Messages in this thread | | | Date | Wed, 27 Feb 2008 00:07:05 +0100 | From | Arnd Hannemann <> | Subject | Re: Performance problems with 3ware 9500S-4LP and 2.6.25-rc3 |
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Andre Noll schrieb: > 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.
Could you give some numbers, please?
However there are some known issues:
http://forums.storagereview.net/index.php?showtopic=25923 http://tumbleweed.org.za/2007/02/16/horrific-performance-with-3ware-raid
Symptons are reasonable performance with large block ops, but really bad performance with small block ops. time (cp -a linux-2.6.24.2 linux-2.6.24.2b; sync) Gives me with some tuning 50 seconds here with a 9650SE in a 4 disk raid5 setup. (very bad, single disk will do it in <30s!!!) But reading and writing large files with large block sizes is usually beyond > 100 MB/s
[snipped a lot]
> Andre
Best regards, Arnd
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