From: Viren Gupta (virender_gupta@TIMEINC.COM)
Date: Mon Oct 21 2002 - 13:54:10 EDT
Here are the symptoms that occurred.
The application is written in C++. While the app was running (approx
10 processes)
- simple shell commands like rm, ls -l, df, du against the filesystem
would hang. Could not <Ctrl C> out of the command, had to close the
session.
- topas and other similar commands showed a fixed number of I/O wait
processes, this never changed.
- the kill -9 command would not work, although the prompt was returning.
- even worse could not do a clean shutdown, it would hang at the message
"now unmounting filesystems" - had to do a soft reset from the HMC.
The most peculiar thing was that the same app/data was running properly
in one partition, same level, setup etc., but causing the above
problems in another. The difference being that the working partition
had a 200 gb filesystem, while the non working one was 750gb.
IBM sent me a long report from another customer with similar symptoms.
The APAR to fix the problem is IY18859. When setting up the partitions
I used JFS for rootvg filesystems, but wanted to exploit the advantages
of JFS2 for others.
Viren Gupta
janfrode@PARALLAB.UIB.NO wrote:
>On Mon, Oct 21, 2002 at 09:52:00AM -0400, Viren Gupta wrote:
>
>>Due to some incompatibilities with various third party software I have
>>switched to 32 bit mode. This caused a problem with a filesystem using
>>JFS2. Required an APAR (IY18859) to fix. If anyone has had a
>>similar problem or has a similar setup ( 32 bit kernel using JFS2) you
>>can contact me via the list or offline for more details.
>>
>
>I'd be very interessted in hearing about your JFS2 problems on 32-bit
>kernel.
>
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