Using Capacity Magic to Size Storwize V7000 Disk Systems
Short Description
Using Capacity Magic to Build the Right Configuration in eConfig and Using the Storage Tier Advisor Tool (STAT) to Sh...
Description
IBM System Storage®
IBM Storwize V7000 Using Capacity Magic to Build the Right Configuration in eConfig and Using the Storage Tier Advisor Tool (STAT) to Show SSD Value Bill Wiegand – ATS February 15, 2011
© 2010 IBM Corporation
IBM System Storage®
Agenda Part 1:
Capacity Magic (CM) Overview
Demo: Using CM to Build the Ideal Configuration with eConfig
Part 2:
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Storage Tier Advisor Tool (STAT) Overview
Demo: Using the STAT Utility to Determine the Value of SSDs
© 2010 IBM Corporation
Capacity Magic Overview
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© 2010 IBM Corporation
IBM System Storage®
Storwize V7000 SSD RAID Presets
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Preset
Description
Raid level
Width Goal
Spare Goal
Chain Balance
SSD RAID-5
Striped with parity
5
8
1
Yes
SSD RAID-6
Striped with dual parity
6
12
1
Yes
SSD RAID-10
Mirrored then striped data, only protected against drive failure
10
8
1
Yes
SSD RAID-0
Striped for performance, no redundancy
0
8
0
Yes
SSD Easy Tier
Use this for Easy Tier Hybrid pools
10
2
1
Yes
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IBM System Storage®
Storwize V7000 HDD RAID Presets
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Preset
Description
Raid level
Width Goal
Spare Goal
Chain Balance
Basic RAID-5
Striped with parity
5
8
1
No
Basic RAID-6
Striped with dual parity
6
12
1
No
Basic RAID-10
Mirrored then striped, only protected against drive failure
10
8
1
No
Balanced RAID-10
Protected against drive and enclosure failure
10
8
1
Exact
RAID-0
No protection against drive failures, best used for temp volumes or if using volume mirroring
0
8
0
No
© 2010 IBM Corporation
IBM System Storage®
Spare Drive Creation The GUI uses the following algorithm to allocate spares when creating spares automatically:
For every 23 array members with the same drive class on a single chain a single spare will be created – 24-46=2 spares – 47-69=3 spares – Excludes RAID 0 members
Examples: – 24 identical drives on a single chain • 1 spare and 23 members
– Chain 1: 2 SSDs and 10 450GB SAS drives – Chain 2: 2 SSDs and 10 450GB SAS drives • The system will create the following spares • Chain 1: 1 x SSD spare and 1 x 450GB spare • Chain 2: 1 x SSD spare and 1 x 450GB spare
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© 2010 IBM Corporation
IBM System Storage®
Capacity Magic Overview Capacity Magic (CM) supports Storwize V7000
It configures your storage pools, RAID arrays and spares just like the Storwize V7000 GUI does You can override some defaults in the Storwize V7000 GUI and always via the CLI, but Capacity Magic is designed to mimic the GUI – Previously CM did not allow for overriding spare configuration but V5.6.1 now does • Allows you to configure no SSD spares if desired • Thus if you want just 2 SSDs and will use SAS drives as spares you will be able to do this in CM now
– Currently the Storwize V7000 GUI will not allow you configure a SSD RAID array and add it to an existing pool with HDD backed MDisks unless you use the “Easy Tier Preset” • If you create a RAID-5 SSD array you must use the CLI to add it to an existing pool
– CM now allows you to configure any SSD RAID array and add to an existing pool with HDD backed MDisks • Warning message popup explains you must use CLI to add to an existing pool
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IBM System Storage®
Capacity Magic Overview Report function very useful as it shows how to configure enclosures in eConfig to match what Capacity Magic suggests for layout based on ‘Recommended Configuration’ of RAID arrays
E.g. if you have SSDs and more then one enclosure you want the SSDs divided between enclosures on different SAS chains – Capacity Magic does this for you in report section of final results
