On Thursday 03 February 2011 00.29:31 Alan Brown wrote:
> On 02/02/11 22:16, Jeremiah D. Jester wrote:
> > Hello,
> >
> > Frequently, bacula jobs stall on a 'waiting for a mount request'.
> > However, when I do mount the requested tape, it still doesn't run.
> > Wondering what I'm doing wrong here. Any ideas?
>
> I've just been discussing this with HP, Overland and on the -dev list.
>
> It's come up on this list a few times before, across several brands and
> technology of tape drive.
>
> It's _also_ come up on a couple of lists for other backup packages.
>
> Use tapeinfo to check the drive's /dev/sg* and see what it responds with
>
> Odds are good that your tape drive has "prevent media removal" set. Try
> using "mt -f /dev/nst[drive] unlock", then mt eject and see if the tape
> is released or if you get a i/o error.

I forgot that mt has an unlock command (it is not in my man pages), so using mt 
unlock is *far* simpler than writing a program as I suggested.

If Bacula does not have the drive open, then mt unlock and mt eject should 
definitely unload the drive.  If not, there is either a Linux driver bug, or a 
hardware problem  Note: I would do:

  mt rewind
  mt unlock
  mt eject


>
> A few tape devs have tried to blame scsi reservations but I don't
> believe bacula uses reservations _and_ I also suspect that if it was the
> case then 'mt fsf' wouldn't work.

Bacula doesn't do any direct SCSI commands.  They are all done via mtx or 
whatever program you use for changing tapes in your autochanger.

Kern

>
> I'm beginning to believe there's some generic problem with the way that
> most tape drives respond to locking/unlocking requests.
>
> (Interestingly: after using tapeinfo, the PMR seems to have been
> unlocked.....)
>
> > Thanks for your time.
> >
> > Jeremiah
> >
> >
> > *status storage
> >
> > ....
> > Device status:
> >
> > Autochanger "DELL_124T" with devices:
> >
> >    "Drive1" (/dev/nst0)
> >
> > Device "Drive1" (/dev/nst0) open but no Bacula volume is currently
> > mounted.
> >
> >     Device is BLOCKED waiting for mount of volume "000051L4",
> >
> >        Pool:        Offsite
> >
> >        Media type:  LTO4
> >
> >     Slot 12 is loaded in drive 0.
> >
> >     Total Bytes Read=0 Blocks Read=0 Bytes/block=0
> >
> >     Positioned at File=0 Block=0
> >
> > Device "FileStorage" (/tmp) is not open.
> >
> > ====
> >
> > Used Volume status:
> >
> > 000051L4 on device "Drive1" (/dev/nst0)
> >
> >     Reader=0 writers=0 devres=1 volinuse=0
> >
> > ====
> >
> > *status slots
> >
> > The defined Storage resources are:
> >
> >      1: File
> >
> >      2: Tape
> >
> > Select Storage resource (1-2): 2
> >
> > Automatically selected Catalog: MyCatalog
> >
> > Using Catalog "MyCatalog"
> >
> > Connecting to Storage daemon Tape at 10.200.1.124:9103 ...
> >
> > 3306 Issuing autochanger "slots" command.
> >
> > Device "DELL_124T" has 16 slots.
> >
> > Connecting to Storage daemon Tape at 10.200.1.124:9103 ...
> >
> > 3306 Issuing autochanger "list" command.
> >
> > Slot |   Volume Name    |   Status  |     Media Type       |
> > Pool          |
> >
> > ------+------------------+-----------+----------------------+------------
> >--------|
> >
> >     1 |         000107L4 |    Append |                 LTO4
> >
> > |            Scratch |
> >
> >     2 |         000025L4 |  Disabled |                 LTO4
> >
> > |            Offsite |
> >
> >     3 |         000053L4 |    Append |                 LTO4
> >
> > |            Scratch |
> >
> >     4 |         000124L4 |    Append |                 LTO4
> >
> > |            Scratch |
> >
> >     5 |         000122L4 |    Append |                 LTO4
> >
> > |            Scratch |
> >
> >     6 |         000123L4 |    Append |                 LTO4
> >
> > |            Scratch |
> >
> >     7 |         000125L4 |    Append |                 LTO4
> >
> > |            Scratch |
> >
> >     8 |         000126L4 |    Append |                 LTO4
> >
> > |            Scratch |
> >
> >     9 |         000127L4 |    Append |                 LTO4
> >
> > |            Scratch |
> >
> >    10 |         000128L4 |    Append |                 LTO4
> >
> > |            Scratch |
> >
> >    11 |         000043L4 |    Append |                 LTO4
> >
> > |             Onsite |
> >
> >    12 |         000051L4 |   Recycle |                 LTO4
> >
> > |            Offsite |
> >
> >    13 |         000052L4 |    Append |                 LTO4
> >
> > |            Scratch |
> >
> >    14 |         000033L4 |    Append |                 LTO4
> >
> > |            Scratch |
> >
> >    15 |         000037L4 |    Append |                 LTO4
> >
> > |            Scratch |
> >
> >    16 |         000054L4 |    Append |                 LTO4
> >
> > |            Scratch |
> >
> > You have messages.
> >
> > Jeremiah Jester
> > Informatics Specialist
> >
> > Microbiology -- Katze Lab
> >
> > 206-732-6185
> >
> >
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> >
> >
> > _______________________________________________
> > Bacula-users mailing list
> > Bacula-users AT lists.sourceforge DOT net
> > https://lists.sourceforge.net/lists/listinfo/bacula-users



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