You refer to both a library manager and a TSM server. I assume the TSM
server shares tape drives with the library manager. If the paths from the
TSM server to the drives are still on-line, that may explain part of what
you're seeing. I would have thought off the top of my head that taking the
drives off-line from the library manager would have disabled them from the
TSM server as well, but you probably should do a "Q DRIVE" on the TSM
server that isn't the library manager and see what comes up.

Are you allowing SAN discovery? I wonder if the library manager is
discovering working paths to the drives and working around the paths you're
disabling? (My former sites were always too timid to trust SAN discovery,
so I'm not sure what I envision is plausible, but since what you're seeing
isn't what you expect, it's time to think of ways we could be surprised.)

It shouldn't matter, but which TSM level(s) and hardware platforms?

Just a thought,
Nick


On Mon, Dec 8, 2014 at 8:26 AM, Barkes, Jason <jason.barkes AT sse DOT com> 
wrote:

> Hi,
>         I am trying to identify if I have got SAN or drive issues used in
> our TSM environment.
>
> We have 20 drives with 3 paths to each drive hanging off a number of fibre
> channel adapters.
>
> I want to take all but 4 drives offline.  So I did the following:
>
>
> 1.        Updated drives to offline on library manager
>
> 2.        Updated Paths to offline on library manager
>
> 3.       Updated devclass mountlimit to 4 on TSM Server
>
> 4.       Updated migprocesses to 4 on TSM Server.
>
> I then set off the disk to tape migration.  However, the server was still
> requested tapes to be mounted in drives that were set to offline?
>
> Am I missing something, please ?
>
> Many Thanks, Jason.
>
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