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Re: [Bacula-users] Configuring autochanger with SAS LTO-5 drives
2017-06-03 06:03:29
Hello,
In Bacula the "variables" that are set in the bacula-sd.conf file are
normally referred to as Directives. In general their scope is within
the enclosing brackets that define the particular resource (e.g. Device
{ ... } or Autochanger { ...}
Normally for a Device resource that is part of an autochanger, you do
not need to specify the Changer Device directive or the Changer Command
directive, because they already be defined in the Autochanger resource.
Within the Autochanger resource, the Changer Device should point to the
scsi control channel for the changer -- in your case below this would be
/dev/sg4.
The Control Device directive within a Device resource is used to specify
the scsi control device for the Drive. This control device is used for
TapeAlerts. I strongly recommend setting up tape alerts under Bacula
7.9 and later as it will let you know when there are drive problems. In
prior Bacula version the implementation was too simplistic and so there
was no need to specify a Control Device. Even in 7.9 and later you are
not required to specify a Control Device within the Device resource.
Yes, the Control Device is primarily used for Tape Alerts, but it can
also be used in the Enterprise version for drive locking and autochanger
sharing.
Final note: Both Changer Device and Changer Command are normally
specified only in an Autochanger resource. However, the original
autochanger implementation was for a single drive autochanger, and in
that case, Bacula did not have an Autochanger resource as the Device
itself can be a single drive Autochanger by specifying the Changer
Device and Changer Command within the Device resource. I hope that is
clear, and I see the documentation is not totally clear. I have
attempted to correct this in the latest manual that is on www.bacula.org.
Best regards,
Kern
On 06/03/2017 05:02 AM, Ivan Adzhubey wrote:
On Thursday, June 1, 2017 11:27:49 PM EDT Ivan Adzhubey wrote:
[7:0:0:0] mediumx QUALSTAR TLS-8466 227d /dev/sch0 /dev/sg4
[8:0:0:0] tape IBM ULTRIUM-HH5 BBNF /dev/st0 /dev/sg2
[8:0:1:0] tape IBM ULTRIUM-HH5 BBNF /dev/st1 /dev/sg3
But I am still confused about few bits of configuration not very well
explained in the documentation. I have used LTO-4 Device section from the
distribution bacula-sd.conf file as a template. Here is my questions:
a) I have added ChangerDevice directive to the Device resources for the
drives, pointing to their corresponding raw SCSI devices (/dev/sg2, /dev/
sga3), while Autochager has ChangerDevice configured as /dev/sg4. Is this
configuration correct? I am assuming these tape raw devices only used for
the purpose of running AlertCommand on the drives?
Obviously, the above assumption was wrong because btape crashes if I specify
anything other then the autochanger's raw SCSI device as the ChangerDevice
under Device resource for the tape drives.
Does this mean Device {...} will not localize variables specified inside them?
What about other resources? I could not find anything in the documentation
regarding the variables scope inside bacula-X.conf files.
Of course, I might simply hardcode /dev/sgX names into TapeAlert strings.
Thanks,
Ivan
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