Oracle rman LAN-free to virtual tape timeout issue

The setup: TSM servers are ver 5.3.2.0, running on AIX. The situation in
question involves one TSM server instance that the client backs up to, and
a TSM server instance acting as a library manager for a virtual tape
library.

The client (ver 5.3.2.0) is LAN-free, and doing an rman backup of an Oracle
database. The session starts and is proxied normally to the library
manager, the tape gets mounted, and the catalog compilation starts.

15 minutes and a few seconds later (that's just over 900 seconds) - and
it's always this long, but it's also always the same time each day, 4:15 AM
- the proxied session that's holding the tape drive open gets severed
(ANR0480W) from the TSM backup server. A few minutes later, the catalog
compilation finishes and the client tries to start backing up files, but
can't because there isn't a tape available; the backup fails.

The commtimeout parameter on both of the TSM servers is 16,400 seconds; on
the storage agent it's 14,400. The idletimeout parameter on the servers and
the storage agent is 720 minutes. The throughputtimethreshold on the
storage agent is 270 minutes. There aren't any timeout-type parameters set
in the stanza for this node in the dsm.sys file.

Am I missing some timeout parameter that has a default of 15 minutes? Could
rman be timing something out?

Any ideas?

Robben Leaf


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