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Date: Tue, 4 Nov 2003 07:52:11 -0800
From: "Randy.Dunlap" <rddunlap@osdl.org>
To: Shirley Shi <shirley@kasenna.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: All filesystems hang under long periods of heavy load (read and
 write) on a filesystem
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On Mon, 03 Nov 2003 15:46:22 -0800 Shirley Shi <shirley@kasenna.com> wrote:

| Can anyone know why all filesystems hang under periods of heavy load on 
| one of the filesystem? Once the filesystems hang, any command related to 
| the filesystem, like 'ls', 'cat',etc., will stick forever until re-power 
| cycling the machine.
| 
| I kept running the following script to read and write the data on a same 
| filesystem(ext2 or XFS) since we need do some tests for the storage. Is 
| half day, onn the beginning, the system was running well. But after 
| running the script for a long time, such a half day, one day or two 
| days,  all filesystems would get hung, including the root filesystem 
| although I didn't do any heavy load on it. The file(M.1) I used for 
| reading and writing is about 2.5GB.
| 
| 
| @ total = 115
| while (1)
|   @ cc = 2
|   while ($cc <= $total)
|      dd bs=512k if=/data/M.1 of=/data/M.$cc
|     echo "copying $cc  of   $total..."
|     @ cc = $cc + 1
|   end
|   rm -f  /data/M.*
| end
| 
| 
| I tried RH8.0 with kernel 2.4.18 and kernel 2.4.21 with XFS and patch 
| rmap15j. I have the same issue running with the two kernels. Basically I 
| have two filesytems configured. One for the root configured with ext3, 
| and another is for the data configured with ext2 or XFS. With either 
| ext2 or XFS, I have the same problem.

Can you try a recent kernel, like 2.4.23-pre8 or -pre9?

--
~Randy