Re: All filesystems hang under long periods of heavy load (read andwrite) on a filesystem

From: Randy.Dunlap
Date: Tue Nov 04 2003 - 10:56:39 EST

On Mon, 03 Nov 2003 15:46:22 -0800 Shirley Shi <shirley@xxxxxxxxxxx> 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?

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