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 ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390