Zoltan,
You may very well be on the right track in suspecting hardware issues.
We recently experienced a problem with similar symptoms on a new TSM/3583
install. Although the messages were not identical to what you posted, a bad
SCSI card manifested itself by library components disappearing
mid-operation. We were getting messages referring to missing elements, no
devices found to match what was defined for the PATH, and medium not
present when a tape was mounted and already being used.
You might want to run diagnostics on the card, and check that there are no
issues with the cabling.
Ted
