Dell Perc 5/i Performance issues

[Svein Skogen (Listmail Account)]

On 19.06.2010 11:58, oizs wrote:
> I tried almost everything raid 0 1 5 10 with all kind of stripes
> 32/64/128 and settings direct io/cached/read-ahead/wt/wb/disk-cache but
> nothing seems to work.
> I changed the card to another dell perc 5 which had an older firmware.
> Tried 4 kind of motherboards even tried changing the os to linux and
> windows xp/7. In windows I got some funny results 1.3MB/s with
> write-back and 150MB/s reads with 5 disks in raid0.
> I just wanted to have a hw raid with no problems since the motherboard
> 88sx7042 and bsd did not like eachother.

This is from a similar controller running that 8-disk raid5+0 setup:

--------------------------------------------------
CrystalDiskMark 2.2 (C) 2007-2008 hiyohiyo
      Crystal Dew World : http://crystalmark.info/
--------------------------------------------------

   Sequential Read :  665.383 MB/s
  Sequential Write :  300.452 MB/s
 Random Read 512KB :  616.604 MB/s
Random Write 512KB :  306.306 MB/s
   Random Read 4KB :   64.465 MB/s
  Random Write 4KB :    7.646 MB/s

         Test Size : 100 MB
              Date : 2010/06/19 14:24:12

You should be looking at number about half of these. I ran the test with
adaptive readahead enabled, and write-through for cache (since I run
with BBU, I normally use write-back)

//Svein

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