Re: HP-UX 11v3, Multipathing, LVM, and ServiceGuard Clusters

David Douthitt <ddouthitt@xxxxxxx> writes:

I'm trying to multipath a LVM volume on HP-UX 11i v3 with
ServiceGuard. The disks are on an EMC array, and there are two links
to the disk on each of two ServiceGuard cluster nodes.

One (data) disk is currently configured with logical volumes and so
forth. Attempting to use vgextend to add a second path results in:


# vgextend -g pvg1 /dev/clvol2 /dev/dsk/c6t0d1

I think you are supposed to use the new device names ("ioscan -kfnN")

Verification of unique LVM disk id on each disk in the volume group
/dev/clvol2 failed.
Following are the sets of disks having identical LVM disk id
/dev/dsk/c7t0d1 /dev/dsk/c6t0d1

Could it be that both devices are alternate paths to the same disk?



What am I missing? The initial vgcreate did not have a -g option
(that was before I knew about that option). I created /etc/lvmpvg
with the appropriate disk in it, but the message above is what
results.

I thing PVGs are unrelated here.


I don't know scsimgr, and I'm still learning ServiceGuard. What am I
missing here?

Maybe try a pvdisplay to find out more details of the disks.
BTW: In our environment each LUN has four paths to consider ;-)

Ulrich
.

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