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Performance Modeling Hybrid Hard Drive Don Barnetson Associate Director, Flash Marketing

Performance Modeling Hybrid Hard Drive Don Barnetson Associate Director, Flash Marketing Samsung Semiconductor, Inc Dec 6, 2005. Windows Longhorn. DRAM. ATA Controller. Motherboard. 64-128MB NV Cache. Hard Disk Controller. Hybrid Hard Drive – Key Values. Power Savings (90% Less)

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Performance Modeling Hybrid Hard Drive Don Barnetson Associate Director, Flash Marketing

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  1. Performance Modeling Hybrid Hard Drive Don Barnetson Associate Director, Flash Marketing Samsung Semiconductor, Inc Dec 6, 2005 snowday\SEC_Draft_0305.ppt

  2. Windows Longhorn DRAM ATA Controller Motherboard 64-128MB NV Cache Hard Disk Controller Hybrid Hard Drive – Key Values • Power Savings (90% Less) • Write buffer during normaloperation – 90% power reduction • Improved Reliability (tbd) • Duty cycle on platters near zero • HDD in non-operational mode • Fast Boot (5+ seconds faster) • Shutdown/Suspend: keyfiles written to flash cache • Power: files available 3-5 seconds before HDD • Realized performance is highlydependent on the flash used 2.5” HDD

  3. Read disk & process STALL Future with HDD Desktop Active Future with HHD Read disk & process CACHE Desktop Active Depending on type of flash chosen: 2 – 6 seconds Resume – Today and Tomorrow Disk Power Disk Ready BIOS POST Read disk & process Today Desktop Active

  4. FlashType ReadSpeed 64kBReadTime CachedFileSize TimeSavingsOverHDD 73nmSLC 29MB/s 2.2ms 29.6MB 7.35 s 90nmMLC 13MB/s 4.9ms 21.6MB 6.28 s MDOCH-1 8MB/s 8.1ms 16.5MB 5.6 s 73nmOneNAND 108MB/s 0.6ms 38.0MB 8.46 s Cached file size optimized to amount that can be loaded from flash during HDD spin-up time • Gains from flash in two ways: • Able to begin loading data ~3-5 seconds before HDD would be ready • Some flash types able to load data faster than HDD Mechanics of Resume Existing HDD – 100MB Suspend File Read 64kB Process 64kB 3.5ms 5.1ms Repeat 1,500 times

  5. ResumeTimeSavings(higher isbetter) Net CycleperformanceNormalized toOneNAND 7.35 s +3.12 s 6.28 s +10.32 s 5.6 s +6.71 s 8.46 s 0 s Mechanics of Suspend FlashType CachedFileSize WriteSpeed SuspendTime(lower isbetter)* 73nmSLC 29.6MB 17MB/s 9.56 s 90nmMLC 21.6MB 2.5MB/s 15.68 s MDOCH-1 16.5MB 3.8MB/s 11.40 s 73nmOneNAND 38.0MB 17MB/s 7.55 s *Suspend file is unpinned during normal operation, drive is idle, write cache is half full at initiation of suspend step -> 4 s drive spin + 50% cache flush + write flash & HDD suspend files in parallel OneNAND provides substantially increased performancevs. all other flash solutions

  6. Conclusions • Hybrid Hard Drive has Three Values • Power Savings due to write cache • Reliability enhancement due to lower duty cycle • Fast boot/resume due to data pinned to flash cache • Write caching does not challenge flash performance • Various solution provide similar results • Fast boot / suspend requires fast flash • OneNAND provides 3-10 s of savings vs. competingsolutions • OneNAND is the logical choice for Hybrid Hard Drive

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