Tier 1 - DataCore Software

Report
SANsymphony™-V
Automated Storage Tiering
Highlights for the new feature in R8.1
August, 2011
1
Automated Storage Tiering
“Making best choice of real estate on your behalf”
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Dynamically migrate
virtual disk blocks among
different classes (tiers)
of storage
Best location at the time
determined by:
►
►
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Classify tiers according to
price, performance &
capacity
►
2
Access frequency
User preferences
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Pricing / Licensing
►
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Included in vL4 & vL5
Optional on vL2 & vL3
• Priced per node
►
Not available on vL1
 Sales Collateral
►
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Expanded PPT & technical
feature descriptions
Web site update
White Paper
Live Test Drive update
e.g., SSD, SAS, SATA
Copyright © 2011 DataCore Software Corp. – All Rights Reserved.
Sales Positioning
 Get best use of your investment in disk space
 Only heterogeneous auto-tiering software solution
►
►
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Negotiate best deal for each tier
►
►
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3
Not confined to one manufacturer
Not confined to one frame (array)
5%
Override for special workloads
Cached for additional speed
►
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Device-independent, incorporates existing disks
Just like all of our comprehensive solution set
Minimize need for expensive drives
Thin-provisioned to occupy
minimum capacity
35%
Fastest/
Most Expensive
Midrange/
Modestly Priced
60%
Low Cost /
Highest Capacity
Copyright © 2011 DataCore Software Corp. – All Rights Reserved.
Traditional: Virtual Disk Assigned to Tier
 Different pools satisfy different

performance/capacity needs
Best practice: Don't mix disks of different performance
characteristics and/or sizes within one pool
Tier 1
Fastest Performance
Tier 2
Balanced performance/costs
 ERP
 Transactional workloads
 Databases
4
Tier 3
High capacity/Low Cost
 File
 Email
 User home directory
 Archive
 Backup-to-disk
 Scratch files
Copyright © 2011 DataCore Software Corp. – All Rights Reserved.
Fixed Tier Assignment may not be Optimal

Access patterns within sections of virtual disk
vary dramatically
►
For example, some files within a file system may be more
popular than others at any given time:
• frequently accessed blocks
• moderately accessed blocks
• infrequently accessed blocks

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More pronounced with clusters of virtual servers
sharing a common virtual disk
Results in poor use of high performance, premiumpriced disks (especially SSDs)
►
5
Prevents other performance-oriented workloads from getting
adequate response
Copyright © 2011 DataCore Software Corp. – All Rights Reserved.
Automated StorageTiering: Concept
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6
Combine disks of different performance characteristics
within a disk pool
Define which disks correspond to each tier
according to:
► Price / performance / capacity
SANsymphony-V monitors access rates to groups of
disk blocks (known as chunks)
Most active chunks are placed on fastest disks,
less active chunks on slower disks
If chunk activity changes (increases/decreases) over a
sustained period, the chunk is moved to a more
appropriate tier
Copyright © 2011 DataCore Software Corp. – All Rights Reserved.
Auto Tiering – How it works
 Monitor sustained I/O behavior across groups of disk


blocks (chunks)
Compare access frequency against average for each tier
Promote or demote chunks to most suitable tier
Tier 1
Tier 2
Tier 3
Chunks
Above average
moves up a tier
7
Below average
moves down a tier
Copyright © 2011 DataCore Software Corp. – All Rights Reserved.
Sensing Hot Spots within a Virtual Disk


Heaviest hit blocks take advantage of
Tier 1 performance
Other blocks moved to Tier 2 & Tier 3
VIRTUAL
DISK
Frequently
Accessed
DISK POOL
Tier 1
Tier 3
Moderately
Accessed
Infrequently
Accessed
8
Tier 2
Copyright © 2011 DataCore Software Corp. – All Rights Reserved.
Storage Profiles

Set preferences for individual Virtual Disks (VDs)
► Defines policy hints for promoting or demoting chunks
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"High" profile will only use the fastest tier resources
within a pool

"Low" profile will only sit on on the
lowest cost / slower tiers

"Medium" profile will migrate chunks among all
available tiers
9
Copyright © 2011 DataCore Software Corp. – All Rights Reserved.
Virtual Disk distribution within a pool
 Each Virtual Disk has a Storage Profile assigned
 Storage Profiles define tier preferences
DISK POOL
VD
Storage Profile
"High"
Tier 1
Tier 3
VD
Storage Profile
"Low"
Tier 2
VD
Storage Profile
"Medium"
10
Copyright © 2011 DataCore Software Corp. – All Rights Reserved.
Auto-Tiering FAQs
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11
Q: How many storage tiers are supported within a pool?
A: Up to 16; Usually 3 tiers will cover most needs
Q. How frequently will the algorithms migrate disk chunks
A: No more than every 2 or 3 hours to prevent thrashing due to short bursts
Q: How are tier levels assigned to disks in the pool?
A: IT assings disks to tiers according to their perceived
price/performance/capacity tradeoffs
Q: Can the tier level of disk in the pool be changed?
A: Yes. Anytime, non-disruptively
Q: Can the Storage Profile of a Virtual Disk be changed?
A: Yes. Anytime, non-disruptively
Q: Does Auto-Tiering replace the fixed assignment of a virtual disk to
a tier?
A: No. Auto-Tiering complements fixed assignment. You can also override
the automatic migration by pinning a virtual disk to a specific tier
Copyright © 2011 DataCore Software Corp. – All Rights Reserved.
www.datacore.com
Copyright © 2011 DataCore Software Corp. – All Rights Reserved.

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