Re: [gentoo-user] Backups and snapshots [Was: Organising btrfs subvolumes]

[Joost Roeleveld]

On Tuesday 27 May 2014 11:32:22 Rich Freeman wrote:
> On Tue, May 27, 2014 at 11:21 AM, J. Roeleveld <joost@××××××××.org> wrote:
> > Does anyone know how these will handle (and perform) with a possible 300+
> > snapshots per filesystem (or volume, as I think it's called)?
>
> I can't speak for zfs.  I had upwards of 1000 snapshots on my system
> before I stopped creating them hourly and and just started having
> issues with it.

Ok, it can handle my backup schedule then. :)

> I wouldn't really say it is ready for prime time, but it is workable.
> Of course, you'll still want backups - a million snapshots does you no
> good if some bug wipes out your filesystem.  For one of my ENOSPC
> incidents I ended up just wiping the entire filesystem and restoring
> from backup, though if I kept at it I'd probably have been able to fix
> it.

Agreed, this is why the backup system would be adjusted for BTRFS on the 
fileserver, when I get round to it. I would probably keep snapshots active for 
the past 2 weeks.

> Oh, one other tip if you use btrfs - be sure you have a rescue disk
> that supports it.  Hint, the old Gentoo install CD I had lying around
> didn't.  You'll probably want to keep a rescue CD with a recent kernel
> and btrfs-tools handy at all times.

Always important. I just saw the other email which states that the latest 
sysresccd supports it. That is fine for me.

--
Joost