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IBM System Storage®
Capacity Magic Overview
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© 2010 IBM Corporation
IBM System Storage®
Capacity Magic Overview
Decimal: Total drives times drive capacity
Decimal: # of extents times extent size
Binary: Capacity hosts can actually use
Twenty 300GB data drives: 300,000,000,000 * 20 = 6,000,000,000,000 6,000,000,000,000 / 268,435,456 = 22351.74 extents Two extents per data drive reserved for quorum disk use: 22351.74 – 40 = 22311.74 Five extents reserved per pool for future use: 22311 – 5 = 22306 .74 of an extent not available since less then a full extent: 268,435,456 * .74 = 198,642,237
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© 2010 IBM Corporation
IBM System Storage®
Capacity Magic Overview Tool available for download at:
Business Partners: – https://www304.ibm.com/partnerworld/wps/servlet/mem/ContentHandler/capacit ymagic
IBMers: – https://w303.sso.ibm.com/sales/support/ShowDoc.wss?docid=E272838K7573 5I92&infotype=SK&infosubtype=S0&node=doctype,S0|doctype,STL|| clientset,IA|industries,&appname=CC_CFSS
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IBM System Storage®
Capacity Magic Demo
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© 2010 IBM Corporation
Storage Tier Advisor Tool (STAT)
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IBM System Storage®
Easy Tier SSDs (Solid State Drives)
Very high performance but expensive per GB To get the most value from SSD investment must use them wisely
Nothing in the product will disallow other combinations
Easy Tier is only supported with SSDs as Tier_0 and HDDs as Tier_1
– Example: SAS to NL SAS allowed but it is not supported – http://www01.ibm.com/support/docview.wss?rs=591&uid=ssg1S1003703#_Easy
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Easy Tier algorithms are tuned specifically to optimize for SSDs
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IBM System Storage®
Easy Tier
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Pool
Tiers
Volume
Easy Tier Activity
Off
One
Off
None
Off
One
On
None
Off
Two
Off
None
Off
Two
On
None
Auto
One
Off
None
Auto
One
On
None
Auto
Two
Off
Measure
Auto
Two
On
Manage+Measure
On
One
Off
Measure
On
One
On
Measure
On
Two
Off
Measure
On
Two
On
Manage+Measure
© 2010 IBM Corporation
IBM System Storage®
Easy Tier To start using SVC/Storwize V7000 Easy Tier:
No license required Simply add SSD MDisks to a Pool containing regular HDD MDisks Easy Tier will then start collecting and measuring Volume extent usage statistics and managing all Volumes within the Pool performing appropriate extent migrations as needed
Measurement
The measurement functionality of Easy Tier can be enabled without purchasing SSDs – Using the CLI set Easy Tier to “On” from “Auto” for the pool to be measured
SVC/Storwize V7000 will produce a performance summary file which can be copied from the system for analysis The data produced will help to determine if SSDs may be beneficial and if so which storage pools might be good candidates for Easy Tier IBM Storage Tier Advisor Tool (STAT) is available for download to allow analysis of Storwize V7000 statistics – http://www-01.ibm.com/support/docview.wss?uid=ssg1S4000935
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© 2010 IBM Corporation
IBM System Storage®
STAT Whitepaper Whitepaper available for download at:
Business Partners: – http://partners.boulder.ibm.com/src/atsmastr.nsf/WebIndex/WP101852
IBMers: – http://www.ibm.com/support/techdocs/atsmastr.nsf/WebIndex/WP10185 2
Customers: – http://w3.ibm.com/support/techdocs/atsmastr.nsf/WebIndex/WP101852
Using your favorite Internet search engine use key words: – “Using STAT Easy Tier”
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© 2010 IBM Corporation
IBM System Storage®
Storage Tier Advisor Tool (STAT) Demo
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© 2010 IBM Corporation
IBM System Storage®
© 2010 IBM Corporation
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