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

[Don Buchholz <buchholz@easystreet.com>]

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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