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Society for Information Mgmt
SSD: Uses for Memory in Storage for Application AccelerationAndrew ReichmanSenior Analyst
Forrester Research
November 20th, 2008
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3Entire contents © 2008 Forrester Research, Inc. All rights reserved.
Agenda
• The Use Case for SSD in Storage
• Nuts And Bolts Of SSD Technology
• Architectural Options for SSD and Cache
• Current Vendor Offerings
• SSD Barriers To Adoption
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4Entire contents © 2008 Forrester Research, Inc. All rights reserved.
The Use Case For SSD in Storage
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5Entire contents © 2008 Forrester Research, Inc. All rights reserved.
SSD Offers Reduced Data Access Time
• SSD storage has much lower latency than traditional hard drives
• Applications that are extremely sensitive to latency in data access are likely to benefit from SSD
• Typical applications include Online Transaction Processing (OLTP) databases
• Data being crunched heavily for analysis that is time sensitive is also a good candidate
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6Entire contents © 2008 Forrester Research, Inc. All rights reserved.
Nuts and Bolts of SSD Technology
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7Entire contents © 2008 Forrester Research, Inc. All rights reserved.
SSD can be DRAM or Flash Based
• DRAM (the same media used for server and array cache) has the highest performance profile
• But, DRAM is the most costly SSD option
• Also, DRAM is volatile, meaning it must be continuously powered to retain data
• Volatility of DRAM requires battery backup
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8Entire contents © 2008 Forrester Research, Inc. All rights reserved.
SSD can be DRAM or Flash Based
• Flash has lower performance than DRAM, but is less costly and is non-volatile
• The cost reduction curve for Flash is steeper
• Flash has resiliency concerns- limited read-write-erase cycle
• Flash can be SLC or MLC
• Performance can be tuned for read or write, but not both- leads to interest split path architecture
• Most current interest in SSD revolves around SLC flash
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9Entire contents © 2008 Forrester Research, Inc. All rights reserved.
But, any SSD Is Expensive
• There are some environments where cost is no object
• For the majority though, the cost of SSD would have to be offset by something else
• SSD can contribute to increased use of SATA
• SSD can reduce the amount of cache in arrays
• For environments that are short stroking for performance, SSD can be cost effective
• SSD often offers power savings over HDD
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10Entire contents © 2008 Forrester Research, Inc. All rights reserved.
Memory as Persistent Storage vs. Cache
• Vendors disagree on whether SSD should be deployed as persistent storage or as cache
• Persistent storage allows admins to use mature processes for management, often using HDD form factor SSD drives
• But, admins must manually determine what to put on persistent SSD, and it may be wasted
• Cache algorithms allow data to move in and out of memory depending on usage
• Cache could allow better utilization of resources
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11Entire contents © 2008 Forrester Research, Inc. All rights reserved.
Architectural Options for SSD and Cache
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12Entire contents © 2008 Forrester Research, Inc. All rights reserved.
SSD/Cache can be Deployed in Many Ways
• Dedicated SSD Array
• HDD/SSD Hybrid Array
• Increased Cache in Array
• Cache Appliance
• Virtualization Appliance
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13Entire contents © 2008 Forrester Research, Inc. All rights reserved.
Dedicated SSD Arrays Have Been Around
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14Entire contents © 2008 Forrester Research, Inc. All rights reserved.
Hybrid HDD/SSD Minimize Disruption
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15Entire contents © 2008 Forrester Research, Inc. All rights reserved.
More Cache in the Array can sit in for SSD
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16Entire contents © 2008 Forrester Research, Inc. All rights reserved.
Cache Appliances Create Global Pools of Memory
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17Entire contents © 2008 Forrester Research, Inc. All rights reserved.
Storage Virtualization Appliances Can Deploy Added Cache
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18Entire contents © 2008 Forrester Research, Inc. All rights reserved.
Vendor Offerings on the Market
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19Entire contents © 2008 Forrester Research, Inc. All rights reserved.
Nearly Every Storage Vendor is Talking SSD
Vendor Product Architecture
Compellent Storage CenterHDD form factor Persistent Storage with automated tiering
DataCore SAN Symphony High Cache Virtualization Appliance
EMCSymmetrix & Clariion HDD form factor Persistent Storage
Gear6 CacheFX Global Cache Appliance
NetApp PAM Cache Module for Arrays
NetApp SAA Global Cache Appliance
Solid Data SD/StorageSpire Dedicated SSD Array
Texas Memory Systems RAM SAN Dedicated SSD Array
Current Offerings on the Market:
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20Entire contents © 2008 Forrester Research, Inc. All rights reserved.
Barriers to Adoption
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21Entire contents © 2008 Forrester Research, Inc. All rights reserved.
Barriers to Adoption
• Cost- SSD still commands a premium over HDD
• Identifying data for SSD is hard; performance analytics tools are weak and under-adopted
• Reliability concerns remain for Flash in enterprise
• Concerns about incompatibility of HDD error codes
• Lack of architecture consensus slows acceptance
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22Entire contents © 2008 Forrester Research, Inc. All rights reserved.
Recommendations
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23Entire contents © 2008 Forrester Research, Inc. All rights reserved.
Recommendations
• Don’t get caught in the hype
• SSD is costly, so be judicious
• Consider how you will identify which data to place on SSD in a persistent architecture
• Performance analytics is critical for SSD success
• Start with applications- if latency is the bottleneck, then SSD might be the answer
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24Entire contents © 2008 Forrester Research, Inc. All rights reserved.
Andrew Reichman
617.613.6172
Thank you
www.forrester.com