirements

Proportion of Active / Inactive Data Determines capacity mix of storage tiers

Recovery Point?

Understand backup and RPO / RTO requirements

Remote Instant Replay or Live Volume?

Geographic / latency limitations

Cost

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Solution Sizing Considerations - IOPS IOPS

Understand all servers IOPs that will attach to SAN

Granular log gathering 3 second internals show peak durationsand provides a number for sustained IO that needs to be deliveredfrom disk

Storage Center Read/Write Cache will process peak burst IO

Generation of system sustained IOPs requirement = No. of initialT1 spindles

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Solution Sizing ConsiderationsBandwidth Bandwidth

Bandwidth for most environments is not a concern as todays connectivitytechnologies are rather high bandwidth. However it does need to beconsidered for specific applications and environments (streaming data /backup targets

Understand all servers bandwidth requirements

Bandwidth (KB/s)= IOPs x Block size (KB)

Determines number and type (FC, iSCSI or FCoE) of FE ports

Determines number and depth of BE chains / loops

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Solution Sizing Considerations - RAID Overhead RAID 10 Best for write IO

RAID10 2D+2M 100% RAID overhead, needs minimum of 2 active spindles inthe Tier but four is best.

RAID 5 As good as RAID 10 for reads

2 types of RAID 5:

RAID5-5 20% RAID overhead , needs minimum of 5 active spindles in the Tier

RAID5-9 11% RAID overhead, needs minimum of 9 active spindles in the Tier

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Solution Sizing Considerations - RAID Overhead RAID 6 Recommended for 7K drives 1TB and over

Dual drive failure protection

RAID6-6 33% RAID overhead , needs minimum of 6 active spindles in the Tier

RAID6-10 20% RAID overhead, needs minimum of 10 active spindles in the Tier

Compellents Dynamic RAID automatically moves datacontained in a Replay from R10 to R5 to improve usable

capacity while maintaining performance Blend R10 & R5_9 in Tier 1 (20% of T1 data R10 and 80% at R5_9)

Generally use 24% overall overhead

Use R6 in T3

Generally use 20% overhead, assuming R6-10

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Hard Drive Characteristics Drive rules of thumb

SSD = 2500 IOPS

15K = 170 IOPS

10K = 120 IOPS

7.2K = 80 IOPS

Are these hard numbers? NO!

General best practice - design for the peak IOP number, notthe average

Remember that RAID takes IOPS

Determine performance needed then add 20%

Determine capacity needed, then add 20%

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Solution Sizing Considerations SSD

SSD

High performance - High price

Low latency - Low capacity

Requires a different form of value discussion

Must shift the discussion from cost-per-GB to cost-per-IO

Current SSD Technology is based on STEC Single Level Cell (SLC) drives

FC - 146GB Capacity

SAS - 200GB Capacity

~2500 IOPs depending on IO workload

Best suited for small block workload

Minimum configurations

3 Drives - 2 Active drives with R10 and 1 Hot Spare 5 Drives - 4 Active drives with R10 and 1 Hot Spare

6 Drives - 5 Active drives with R5-5 and 1 Hot Spare

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Solution Sizing Considerations T1 Capacity

SizeWhen sizing a tiered system, the total capacity will be balanced

between the tiers of storage

Generally 30% Active usable capacity is a safe number

Example:

10TB solution would require 3TB for active data in T1 and 7TBfor inactive data in T3, but T1 must meet IO requirement

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Type Advertised GB Useable GB I/F RPM P/N T1 IOPS

1 73 68 FC, 4Gbps 15K DS-F4-73X15K 177

2 146 136 FC, 2Gbps 10K DS-F146X10K 1273 146 136 FC, 2Gbps 15K DS-F146X15K 177

4 146 136 FC, 4Gbps 15K DS-F4-146X15K 177

5 300 279 FC, 2Gbps 10K DS-F300X10K 127

6 300 279 FC, 4Gbps 10K DS-F4-300X10K 144

7 300 279 FC, 4Gbps 15K DS-F4-300X15K 177

8 300 279 FC, 4Gbps 15K DS-F4-300X15K6 180

9 400 372 FC, 4Gbps 10K DS-F4-400X10K 144

10 450 419 FC, 4Gbps 15K DS-F4-450X15K6 180

11 500 465 SATA, 2Gbps 7.2K DS-S500X7K2 77

12 750 697 SATA, 2Gbps 7.2K DS-S750X7K2 77

13 1000 930 SATA, 2Gbps 7.2K DS-S1000X7K2 77

Compellent Disk Calculator

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Solution Sizing Considerations T1 Capacity

Size Decide on proportion of Active/Inactive data set

Numbers to Consider

File Servers 5% Active/95% Inactive

Email Servers 40% Active/60% Inactive

Databases subject to usage

Generally 30% Active is a safe number, but if large amount ofunstructured data, then 20% can be used.

Dictates drive size used in tiers

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Solution Sizing Considerations Usable Capacity Storage allocated to servers

Storage allocated but unused

Actual data stored

Full backups a good indicator as an approximation

File system statistics provide the best analysis

Understand the RAID levels applied to raw capacity to understand theusable capacity

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System Feature Considerations Consider performance and capacity overhead

Functionality has a cost

The Compellent cost is much lower than most

Are they using Data Progression? What is the 24 hour IO window?

