topic Issue with LVM in Operating System - Linux

Issue with LVM

ALe_3 — Wed, 22 Feb 2006 05:29:55 GMT

Hi all,
I am setting up a SAN area with linux machines accessing an EVA8000 and having FC2242 as HBA. The O.S. installed is RH-ES ( this is the output of uname -a command: Linux machine1 2.6.9-22.ELsmp #1 SMP Mon Sep 19 18:32:14 EDT 2005 i686 i686 i386 GNU/Linux). I am trying to do some vgexport and vgimport of vg containing EVA8000 "disks" from machine1 to machine2. I present a disk on machine1 and create a volume group with this disk, then I do the vgexport and unpresent the disk on machine1. At this point I present the same disk on machine2 but it doesn't see it, so I boot the machine2 and the machine does't come up,I have to detach machine2 from EVA and perform the boot again. Can someone help me?

Re: Issue with LVM

Ivan Ferreira — Wed, 22 Feb 2006 07:25:29 GMT

I think that the problem could be that:

1- When you present the new disk with the machine2 up, this won't be the new disk until you use a rescan utility, like hp_rescan from fibreutils or rescan-scsi-bus.sh.

2- When you restart the machine, your disks device names changes and tha's why you cannot boot.

You should try discovering the new disks with the system up.

Re: Issue with LVM

ALe_3 — Fri, 24 Feb 2006 10:38:06 GMT

Thanks for your suggestion.
Anyway the issue is on LVM2 in fact even if I perform a vgexport on a local disk and then reboot the machine, this doesn't come up. On the contrary using LVM1 the machine boots properly (I re-installed the machine).
I have opened a call to RedHat on this issue and they will let me know.