[linux-lvm] expanding physical disks

[Paul Jarc]

Andreas Dilger <adilger at turbolinux.com> writes:
> Brian Murrell writes:
>> How does LVM deal with physical disks that can get bigger or smaller,
>> such as a hardware RAID device?
> 
> Doesn't work at this time.  LVM will only see what was originally there
> at the time pvcreate was run (or possibly vgcreate/vgextend).

But it won't do any harm either, right?

> If the new PEs don't all fit into the padding space (it may happen if
> your starting PV size is just a couple hundred kB over n * PE size),
> then you will need to pvmove PE0 from its current location to somewhere
> else in the VG, and then renumber all of the PEs on that PV as (PE# - 1).
> That couble be ugly because I believe the PE number is stored in the
> snapshot tables and such.

Since this is a case of making the PV bigger, all the PEs could simply
be shifted by one; there is, after all, more room at the end now.
That would still be ugly, though.


paul