Are they using Data Instant Replay? What is their data change rate?

How many replays will they be keeping and for how long?

Have you included this capacity in your design

Are they using Remote Instant Replay? RTO, RPO, distance, latency, async, sync

Are they using Live Volume? Application considerations, distance, latency

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Design a Solution


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Design a Solution Start with IOPS

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What We Know Design a system to meet the following needs:

View performance analysis information provided (15000 IOPs)

Total Usable Capacity = 75TB

User reports 10% Active Data and 90% Historical Data

Redundancy is a primary concern to the customer

20 Servers will use Dual Fibre Channel for connectivity

A DR system is desired 8 Servers will be connected

All Data will be Replicated to the DR site via iSCSI

Replays will account for 20%

User needs to be able to recover missing files or corrupt volumes quickly

User is running Oracle, SQL, and Exchange 2007

Mailbox size limit is 1GB 1500 Users

User has indicated a desire to do reporting and long term trending

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Compellent Design - Software Primary System

Software

Storage Center Core Dynamic Capacity

Cluster Controllers

Data Instant Replay

Data Progression

Remote Instant Replay

Replay Manager

Enterprise Manager

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Compellent Design Performance Tier 1 with

3.5 SAS Tier 1 = 15,000 IOPS

15,000 IOPS / 170 IOPS per 15K Spindle = 89 Active 15K Spindles

Total IOPS divided by IOPS per drive = total active spindles needed

89 Spindles / 11 Active SAS15K Spindles per Enclosure = 8 SAS 3.5"12 Bay Enclosures

Active spindles divided by total spindles in an enclosure

Additional drives to compensate for Hot Spares = 9 total enclosures

Each enclosure must have one hot spare bumps 8 enclosures up to 9

89 Active 15K Spindles + 9 Hot Spares = 98 SAS15K Spindles

Total active spindles + total number of hot spares = total spindles

98 450GB SAS 15K Spindles drives needed to meetperformance requirements.

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Compellent Design Capacity Tier 3Customer Wants Total Usable Capacity = 75TB

From Tier 1 requirements

89 Active 15K Spindles x 419GB per Spindle = 37,291GB

37,291GB x 76% efficiency (20% @ R10, 80% @ R5-9) = 28,341GB

75 TB + 20% for Replays = 90TB 90TB needed to meet 75TB requirement

90TB - 28TB = 62TB usable required in T3 TBs needed minus Tier 1 total

62TB @ 80% efficiency(R6-10) = 62TB /.8 = 77.5TB Tier 3 Raid overhead

77.5TB / 1,862GB = 42 Active 2TB SAS7K Spindles Larger capacity @ Tier 3

42 Active 2TB SAS7K Spindles / 11 Spindles per Enclosure = 4 SAS 3.5" 12 BayEnclosures

4 Enclosures with one Hot Spare per Enclosure = 4 Hot Spares

42 Active 7K Spindles + 4 Hot Spares = 46 SAS7K Spindles

46 2TB SAS 7K Spindles required to meet capacity requirement

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Compellent Design - Controller and IO Cards

Series 40 ControllerSlot 1- SAS 6Gb 4 port IO Card

Slot 2- SAS 6Gb 4 port IO Card

Slot 5- 4 port Fibre Channel IO Card

Slot 6- 2 port 10Gb iSCSI IO Card

Slot 7- Cache Card

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Compellent Design Compellent Solution

Tier 19 SAS 12 Bay Enclosures

3 Chains

98 15K (450GB) Drives89 Active

9 Hot Spares

Tier 3

4 SAS 12 Bay Enclosures1 Chain

46 7K (2TB) Drives

42 Active

4 Hot Spares

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Compellent Design Disaster Recovery Site

DR System

Software

Storage Center Core

Dynamic Capacity

Data Instant Replay

Remote Instant Replay Enterprise Manager

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Compellent Design Disaster Recovery Site

Disaster Recovery Site

Single Series 30/40 Controller

1 SAS IO Card

1 iSCSI IO Card

6 SAS 12 Bay 6Gb Enclosures

75 TB + 20% for Replays = 90TB 90TB @ 80% efficiency (R6-10) = 90TB / .8 = 112.5TB

112.5TB / 1,862GB = 61 Active 2TB SAS7K Spindles

61 Active 2TB SAS7K Spindles / 11 Spindles per Enclosure = 6 SAS 3.5" 12Bay Enclosures

6 Enclosures with one Hot Spare per Enclosure = 6 Hot Spares

61 Active 7K Spindles + 6 Hot Spares = 67 SAS7K 2TB Spindles

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Performance Tools Available

Disk Calculator

Specific to Compellent technology

IO Gathering toolkit Set of instructions for gathering IOPs from servers

PLAT - Performance Log Automation Tool

Centralized gathering of Windows perfmon logs Performance Analyzer tool

Automated tool to ingest performance log files and generatereport

Template Reports

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Dell Compellent

Thank you

Documents

CML Mod05 SizingDesignConfiguration RELEASE v3