[Bacula-users] Bacula recognizes only 7 slots in an 8-slot-changer

[Jens G. <jen...@eb...>]

Hello list,

I have a strange problem with a Tandberg Storage Loader (some kind of  
autochanger) and bacula. I run Debian squeeze (Kernel 2.6.32-5-686)  
and bacula 5.0.2 (shipped with Debian). The changer has 8 slots and is  
attached to the computer via SCSI. Her is the output of lsscsi -g:

boromir /etc/bacula/scripts # lsscsi -g
[0:0:0:0]    disk    AMCC     9500S-8    DISK  2.06  /dev/sda  /dev/sg0
[0:0:1:0]    disk    AMCC     9500S-8    DISK  2.06  /dev/sdb  /dev/sg1
[1:0:0:0]    cd/dvd  TOSHIBA  ODD-DVD SD-C2732 1051  /dev/sr0  /dev/sg2
[3:0:0:0]    tape    HP       Ultrium 4-SCSI   W51U  /dev/st0  /dev/sg3
[3:0:0:1]    mediumx TANDBERG StorageLoader    0347  /dev/sch0  /dev/sg4

Until last week I defined a slot in the autochanger as a "Cleaning  
Slot" so that I had 7 slots that could be used for backup-tapes. Then  
I decided to clean the drive manually because I read that cleaning the  
drive is actually not necessary. I could better use the slot for  
another backup tape.

So I redefined the former cleaning-slot to an ordinary slot in the  
Tandberg autochanger. That was successfull because the front panel  
indicated the cleaning-slot with a "C" which was gone and replaced by  
an "8" (I defined the tape in slot 8 to be the cleaning tape).

After that I started bconsole and issued an "update slots" command.  
The output looks like this:

boromir /etc/bacula/scripts # bconsole
Connecting to Director boromir.dmz:9101
1000 OK: boromir-dir Version: 5.0.2 (28 April 2010)
Enter a period to cancel a command.
*update slots
Automatically selected Catalog: MyCatalog
Using Catalog "MyCatalog"
The defined Storage resources are:
      1: boromir-sd-100
      2: boromir-sd-1000
Select Storage resource (1-2): 2
Connecting to Storage daemon boromir-sd-1000 at 10.0.0.1:9103 ...
3306 Issuing autochanger "slots" command.
Device "Tandberg" has 7 slots.
Connecting to Storage daemon boromir-sd-1000 at 10.0.0.1:9103 ...
3306 Issuing autochanger "list" command.
Catalog record for Volume "WOC4-01L4" updated to reference slot 1.
Catalog record for Volume "WOC4-02L4" updated to reference slot 2.
Catalog record for Volume "WOC4-03L4" updated to reference slot 3.
Catalog record for Volume "WOC5-01L4" updated to reference slot 4.
Catalog record for Volume "WOC5-02L4" updated to reference slot 5.
Catalog record for Volume "WOC5-03L4" updated to reference slot 6.
Catalog record for Volume "WOC1-01L4" updated to reference slot 7.
*

The strange line is the one that reads "Device "Tandberg" has 7  
slots." because there are actually 8 slots.

I reset the Tandberg autochanger to the default settings and rebooted  
both the changer and the computer that it is attached to. There was no  
change regarding the "update slots" command.

The I tried to get the number of slots via:

boromir /etc/bacula/scripts # ./mtx-changer /dev/sg4 slots
7

So, there are the 7 slots again.

After some investigation I think it is not necessarily a problem with  
bacula but could be a problem with the OS itself. But nevertheless I  
hope you can help me on the issue. I can post config files as you  
need, please tell me what you need.

Does anyone of you know where I can set the number of slots or where  
the number of slots is set by the OS?

Thanks for your help
-- 
Greetings
Jens