Ssdread like performance 100200 mbs 31 may 2012 disks

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Unformatted text preview: es   Solid state drives are based on NAND flash memory   no moving parts; performance characterisKcs driven by electronics and physics – more like RAM than spinning disk   relaKve technological newcomer, so costs are sKll quite high in comparison to hard drives, but dropping fast 31 May 2012 Disks and File Systems 19 University of Washington SSD performance: reads   Reads   unit of read is a page, typically 4KB large   today’s SSD can typically handle 10,000 – 100,000 reads/s     31 May 2012 0.01 – 0.1 ms read latency (50 ­1000x beber than disk seeks) 40 ­400 MB/s read throughput (1 ­3x beber than disk seq. thpt) Disks and File Systems 20 University of Washington SSD performance: writes   Writes   flash media must be erased before it can be wriben to   unit of erase is a block, typically 64 ­256 pages long usually takes 1 ­2ms to erase a block   blocks can only be erased a certain number of Kmes before they become unusable – typically 10,000 – 1,000,000 Kmes   unit of write is a page   wriKng a page can be 2 ­10x sl...
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This document was uploaded on 04/04/2014.

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