You should be able to test this.  If you turn off MDC and you don't get any 
more corruption then the problem was MDC.

I am doubtful that it is MDC.  What should happen is that the Linux kernel will 
sync the filesystem before it stops, then VM will sync the minidisk.

I do hear about corruption on reiserfs more often then on ext3.  This seems to 
occur more often on PPC systems then x86.  I suspect that there are still some 
big-endian bugs in reiserfs.

-----Original Message-----
From: Linux on 390 Port [mailto:[EMAIL PROTECTED] Behalf Of
Ranga Nathan
Sent: Friday, August 19, 2005 8:53 AM
To: LINUX-390@VM.MARIST.EDU
Subject: Minidisk caching causing file corruptions?


Over a period of time I have observed that when a Linux guest is brought
down with signal shutdown (Linux gets this signal as a shut down or halt
and signals the ttys and daemons) we get file system errors. I am beginning
to suspect mini disk caching. Even though we do not share minidisks for
writing across the guests, for some reason z/VM or Linux is not flushing
the buffers when Linux guests are brought down.

I am assuming that z/VM itself flushes the disks when the guest is brought
down as well as when z/VM shuts down.

We use SLES9 and reiserfs.  Outside the z/VM environment, I do not see or
hear of so many incidents of file corruption using reiserfs. There seems to
be some gap in my understanding here.
__________________________________________
Ranga Nathan / CSG
Systems Programmer - Specialist; Technical Services;
BAX Global Inc. Irvine-California
Tel: 714-442-7591   Fax: 714-442-2840

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