Re: lvm: creating a snapshot

[lee <lee@yagibdah.de>]

Brian Candler <b.candler@pobox.com> writes:

>> The volume group concept is for grouping the *disks*, so you can treat
>> a group of disks with similar properties as a
>> interchangeable.  So it makes more sense to have volume groups for
>> e.g. "15krpm" and "SSD".  Or you can just have one big volume group,
>> which makes disk upgrades seamless.
>
> And remember that when you create a logical volume, you can specify which
> physical volumes you want it to be created on, out of that volume group.
> So even with one big VG you don't lose the flexibility to assign different
> logical volumes to different physical disks.

Can I merge multiple volume groups into one?

That should be easily possible because the LVs can reside where they
are, and their container is the only thing that changes.  Once they are
merged, I should be able to move any LV to any device which is part of
the VG.

I wouldn't need to move any of the VGs because the VG resulting from the
merge would have free space so that I could finally make snapshots.
When I'm done with the snapshots, I could split the VG again.

Is that possible?


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Hallowed are the Debians!