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I am installing SLES SP1 on a SAN disk. I have an issue when it comes to the
multipath boot. I followed the document "SLES 10 Storage Administration
Guide" in particular chapter 5. In that chapter it says to add dm-multipath
to the INITRD_MODULES section of the /etc/sysconfig/kernel and then rebuild
initrd. I did this and my machine went into panic mode on reboot. It appears
to be waiting for the /root device to become available. I can boot to
linuxrc and select the boot installed system option and select the device
that has the installed /root and all is fine. Except that multipath -v2 -d
displays mpath1 as needing configuration.

If I remove the dm-multipath and rebuild initrd the system comes up fine
except that the device-mapper complains about various devices at boot. Also
multipath -v2 -d now says mpath1 and mpath2 need configuring.

My Environment:

IBM JS21 blade (PPC)
QLogic dual port blade card
IBM SVC for storage
mpath0 - on board disk array 63GB
mpath1 - 10GB SVC SAN drive - contains / and /boot partitions
mpath2 - 8GB SVC SAN drive - contains swap partition
mpath3 - 20GB SVC SAN drive - unformatted