On Fri, Apr 30, 2004 at 08:55:32AM -0700, Don Buchholz wrote: > The one nagging question in my mind is: > > How resilient is LVM to a sudden renumbering of > physical hard disks? > > Assume no disks have actually failed, just that a new disk > gets added and suddenly all the LVM drives get notched up > a drive letter. It's fine. Each disk (PV) is labeled with a UUID, which uniquely identifies it to the system. 'vgscan' identifies this after a new disk is added that changes your drive numbering. Most distros run vgscan in the lvm startup scripts to cope with this on reboot after a hardware addition. If you're doing a hot-add, you'll have to run this by hand I think. OTOH, if your vg is activated and being used, the renumbering should not affect it at all. It's only the activation that needs the identifier, and the worst case scenario is that the activation will fail without a vgscan with a complaint about a missing PV. Regards, -- AJ Lewis Voice: 612-638-0500 Red Hat Inc. E-Mail: alewis@redhat.com 720 Washington Ave. SE, Suite 200 Minneapolis, MN 55414 Current GPG fingerprint = FE77 4B43 6A9B F982 A731 02FA 2BF5 7574 294A AA5A Grab the key at: http://people.redhat.com/alewis/gpg.html or one of the many keyservers out there... -----Begin Obligatory Humorous Quote---------------------------------------- Computers make very fast, very accurate mistakes. -----End Obligatory Humorous Quote------------------------------------------
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