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

Hello Ivan,

I was trying to point out that in general, to avoid spinning oneswheels, one should not initially point at bugs in Bacula or bugs in mtx,since most initial setup problems are a question of misunderstanding(perhaps unclear documentation) and configuration issues. Certainly bugsdo exist. In this case, it seems to me that Patti Clark has given youthe necessary configuration "tricks" to make Bacula and mtx workcorrectly with a mail slot.


Best regards,

Kern


On 06/28/2017 10:53 PM, Ivan Adzhubey wrote:

Hi Kern,

On Wednesday, June 28, 2017 11:01:01 AM Kern Sibbald wrote:

Hello,

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

Which one? I do not see any error I might have made, certainly nothing that
would require strong words ;-)

 From what you have described, mtx is behaving correctly.  Normally I
turn off the mail slot (aka import/export slot) on my autochanger and
the problem goes away. It is my understanding that Bacula can be used
with a mail slot, but I do not know how -- probably the simplest is to
make sure there is no volume in the mail slot when you are doing an
"update slots barcodes" command.  If you do that, Bacula should never
access slot 1.

Disabling mailslot in the changer's configuration was my initial idea as well.
However, I decided to first try installing full set of magazines into the
carousel, occupying all carousel faces, and lo and behold - this has fixed all
mtx slot numbering errors immediately.

Before that, we had some faces on the carousel completely vacant, with no
magazines installed. Looks like such configuration, while supported by the
changer documentation, confused mtx and caused it to loose track of the
mailslot position. Now, with all carousel faces occupied by magazines (some of
them empty), the mailslot is correctly tagged in the mtx output by the
"IMPORT/EXPORT" string and load/unload commands no longer confuse storage
element slot #1 with the mailslot.

I am not sure how common this problem could be. We previously ran Qualstar
RLS-4445 changer with varying number of magazines installed and never had any
issues with Bacula loosing track of the slot numbers. This model however, did
not have a mailslot.

--Ivan



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