[ILUG] Question regarding multipathing

[Braun Brelin]

Hello all,

I have a question regarding creating multipath devices in RHEL 5.

Currently, I have an LVM2 Volume Group that has a PV created from a
physical device, such as /dev/sda1
This physical device actually binds to a LUN presented from a SAN storage
device.

There were issues in the past where, if the primary SAN controller went
down, the server would have to reboot and re-scan the SCSI
bus to pick up the  secondary controller.  Obviously, multipathing would
solve this issue of unplanned downtime.

The question that I have is:

If I create a multipath device name for /dev/sda1 in /etc/multipath.conf,
can I just create a new PV using the new multipath device, delete the old
pv from the volume group and add the new PV in?  Will this work
"transparently" given that the new PV is effectively pointing to the same
place as the old PV?

Braun