Allen -

There's really nothing to dispute... TSM asks the Library Manager to
mount the tape - but, naturally, TSM has to believe that the tape is in
the library in order to want to request the mount. When TSM restarts it
performs the equivalent of an Audit Library, to assure that its last
knowledge of the library's tape inventory is the same. If the library
says that a tape isn't there, then TSM has to believe that and so deems
the tape(s) unavailable.

The original question involved a pondering, as I read it, as to whether
TSM knows where the tapes are in the 3494. TSM doesn't get involved in
that: it's up to the 3494 and its database to keep track of that. This
relieves TSM of a lot of overhead, as compared with what it has to deal
with in a SCSI type library.

  Richard Sims

On Mar 14, 2005, at 4:07 PM, asr AT UFL DOT EDU wrote:

==> On Mon, 14 Mar 2005 15:21:42 -0500, Richard Sims <rbs AT BU DOT EDU> said:

In a library with a Library Manager, such as the 3494, TSM does not
mount
the tape - the library does, per TSM simply asking the library to
mount
volume 001234.

I'm going to have to dispute this.  I just tested on my 3494, and if my
library manager doesn't see the volume in its' Q LIBVOL, it doesn't
acknowledge the existence of the tape.


I did the following:

1) Restored a file from a client (and therefore determined which tape
it was
   on)

2) CHECKOUT LIBVOLUME remove=no

3) Confirmed volume in scratch category

4) Attempted restore.  Library manager says "CHECKIN LIBVOLUME
required within
   60 minutes."

5) Canceled restore, checked in, checked out again.

6) used mtlib to assign the volume to the correct 'private' category.
(this
   would be analogous to the failed DR scenario)

7) Attempted restore.

8) Attempted restore.  Library manager says "CHECKIN LIBVOLUME
required within
   60 minutes."

... Cleaned up.



You may be confusing the "library manager"-ness of a 3494 with the
"library
manager"-ness of a TSM server.

My configuration has a 3494 attached to a library-manager TSM instance
(which
I call 'CTRL', for controller), and then other TSM instances request
mounts
from the CTRL instance.

When I Q libvol from CTRL, the volumes show up.  When I Q libvol from a
library client, it's empty.



- Allen S. Rout