On 8/11/2011 11:03 AM, ft oppi wrote:
>
>
> He can do this on a per-host basis under pc. Doing each separately is
> likely to work in a reasonable amount of time with rsync (with -H) or
> tar. It won't make the links to pool between different hosts but that
> shouldn't matter on a de-duped zfs.
>
>
> That's what I planned. I can copy a couple of hosts per day, it takes
> time but not much attention. It's even scriptable.
>
> Now as Jeffrey said, plain tar will use a lot more bandwidth than
> BackupPC_tarPCCopy once the pool is copied. But what about the time it
> takes to generate the archive ?
> I mean, if BackupPC_tarPCCopy creates its archive as fast as plain tar
> transfers the data, it's so much better (maybe less write I/O on the new
> server?).
The catch is that you cannot have any changes between the time you rsync
the pool and complete the BackupPC_tarPCCopy. But, you might be able to
do a preliminary rsync of the pool ahead of time, and then running it
again with '--delete' for the cutover should go quickly.
> I think I'll have to try some "tar > /dev/null" and "BackupPC_tarPCCopy
> > /dev/null" to exclude bandwidth from the equation.
Note that gnutar will notice if you have redirected to /dev/null and not
bother to read the input data files (a feature added to support quick
size estimates for amanda, I think). Use ' -f - |cat >/dev/null' to get
a more realistic time. But, I'd use rsync instead of tar if you are
going to do each host separately anyway.
--
Les Mikesell
lesmikesell AT gmail DOT com
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