Dell Perc 5/i Performance issues

[oizs]

Could you tell me exactly how did you configure your raid? I mean 
wb/read-ahead/blocksize/stripe etc.

Much appreciated.
-zsozso

On 2010.06.19. 14:26, Svein Skogen (Listmail Account) wrote:
> 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
>
>