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Re: [linux-lvm] LVM and hardware device re-ordering?



Thanks, AJ.

May I propose this question for inclusion in the LVM HOWTO FAQ chapter?

- Don

AJ Lewis wrote:

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,


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