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On Monday 22 September 2003 09:07, Little, Chris wrote:
> you will probably have to ipl the guests that share the filesystem.
> because of our change control, it's rare that we update /usr so the other
> guests mount it read-only.
Actually, you have to mount the partition read-only on *all* guests,
including the one that you use to make changes to it, or you risk
silent data corruption or random crashes on the other guests. If you
want any guest to write to a shared file system, you need to use
a file system that supports this, like OpenGFS.
When you want to update the contents of the read-only partition, make
a copy of it (using e.g. 'dd if=/dev/dasdx2 of=/dev/dasdy2" or 'cp -ax
/usr /mnt/newusr' from linux or your favourite VM tool to do the same)
and make the changes on the new file partition. Then arrange your
guests to mount the changed disk for the next IPL. That can be done
e.g. by using rdist to load a new /etc/fstab to all guests or by
changing the kernel parameter line from VM (if you are using shared
kernels or IPL from virtual reader or have the VM parameter patch
installed).
Arnd <><
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