On Thu, 2004-05-06 at 10:12, Carl Wilhelm Soderstrom wrote:
having wrestled with amanda's taping scheme for quite some time; I assure
you it has some really braindead annoyances.
There is one that is a killer - it can't split a single filesystem run
across two tapes. The rest it does much better than I'd ever do
myself.
(like not scheduling large
backups to go on tape first, so the tape gets filled maximally; or not
first backing up hosts that haven't been backed up for a while, so they're
more likely to get to tape instead of continuing to fail;
Give it some holding disk space and these things take care of themselves
as you flush anything that didn't fit on the first try. You shouldn't
ever have anything that continues to fail (or even fails once).
or easily telling
it "back up as much as you can to tape, leave the leftovers on disk to be
flushed manually").
If that doesn't happen by itself you have something configured wrong.
Your 'reserve' value has to be reasonable to allow it to do fulls
onto the holding disk instead of going to degraded mode and only
doing incrementals after it runs out of tape, but you really have
to go out of your way to keep it from making at least an incremental
every run and leaving it on disk if it can't go to tape. The only
thing it can't figure out is if any single filesystem doesn't fit
on a single tape. It will try, fail, leave it on disk, and fail
every time you try to flush it, but that is the only instance you
should have to fix by hand.
I'm trying to migrate our setup to something like that... BackupPC for
onsite backups; and amanda for offsite. Better yet, BackupPC for everything,
and let it put recent data to tape occasionally for offsite storage.
I just need funding for a new backup server.
When my tape drive wears out I'll probably go for the biggest firewire
disk drives I can find, configured as raid mirrors and just trade one
periodically and re-sync to rotate for offsite. I use my desktop
machine as the backup server since it isn't doing anything at
night anyway. Meanwhile amanda does the best job I've seen at making
sure that within every set of 10 tapes there is at least one full run
of every filesystem, and every night it has at least an incremental
of each one and the incremental levels are the lowest that are likely
to fit. I don't see any way to get those concepts to mesh with
backuppc.
---
Les Mikesell
les < at > futuresource.com
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