Enterprise SSD’s and the Holy Grail - Flash Memory ... · Enterprise SSD’s and the Holy Grail...
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Enterprise SSD’s and the Holy Grail Bernie Rub, CTO Storage Flash Memory Summit 2011 Santa Clara, CA 1
Transcript of Enterprise SSD’s and the Holy Grail - Flash Memory ... · Enterprise SSD’s and the Holy Grail...
Enterprise SSD’s and the Holy Grail
Bernie Rub, CTO Storage
Flash Memory Summit 2011Santa Clara, CA 1
SSDs for Enterprise Customers
• Initial Enterprise adoption:• Performance• Power
• Widespread Enterprise adoption requires a more comprehensive approach:• Sustained and predictable
performance• Consistent quality and reliability• Value
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2.5%Innovators Early
Adopters13.5%
EarlyMajority
34%
LateMajority
34%Laggards
16%
Performance
QualityValue
Serving Enterprise Applications
• Sustained and Consistent Performance• Always on 100% duty cycle• Balanced reading and writing• No degradation towards end of life
• Uncompromising quality and reliability• Robust data protection• Factory processes to guarantee quality
• Value• Enable wide adoption in
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High Endurance &
High Performance
Low$ / GB
Targeting Value
0.7 1.0 7 10 25 50
Random Drive Writes Per Day (by segment)
Entry Mainstream Max Performance
Flash Cost(by media type)
SLC
eMLC
cMLCEndurance Enhancement
x14
Sustained performance for 5 years(800GB, 80K IOPS with 70/30 mix)Mostly Read
Applications
Current Mainstream Enterprise Offerings
Initial Enterprise Focus
10
Endurance Enhancement
• Required to deliver 10 random drive writes per day with MLC
• Relying on SSD level opportunities that are not available or economical at flash component level
• Multi-faceted• Flash Management• Wear Mitigation• Error Recovery
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SSD Level Opportunities
• Adjusting flash settings• Optimal settings for each die• Adjusted over life of product
• Flash aggregation• Take advantage of population statistics
• Sharing expensive features• e.g. gate-intensive LDPC channel
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DO NOT ATTEMPT TO ADJUST FLASH
SETTINGS WITHOUT DATA & EXPERIENCE
……
……
Tanner (factor) graph CheckBit
Flash Aggregation• Take advantage of population statistics• Analogous to variable density techniques in HDD• Aggregate capability >> capability of each component
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PE Cycles
Component LevelEndurance
SSD LevelEndurance
Guarantee Full Distribution
Flash Aggregation utilizesaverage endurance of
all parts in SSD
IncreasedEndurance
Flash Characterization
• State-of-the-Art “Kitchen” to prepare“Secret Sauce”
• Develop and demonstrate endurance enhancements• Large scale testing• Data warehouse and analysis infrastructure
• Five Star Chefs:• In-house NAND Flash
Reliability expertise
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State-of-the-Art “Kitchen”
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Guarantee Outgoing Quality
• Traditional On-going Reliability Testing (ORT)• Well established in HDD • SSD Challenge End-of-life wear
• Need new processes• Capability to greatly accelerate testing• Simulate end-of-life behavior• Guarantee consistent performance No end-of-life degradation
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Endurance Enhancements- Flash Adjustments Over Life- Population Statistics
Flash Expertise- Testing Infrastructure- Extensive Characterization
Outgoing Quality Testing- Accelerated Testing to GuaranteeEnd-of-Life Behavior
Holy Grail for Enterprise SSD’s
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Performance
Quality
Value
