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Forums & Initiatives » Solid State Storage Initiative
Solid State Storage Initiative (SSSI)Companies are taking a tested and successfully applied idea - high speed
memory used as storage - and a new low cost persistent memory technology -
NAND Flash - to create storage systems that finally have the ability to close
the server/storage performance gap at a reasonable cost. This performance gap
exists today because servers have become increasingly faster while storage
systems, which use Hard Disk Drives (HDDs) that require rotating disks and
mechanical movement of the read/write heads, have not kept up. Servers have
to spend a significant portion of their time waiting on storage I/O
operations to complete, thus negatively impacting system and application
performance. One of the earliest enhancements was the invention of "wear-leveling", a term used to describe the process of making sure that all of the writes are spread evenly across the entire memory module, in order to eliminate any hot spots. Another enhancement was the addition of spare blocks to aid in spreading the writes across a larger amount of memory, further delaying the write limit of a Flash module. Additional enhancements include the use of a small RAM cache used to reduce the number of underlying write operations to a Flash module. Finally, sophisticated Error Correction Codes (ECC), module sparing, and modules configured in a "RAID-like" manner are further examples of innovations developed to extend the longevity and endurance of the NAND Flash storage media beyond typical application cycle life-spans. Pictures from the SSSI Meeting in Dallas at SNW Fall 2008:
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