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From: Arnd Hannemann <>
To: Andre Noll <>
Cc: "adam radford" <>,
	"Tony Battersby" <>,
	"Johannes Wörner" <>,
	"James Bottomley" <>,
	linux-scsi <>,
	linux-kernel <>
Subject: Re: Performance problems with 3ware 9500S-4LP and 2.6.25-rc3
Date: Wed, 27 Feb 2008 00:07:05 +0100	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

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:

Symptons are reasonable performance with large block ops, but really bad performance with small block ops.
time (cp -a linux- linux-; 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,

  parent reply	other threads:[~2008-02-26 23:06 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-02-26 17:43 Andre Noll
2008-02-26 17:54 ` Bernd Schubert
2008-02-27 10:10   ` Andre Noll
2008-02-26 18:33 ` Chris Snook
2008-02-27 10:11   ` Andre Noll
2008-02-27 19:55     ` Chris Snook
2008-02-28  9:46       ` Andre Noll
2008-02-26 23:07 ` Arnd Hannemann [this message]
2008-02-27 10:11   ` Andre Noll
2008-02-27 14:26     ` Tony Battersby
2008-02-27 17:05       ` Andre Noll
2008-02-27 20:06         ` adam radford
2008-02-28  9:46           ` Andre Noll

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