Re: [Bacula-users] Autochanger incorrectly assigning first slot number

Hello,

I think this is what we politely call a "pilot error/misunderstanding".

From what you have described, mtx is behaving correctly. Normally I

turn off the mail slot (aka import/export slot) on my autochanger andthe problem goes away. It is my understanding that Bacula can be usedwith a mail slot, but I do not know how -- probably the simplest is tomake sure there is no volume in the mail slot when you are doing an"update slots barcodes" command. If you do that, Bacula should neveraccess slot 1.


Best regards,

Kern


On 06/28/2017 05:44 AM, Ivan Adzhubey wrote:

Hi,

After more testing done today, this looks like a mtx bug: issuing command "mtx
load 1 0" correctly loads tape from the changer slot 1 into the first tape
drive. However, "mtx status" then shows this tape drive as loaded with slot 45
instead (but also correctly lists slot 1 as empty):

# mtx status
   Storage Changer /dev/changer:2 Drives, 45 Slots ( 1 Import/Export )
Data Transfer Element 0:Empty
Data Transfer Element 1:Empty
       Storage Element 1:Full :VolumeTag=A00000L5
       Storage Element 2:Full :VolumeTag=A00001L5
<...>

# mtx load 1 0
Loading media from Storage Element 1 into drive 0...done

# mtx status
   Storage Changer /dev/changer:2 Drives, 45 Slots ( 1 Import/Export )
Data Transfer Element 0:Full (Storage Element 45 Loaded):VolumeTag = A00000L5
Data Transfer Element 1:Empty
       Storage Element 1:Empty
       Storage Element 2:Full :VolumeTag=A00001L5
       Storage Element 3:Full :VolumeTag=A00002L5
<...>

Unfortunately, mtx project seems dead, so no updates...

--Ivan

On Tuesday, June 27, 2017 8:34:47 PM EDT Ivan Adzhubey wrote:

On Tuesday, June 27, 2017 5:42:10 PM EDT Ivan Adzhubey wrote:

The
problem I suspect is with the extra I/O slot which this model has, in
addition to normal slots in the mounted magazines. Mtx command correctly
reports all magazine slots plus the I/O slot (separately). However, Bacula
director seems to have issues with the I/O slot

Correction: This should read "Import/Export" (I/E) slot, not I/O slot. Sorry
about that typo.

Google finds some reports of issues with mtx-changer script failing to
properly parse I/E slot lines returned by "mtx status" for the changers with
I/E slots, due to extra "IMPORT/EXPORT" tag inserted. However, my case is
the opposite since "mtx status" for my changer does not tag the (single)
I/E slot at all, it just appends one extra slot to the list, so that the
last slot listed is always a I/E one:

# mtx -f /dev/changer status
   Storage Changer /dev/changer:2 Drives, 45 Slots ( 1 Import/Export )
Data Transfer Element 0:Empty
Data Transfer Element 1:Empty
       Storage Element 1:Full :VolumeTag=A00000L5
       Storage Element 2:Full :VolumeTag=A00001L5
<...skipped...>
       Storage Element 34:Full :VolumeTag=A00033L5
       Storage Element 35:Full :VolumeTag=A00034L5
       Storage Element 36:Full :VolumeTag=A00035L5
       Storage Element 37:Empty
       Storage Element 38:Empty
       Storage Element 39:Empty
       Storage Element 40:Empty
       Storage Element 41:Empty
       Storage Element 42:Empty
       Storage Element 43:Empty
       Storage Element 44:Empty
       Storage Element 45:Empty
<end of status command output>

Storage element 45 listed above is in fact the I/E slot. For some reason,
Bacula flips it with the slot 1, so when I mount slot 1 in bconsole, it
mounts it as slot 45. However, actual tape from slot 1 is loaded.



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