Hi, what's the safest procedure to reconfigure RH BFS to a new SAN?

Current setup boots rootvg and sanvg from a SAN.
Now a new SAN LUN is presented to the Linux Server.
The first and second SAN are srdf'd - so they are always in sync.

Can I re-use the existing LVM structure and somehow switch the underlying devices to the new LUNs?

Or, do I have to start from scratch, create new luns, re-build LVM, and re-install RH?

Urgent - this is scary. Thanks.

Please see the "Question Guidelines" and the LQ Rules...asking for/expecting 'urgent' help from VOLUNTEERS is fairly rude. And without any relevant details, there is little we can tell you. You say nothing about what kind of SAN, how it's attached, version of RHEL, etc. Best answer anyone can give you is call Red Hat support, since you need 'urgent' help, and you're using RHEL.

There MAY be ways to move what you're up to, but I'd certainly not do it. If you have a SAN and RHEL, you also have a backup system in place. Back up your data, do a fresh install, and restore.