Re: Performance problems with 3ware 9500S-4LP and 2.6.25-rc3

Bernd Schubert
2008-02-26T17:54:32Z

Hello Andre,

On Tuesday 26 February 2008 18:43:14 Andre Noll wrote:
> Hi
>
> we are experiencing massive performance problems with two of our
> Linux servers that contain 3ware controllers on a Tyan mainboard and
> a couple of 1T disks.
>
> During the daily cron job that uses rsync to sync a 500G file system
> from another machine to the raid on the 3ware controller the load
> jumps up, and the machine becomes sluggish as hell. For example, an
> ssh login to that machine takes minutes to complete and ldap becomes
> unreliable while the rsync job is running. Even Nagios complains
> about the machine being down while rsync is running.

do you have the write-back cache of the controller enabled for your disks?
When you disable this cache, the controller will also disable the disks,
cause a write-performance between 3 to 8MB/s per disks.

Cheers,
Bernd

--
Bernd Schubert
Q-Leap Networks GmbH