PE2650 / PowerVault 220S Performance issue

Seth Mos seth.mos at xs4all.nl
Fri May 14 03:41:01 CDT 2004


Mark Watts wrote:
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> 
> I have a PV220s stuffed full of 146GB scsi U320 drives, hooked up to a PE1750.
> They're configured as a 13 disk raid-5 with a hot spare.
> Filesystem is ext3 running on Mandrake 10.0 (2.6.3 kernel)
> 04:03.0 RAID bus controller: Dell Computer Corporation PowerEdge Expandable RAID Controller 4/Di (rev 02)

<snip>

> Version 1.02c       ------Sequential Output------ --Sequential Input- --Random-
>                     -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
> Machine        Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP  /sec %CP
> ircd.eris.qineti 4G 28774  99 89047  93 54483  21 34335  89 115549  20 575.2   1
>                     ------Sequential Create------ --------Random Create--------
>                     -Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
>               files  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP
>                  16  2192  99 +++++ +++ +++++ +++  2197  99 +++++ +++  5526  99
> ircd.eris.qinetiq.com,4G,28774,99,89047,93,54483,21,34335,89,115549,20,575.2,1,16,2192,99,+++++,+++,+++++,+++,2197,99,+++++,+++,5526,99

Not very special scores, you might be interested in adjusting the 
read-ahead settings under linux, see /proc and/or search the archives. 
You should be able to go past the 200MB/sec easily with this config.

I can do 150MB/sec with a 6 disk raid 10, your raid 5 should double 
that. You might get even further doing some channel splitting and a 
Perc4/DC (if you have a free slot).

Use the megaraid32 driver instead of the megaraid driver if you are not 
already using that one.

Cheers




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