On Wed, 2010-01-20 at 21:38 +0100, Pieter Wuille wrote:
> Yes, this is possible to determine. By default, the "du" system utility will
> count files occurring more than once in a set of directories only once.
> if you use this three times:
>
> cd /var/lib/backuppc/pc
> du -sh *
> du -sh [all workstations]
> du -sh [all non-workstations]
>
> You get three numbers, A, B and C. B is how much space you will need (excuding
> some filesystem metadata + size of the pool/cpool directories, but if you have
> 4TB of data, this is probably neglectable) on the new backuppc server. A-C is
> how much space you'll be able to free on the original one. Note that these
> commands may take a while (a few hours, i'd say) on a large filesystem.
>
> As for the migration itself, i'd suggest you to first attempt to create two
> identical backuppc configurations, with all data on both. If this works, you
> can delete all workstation-pc-subdirs on the second, and all
> non-workstation-pc-subdirs on the first. The nightly job will then delete all
> files which aren't used by any backup anymore.
> In case this is not possible because of harddisk space constraints, it may be
> a little more tricky/dangerous.
Excellent. You're right, du is going to take a
loooooonnnnnnnngggggggggggggg time, but if it'll keep track, that works
great. And that was about what I was expecting on the copy - space may
be tricky, but I might have a way to temporarily get around that by
adding some extra (non-permanent) storage with LVM for the copy, then
after I trim everything down, I can remove the extra space.
Thanks a lot for the help!
-Ken
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