We have an ADIC Scalar 1000  Tape Library with 7 DLT8000 tape drives and
two FCR's and an RMU and it's on our SAN.

The NetWorker server is a sun box running solaris that's also on the SAN
through 1 HBA.
Behind the two FCR's are 2 SCSI busses each.
        FCR1
                1st bus
                        Robotics only
                2nd bus
                        2 Tape Drives (0cbn and 1cbn)
        FCR2
                1st bus
                        2 Tape Drives
                2nd bus
                        3 Tape Drives


NetWorker is version 7.0.

The problem I see is that when NetWorker issues an unload command
nothing happens and eventually a number of retries are done which also
fail.

But if during one of the 30 second waits between retries we do an "mt"
command (mt -f /dev/rmt/3cbn offline) the drive starts unloading right
away.

It looks like NetWorker sends an unload through the library whereas the
"mt" command talks directly to the tape drive over the SCSI bus.

Anyone have any idea what we can do to resolve this ?

The library is on a SAN too.

So we have NetWorker to SCSI(over FibreChannel)
SCSI to HBA(config)
HBA to SAN-Port(config)
SAN to FCR in library
FCR to 2 separate SCSI busses on the library
The first SCSI bus has only the library robotics on it.
The second SCSI bus has 2 tape drives (DLT8000).

And we have another FCR with 2 more SCSI busses behind it.
The 1st SCSI bus with 2 tape drives and 2nd bus with 3 tape drives.

We configured the library as a standard SCSI jukebox with jbconfig.
We've played with the timeouts and delays settings - but no effect.

The bottom line is that NetWorker appears to sometimes NOT get the
message to the drive to unload - via the robotics.
I'm considering a script to watch the /nsr/logs/daemon.log for the
"unload timeouts" and maybe automatically issue a "mt -f /dev/rmt/xcbn
offline" command to start the unload.

Thanks - John

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