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On 30 Oct, 2008, at 17:04 , Freddie Cash wrote:
On October 30, 2008 01:25 am Nikolay Denev wrote:
On 30 Oct, 2008, at 07:00 , Freddie Cash wrote:
On Thu, Oct 30, 2008 at 1:50 AM, Andrew Snow <[EMAIL PROTECTED]>
wrote:
In this way, each day we generate a batch file that lets us step
back one
day. The diffs themselves, compressed with gzip, and extremely
space efficient. We can step back potentially hundreds of days,
though it seems
to throw errors sometimes when backing up Windows boxes, which I
haven't
tracked down yet.
But to be honest, soon you can save yourself a lot of hassle by
simply using
ZFS and taking snapshots. It'll be faster, and with compression
very space
efficient.
That's exactly what we do, use ZFS and RSync. We have a ZFS
/storage/backup filesystem, with directories for each remote site,
and sub-directories for each server to be backed up.
Each night we snapshot the directory, then run rsync to backup each
server. Snapshots are named with the current date. For 80 FreeBSD
and Linux servers, we average 10 GB of changed data a night.
No muss, no fuss. We've used it to restore entire servers (boot off
Knoppix/Frenzy CD, format partitions, rsync back), individual files
(no mounting required, just cd into the .zfs/snapshot/snapshotname
directory and scp the file), and even once to restore the
permissions
on a pair of servers where a clueless admin "chmod -R user /home"
and
"chmod -R 777 /home".
Our backup script is pretty much just a double-for loop that scans a
set of site-name directories for server config files, and runs rsync
in parallel (1 per remote site).
We we looking into using variations on rsnapshot, custom
squashfs/hardlink stuff, and other solutions, but once we started
using ZFS, we stopped looking down those roads. We were able to do
in 3 days of testing and scripting what we hadn't been able to do in
almost a month of research and testing.
Do you experience problems with the snapshots?
Last time I tried something similiar for backups the bachine
began to spit errors after a few days of snapshots.
http://lists.freebsd.org/pipermail/freebsd-fs/2008-February/004413.html
We have 72 daily snapshots so far. Have had up to 30 of them mounted
read-only while looking for the right version of a file to restore.
These are ZFS snapshots, very different from UFS snapshots.
--
Freddie Cash
[EMAIL PROTECTED]
Yes,
Mine were zfs snapshots too, and I've never managed to create more
than a
few days worth of snapshots before the machine start to print "bad
file descriptor" errors
while trying to access the snapshot directory.
But I guess (hope) this problem does not exist anymore when you are
able to do 72 snapshots.
- --
Regards,
Nikolay Denev
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