[linux-lvm] Two drives with the same UUID

[linux-lvm] Two drives with the same UUID

[lvm]

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If I had a system with a functional LVM configuration (1.0.6ish) and I
were to "duplicate" the drive in it (i.e. dd if=/dev/sda of=/dev/sdb)
and then try to boot that system (with both drives installed and
functional), what would happen?

Of course, because I am asking, I have tried it.  :-)  During boot LVM
failed to find any logical volumes.  Is this expected?  It's not
surprising mind you, but I wonder how it was designed to deal with
this situation.

b.

-- 
Brian J. Murrell

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Re: [linux-lvm] Two drives with the same UUID

[Fabian Herschel]

On Friday 10 January 2003 22:38, lvm@interlinx.bc.ca wrote:
> If I had a system with a functional LVM configuration (1.0.6ish) and I
> were to "duplicate" the drive in it (i.e. dd if=/dev/sda of=/dev/sdb)
> and then try to boot that system (with both drives installed and
> functional), what would happen?
>
> Of course, because I am asking, I have tried it.  :-)  During boot LVM
> failed to find any logical volumes.  Is this expected?  It's not
> surprising mind you, but I wonder how it was designed to deal with
> this situation.

Sorry, but this is a normal reaction of the logical volume manager. Why?
Each "normal" volume manager uses a special part of the disk device (or a
special part of a partition) to identify the physical media. If you copy the
complete disk, you also copy this unique identifier. So LVM get confused
to find a media twice.

Best regards
Fabian Herschel
>
> b.

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