We just started having this problem too. Our problems started once we
migrated to the 2.6.5-7.244-s390x kernel. In reading through the PTF
(UM31428) as quoted by "Heiko Carstens", it suggests that this PTF
resolves an issue with a DIAG 308. We ran a DIAG TRACE and never saw
DIAG 308 get issued during a "shutdown -r now". We did reach the same
point in the reboot process
<Message>=========================================
md: stopping all md devices
md: md0 switched to read-only mode.
Restarting system.
==================================================
And our TRACE seemed to show a DIAG 44 loop. A lot of CPU getting used
with no I/O. Again as stated in the original post, a #CP IPL brought the
server back up successfully.
Is the UM31428 PTF really the correct PTF for this issue? We're
currently running SLES9 64bit for zSeries under z/VM v5.1 too.
Mark Wiggins
University of Connecticut
Operating Systems Programmer
860-486-2792
-----Original Message-----
From: Heiko Carstens [mailto:[EMAIL PROTECTED]
Sent: Friday, January 13, 2006 5:49 AM
Subject: Re: After run command "shutdown -r now"...
Hi,
> Please teach me.
> I use SLES9 64bit applied SP3 for zSeries under z/VM v5.1.
>
> After I run command "shutdown -r now", z/Linux was
> shutting down normally.
> But next message was displayed in 3270 screen, the system
> didn't start.
>
> <Message>=========================================
> md: stopping all md devices
> md: md0 switched to read-only mode.
> Restarting system.
> ==================================================
>
> After the system displayed "Restarting system." in 3270
> screen, system is not receive any commands.
>
> After logoff from z/VM, logon to z/VM again, and I run the
> command " IPL 100 CL", the system is starting normally.
>
> Please teach me solutions.
Depending on your z/VM version you need to install one of the
PTFs for APAR VM63742 in order to fix this:
- z/VM 4.4: UM31426
- z/VM 5.1: UM31428
Heiko
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