__________________________________________
Ranga Nathan / CSG
Systems Programmer - Specialist; Technical Services;
BAX Global Inc. Irvine-California
Tel: 714-442-7591 Fax: 714-442-2840
"Fargusson.Al
an"
<Alan.Farguss To
[EMAIL PROTECTED] [email protected]
> cc
Sent by: Subject
Linux on 390 Re: Minidisk caching causing file
Port corruptions?
<[EMAIL PROTECTED]
.MARIST.EDU>
08/19/2005
09:20 AM
Please
respond to
Linux on 390
Port
<[EMAIL PROTECTED]
.MARIST.EDU>
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.
Seems like that to me.
I suspect that there are still some big-endian bugs in reiserfs.
Point noted. I think it is safer to move to ext3. How about others like
jfs, xip etc?
-----Original Message-----
From: Linux on 390 Port [mailto:[EMAIL PROTECTED] Behalf Of
Ranga Nathan
Sent: Friday, August 19, 2005 8:53 AM
To: [email protected]
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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