On 6/5/2015 6:17 AM, Jogi Hofmüller wrote:
Dear all,
We recently bought two identical HP Ultrium 448i tape drives. We want
to use them with Bacula and found the white paper "Best Practices for
Disk Backup" [1] that describes how to configure a virtual autochanger.
We applied the necessary changes in order to model our two drives
combined in one virtual autochanger and tried it with a backup job that
needs more than one tape.
No. That is not possible. When a job starts up, it is assigned a Device
resource (from bacula-sd.conf) to write to. It is not assigned to the
Autochanger resource, but rather one of its Device resources (ie. one of
the tape drives). This assignment happens only once at job start. Once
the device is assigned, Bacula then begins selecting volumes to use in
THAT device.But it will not change devices in the middle of a job.
Using two tape drives in a virtual autochanger will work, though. It is
fine for running concurrent jobs without having to manually configure
jobs to spread the load, but it will not allow big jobs to span tapes
without operator intervention.
Bacula used the first tape as expected but when in came to use the
second tape it requested the second tape to be mounted in the first
drive although the tape was correctly mounted in the second drive.
Now I would like to ask the experts if it is possible to make a setup
like I described work and if so, what we did wrong so far. We are
currently using bacula 5.2.6 from Debian stable (8.0 aka jessie). So
far we have been using bacula with one drive for the past 10 years or so
and did not have any problems.
Here are the relevant portions of our configs:
<bacula-dir.conf>
Storage {
Name = TapeChanger
Address = 127.0.0.1
Password = "03292ab58a34fc3895a70a0d6581581c6105a5fd"
Device = Virtual
Media Type = Ultrium2
Autochanger = yes
}
JobDefs {
Name = "DefaultJob"
Type = Backup
Client = hamster-file
FileSet = HomeBackupFileSet
Messages = Standard
Storage = TapeChanger
Priority = 10
}
Job {
Name = "BackupFiles"
JobDefs = DefaultJob
Schedule = DailySchedule
Pool = WeeklyPool
Write Bootstrap = "/var/lib/bacula/BackupFiles.bsr"
}
</bacula-dir.conf>
<bacula-sd.conf>
Autochanger {
Name = Virtual
Changer Device = /dev/null
Changer Command = ""
Device = virtual-0, virtual-1
}
Device {
Name = virtual-0
Media Type = Ultrium2
Archive Device = /dev/nst0
Device Type = Tape
AutomaticMount = yes
AlwaysOpen = yes
RemovableMedia = yes
Autochanger = yes
Drive Index = 0
Volume Poll Interval = 15
Autoselect = yes
}
Device {
Name = virtual-1
Media Type = Ultrium2
Archive Device = /dev/nst1
Device Type = Tape
AutomaticMount = yes
AlwaysOpen = yes
RemovableMedia = yes
Autochanger = yes
Drive Index = 1
Volume Poll Interval = 15
Autoselect = yes
}
</bacula-sd.conf>
Thanks for any input on this matter!
[1] http://blog.bacula.org/whitepapers/CommunityDiskBackup.pdf
Cheers,
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