I have worked around my problem with raw LVM2 partition backups.
FYI, I am doing this to backup my BackupPC pool, which resides entirely
on a LVM2 partition. This is
substantially faster then trying to do a file backup of the BackupPC
pool, due to the hard link handling
in bacula. The space requirement on tape does not change much as the
BackupPC pool is already
compressed.
I found that I had to use a FIFO to perform the raw backup. For
whatever reasonm I just could not get bacula
to write the raw partition using File = /dev/vg/partition in my fileset
directive.
Since I could not find any documentation for setting up a fifo from a
runBeforeJob script, I began experimenting...
What I found was that I could not just write a script that would create
a FIFO and then background a 'dd' command, bacula would hang on the 'dd'
process.
My solution was to write a little (very basic) perl server (this script,
of course, will be further developed):
#! /usr/bin/perl
my $fifo = '/tmp/cmdfifo';
while (1) {
my $cmd = '';
open(FIFO, $fifo);
while (<FIFO>) {
$cmd = $_;
}
close FIFO;
print "fifo commander: received command '$cmd'\n";
if ($cmd =~ /^BACKUP/) {
print "fifo commander: executing backup setup script...\n";
system('/etc/bacula/backuppc_create_snapshot');
}
}
exit;
(end script)
(The fifo's in the /tmp directory were created before execution)
In my bacula-dir.conf job definition I just use the line:
RunBeforeJob = "sh -c 'echo BACKUP >>/tmp/cmdfifo'"
Which sends a command to my script, which runs the script in /etc/bacula
to create a snapshot, and start
'dd':
#! /bin/sh
#
# backuppc_create_snapshot
#
# Bash script to unmount old snapshot, then create new one. Designed to
be called by bacula
# before backups written.
#
#umount /mnt/snapshot/backuppc
lvremove -f /dev/vg/snap_backuppc
lvcreate -s -n snap_backuppc -L50G /dev/vg/backuppc2
#mount /dev/vg/snap_backuppc /mnt/snapshot/backuppc
setsid dd if=/dev/vg/snap_backuppc of=/tmp/testfifo bs=16384
(end script)
This system worked. I was able to back up my BackupPC pool in about
4hrs as opposed to 20+ it took before.
Maybe this is not the best way of doing things, but it works and seems
to perform well. I am thinking of enchancing my perl server to take
more complex command to set up any snapshot/partition...
Jeff
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