OVM 3.1.1 Add new Fiber Channel LUN on the go

Hello everyone,
I've a question regarding Fiber Channel LUNs. I need to present a new Fiber Channel LUN to my 2 production servers and I would ask what's the best procedure to do this.
Usually I turn off servers present FCP LUN then turn servers on, but what if I can't poweroff servers?? There's a way to present FCP LUNs without powering off servers??
Thanks in advance. ;)

I have already met this problem.
In the Manager, you can right-click a VM Server and select "re-scan physical disks". That sounds like it would work, right?
Well, it has NEVER worked for me. Maybe someone can tell me what I'm doing wrong.
But what DOES work is:
Present the LUN to all servers.
Go to one of the servers, log in as root, and run: rescan-scsi-bus.sh
This makes the new LUN known to the server.
Then go back to the Manger, and do the "rescan physical disks" thing. This gime the new LUN will appear, and it even appears to ALL servers in the cluster. You're done. (It seems like sometimes the LUN will appear in the GUI after running rescan-scsi-bus.sh, without doing anything. But I'm not sure.)

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