Saturn2888 <[email protected]> wrote on 04/12/2011 12:11:49
AM:
> Les, that's a pretty good idea, running two, but I cannot do that
> with these systems sadly. It'd be really nice to not have to take
> the machine down to do the backup though. So I guess that's my
> question, I'm looking for a way to backup the pool over Ethernet
> while it's running.
If the pool is changing (as in, the filesystem is mounted and BackupPC is
running), then you *must* have some sort of snapshot capability, and in
any case, you're going to have to bounce BackupPC at least *briefly*.
Therefore, you have two options: 1) LVM Snapshot/dd or 2) Break a RAID
mirror while unmounted.
> While it's possible to dd an lvm snapshot, that's 1TB/day which is
> quite a huge amount of time and bandwidth consumed. Is there no
> other solution like ddsnap?
Once you've got the LVM snapshot, you can do whatever the heck you want to
with it: any magic tool you wish for handling the dd.
> I mean, since my BackupPC pool is on an
> lvm, doing a dd itself isn't the problem. It's that it's 1TB/day or
> more depending on my file system size. It'd be really nice to have a
> solution to sync only the changes of that day which then, I can
> snapshot on the other machine. In my case, that other machine is the
> iSCSI target. I think DRBD is my best bet now, but it's more than a
> handle to figure out; that's for sure.
With DRDB, you won't have to dd *ever*. BUT, it won't help you in the
case where something becomes corrupted (say, BackupPC gets confused and
deletes things): DRDB will *happily* corrupt both copies. It's like
RAID: RAID is not subsititue for backup.
There's no substitute for unconnected copies. DRDB probably won't give
you thtat.
Timothy J. Massey
Out of the Box Solutions, Inc.
Creative IT Solutions Made Simple!
http://www.OutOfTheBoxSolutions.com
[email protected]
22108 Harper Ave.
St. Clair Shores, MI 48080
Office: (800)750-4OBS (4627)
Cell: (586)945-8796
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