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Re: [Bacula-users] Using two changers in same pool
2017-07-04 10:17:34
On 7/3/2017 6:46 PM, Per olof Ljungmark wrote:
On 2017-07-03 17:01, Kern Sibbald wrote:
Hello,
There is no way to get two autochangers to work on the same Volumes.
You can try but it is almost sure to fail, because it was not
designed that way. You can potentially use the two autochangers with
two separate pools, and get Bacula to use both of them. This
(multiple drives with separate pools) was implemented for stand-alone
drives, but it was never tested, because it was not needed after
implementing autochangers.
If someone were *really* interested he/she would need to test it and
correct any problems in the code. I am *very* busy implementing
other new features that are very important so I would not be the
person to do it.
Most people in your place would simply swap out his drive and put in
a newer one with more capacity (unless you are already using LTO-7).
Otherwise most other people would swap out the two autochangers and
get a single one with more cartridges.
Best regards,
Kern
Hi,
If that is the case, no, I will not try and will mess with the code,
others do that better.
But still, even if two changers cannot work with the same volume, they
can still work with the same pool which is good enough for me.
No. It is possible to assign different media types to the two
autochangers so that the volumes could technically be in the same pool,
but this will fail in practice. If a client's backups are spread across
both changers, a restore will fail because the restore job is assigned a
read drive on only one of the changers.
And, changers are mechanical devices that sometimes break, having two
means you can loose one and still do your job.
Automated failover with autochangers is complex, since there are
multiple drives, multiple tapes, etc. Automated failure detection is
tricky. Manual failover should be possible by using only one of the
autochangers at a time by having two different SD configs and starting
baucla-sd with one of the two..
Cheers,
//per
On 07/03/2017 12:05 PM, Per olof Ljungmark wrote:
Hello,
As stated in the subject, how can one get two (identical) changers
work together seamlessly in the same pool so when one has its tapes
filled up the next will continue without intervention?
Thanks,
//per
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