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im currently running Windows Server 2012 R2 with a HGST (Hitachi) z7k500-500 2.5 SATA drive.

I have a Smart Array E200i.

Read is about 140MB/S but write is only from 7-14MB/S.

I already updated the smart array firmware but same problem.

I checked the disk for bad sectors but everything ok.

The disk was completly new and is only 2 days old.

I dont have any comparsion (like crystaldiskmark) to 10k SAS drives but i remember that they're very very faster.

screenshot: http://prntscr.com/ex93ic

MrCash
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Things to think about:

  • SATA disks on a Smart Array E200i will downshift to 1.5Gbps link speeds instead of 3Gbps or 6Gbps.
  • Do you have a write cache (BBWC)? Is the battery healthy? If not, you're losing performance because incoming writes would incur disk rotational latency.
  • Do you only have one disk? Would more drives make sense for performance and data protection purposes?
ewwhite
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  • In logs since 2007 the battery is low so the write cache is temporaly disabled. Do i lose lot of performance with write cache disabled? – MrCash Apr 17 '17 at 11:53
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    Yes, you do. [That's your problem](https://serverfault.com/questions/450242/what-is-the-memory-module-on-a-raid-card-needed-for/450253#450253). – ewwhite Apr 17 '17 at 12:56