From: Jan-Frode Myklebust (janfrode@PARALLAB.UIB.NO)
Date: Mon Oct 21 2002 - 12:14:16 EDT
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.
I saw some serious problems with this combination on our regattas early
this year, and have tried to stay away from JFS2 after that. In april
I had to restore one node from mksysb because of lots of filesystem
corruptions. Stresstesting a 150GB JFS2 filesystem by running
bonnie++ -r 64000
on it caused this and other filesystems to 'hang'. Seemed like the
filesystems got metadata updates, but no data updates, so thousands of
files ended up with size=0. Luckily I had a very recent mksysb image
available and restored from that.
I haven't dared testing bonnie++ on JFS2 after that, but if anybody
want to try, they can download it from:
http://www.coker.com.au/bonnie++/
-jf
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