ionice is a nice program to include with pvmove.

I guess the easier thing for me is the live moving part.

On Mon, Dec 7, 2009 at 3:14 PM, Les Mikesell <lesmikesell AT gmail DOT com> 
wrote:
> Shawn Perry wrote:
>> I an not suggesting that you use LVM to expand a partition, but it is
>> much easier to move a partition to a new and larger disk/array when
>> it's on an LVM.
>>
>> Put another way
>>
>> 1.  Add the new disk/array
>> 2.  run pvcreate on it
>> 3.  vgextend the old VG to include the new disk/array
>> 4.  pvmove from the old array to the new array
>> 5.  vgreduce the old PV from the VG
>> 6.  resize the file system.
>
> Where's the easy part, compared to unmounting the old partition, dd'ing
> it to the new, then resizing?
>
>> Hardware willing, you don't even have to reboot or take backuppc offline.
>
> I suppose that could be an advantage, but I'd expect backups to be
> unrealistically slow for the duration of the pvmove so you might as well
> stop and unmount.
>
>> As far as BackupPC goes, I do not believe that speed is life.  I
>> believe that reliability and flexibility is life.  This isn't a
>> database server here.  Pick a good fast reliable RAID array (I like
>> RAID 10 with a hot spare) and have at it.
>
> Agreed there, but LVM seems like an unnecessary layer.  And unless you
> need something bigger than available disks, I prefer raid1 so you can
> recover data from any single disk.
>
> --
>   Les Mikesell
>    lesmikesell AT gmail DOT com
>
>
>
>
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