On 07/01/11 16:20, Hubert Kario wrote:
I usually create subvolumes in btrfs root volume:
/mnt/btrfs/
|- server-a
|- server-b
\- server-c
then create snapshots of these directories:
/mnt/btrfs/
|- server-a
|- server-b
|- server-c
|- snapshots-server-a
|- @GMT-2010.12.21-16.48.09
\- @GMT-2010.12.22-16.45.14
|- snapshots-server-b
\- snapshots-server-c
This way I can use the shadow_copy module for samba to publish the snapshots
to windows clients.
Can you post some actual commands to do this part
I am extremely confused about btrfs subvolumes v the root filesystem and
mounting, particularly in relation to the default subvolume.
For instance, if I create the initial file system using mkfs.btrfs and
then mount it on /mnt/btrfs is there already a default subvolume? or do
I have to make one? What happens when you unmount the whole filesystem
and then come back
The wiki also makes the following statement
*"Note:* to be mounted the subvolume or snapshot have to be in the root
of the btrfs filesystem."
but you seems to have snapshots at one layer down from the root.
I am trying to use this method for my offsite backups - to a large spare
sata disk loaded via a usb port.
I want to create the main filesystem (and possibly a subvolume - this is
where I start to get confused) and rsync my current daily backup files
to it. I would then also (just so I get the correct time - rather than
do it at the next cycle, as explained below) take a snapshot with a time
label. I would transport this disk offsite.
I would repeat this in a months time with a totally different disk
In a couple of months time - when I come to recycle the first disk for
my offsite backup, I would mount the retrieved disk (and again I am
confused - mount the complete filesystem or the subvolume?) rsync
(--inplace ? - is this necessary) again the various backup files from my
server and take another snapshot.
I am hoping that this would effectively allow me to leave the snapshot I
took last time in place, as because not everything will have changed it
won't have used much space - so effectively I can keep quite a long
stream of backup snapshots in place offsite.
Eventually of course the disk will start to become full, but I assume I
can reclaim the space by deleting some of the old snapshots.
--
Alan Chandler
http://www.chandlerfamily.org.uk
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