SUMMARY: DL180s poor I/O performance

From: joe fletcher <>
Date: Sun Dec 07 2008 - 07:36:29 EST
In the end it appears to be a case of getting what you pay for. I replaced the
entry level E200 disk controller with the more upmarket P400 unit and can now
get 150MB/s through the disks. The P400 supprts NCQ and also has a larger
write cache. Seems to have done the trick.



From: on behalf of joe fletcher
Sent: Tue 11/11/2008 11:41 AM
Subject: DL180s poor I/O performance


Now I've got the Dl180s up and running I'm seeing relatively poor disk
throughput. The machines use 7200rpm 500Gb SATA drives. Regardless of config
can't seem to get more than 40Mb/s through them. I've tried various kernel
optimisations, ufs, zfs, single hardware LV, multiple hardware LVs

Is this just a function of the SATA disks ( I can get 75Mb/s on a DL360 using
146Gb 15K rpm SAS drives even with no optimisation)? Must confess I've never
SATA drives before and I can't seem to find any docs indication likely

I'm running Sol10 x86 u5 with cpqary3 v1.9.1 array drivers.

Any info gratefully accepted.


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Received on Sun Dec 7 07:36:45 2008

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