On Tuesday, January 11, 2011 14:54:38 Ivan Labáth wrote:
> On 01/10/11 14:36, Hubert Kario wrote:
> > On Monday 10 of January 2011 14:25:32 Carl Cook wrote:
> >> Here is my proposed cron:
> >>
> >> btrfs subvolume snapshot hex:///home /media/backups/snapshots/hex-{DATE}
> >>
> >> rsync --archive --hard-links --delete-during --delete-excluded --inplace
> >> --numeric-ids -e ssh --exclude-from=/media/backups/exclude-hex
> >> hex:///home /media/backups/hex
> >>
> >> btrfs subvolume snapshot droog:///home
> >> /media/backups/snapshots/droog-{DATE}
> >>
> >> rsync --archive --hard-links --delete-during --delete-excluded --inplace
> >> --numeric-ids -e ssh --exclude-from=/media/backups/exclude-droog
> >> droog:///home /media/backups/droog
> >>
> >> Comments? Criticisms?
> >
> > This will make the dates associated with snapshots offset by how often
> > cron is run.
> >
> > In other words, if you run above script daily you will have data from
> > 2011.01.01 in the hex-2011.01.02 directory.
> >
> > I do save the current date, do a LVM snapshot on the source, rsync
> > --inplace data over and do a local snapshot naming the folder using the
> > saved date. This way the date in the name of backup directory is exact
> > to about a second.
>
> If you are mounting a LVM snapshot of an already mounted filesystem,
> would you be willing verify that it is really a snapshot that is mounted?
>
> e.g. touch /mnt/live/its_alive && ls /mnt/snapshot/
>
> I am nearly willing to bet it is not a snapshot.
well, by "LVM snapshot on the source" I meant:
1. do lvcreate --snapshot
2. mount newly created volume
3. use the new directory as the base for rsync
4. arrange umount and destruction of the snapshot after rsync completes (no
matter if it was successful)
and this will in fact not make the "its_alive" visible in /mnt/snapshot
You have to use this procedure if you use LVM snapshots for backup no matter
to where do you copy data. That's why I shortened it to a single point -- it's
not the part that is important from btrfs perspective.
Regards.
--
Hubert Kario
QBS - Quality Business Software
02-656 Warszawa, ul. Ksawerów 30/85
tel. +48 (22) 646-61-51, 646-74-24
www.qbs.com.pl
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