SUMMARY: DL180s poor I/O performance

From: joe fletcher <joe_fletcher_at_btconnect.com>
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.

Cheers


________________________________

From: sunmanagers-bounces@sunmanagers.org on behalf of joe fletcher
Sent: Tue 11/11/2008 11:41 AM
To: sunmanagers@sunmanagers.org
Subject: DL180s poor I/O performance



Hi,

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
I
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
capability.

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

Any info gratefully accepted.

Cheers

Joe
_______________________________________________
sunmanagers mailing list
sunmanagers@sunmanagers.org
http://www.sunmanagers.org/mailman/listinfo/sunmanagers
_______________________________________________
sunmanagers mailing list
sunmanagers@sunmanagers.org
http://www.sunmanagers.org/mailman/listinfo/sunmanagers
Received on Sun Dec 7 07:36:45 2008

This archive was generated by hypermail 2.1.8 : Thu Mar 03 2016 - 06:44:13 EST