I've had the same .  The problem was tracked to improper mapping between the 
tape numbers in the library and how windows maps them.  In short veritas can 
mount the tapes into a drive but can not remove the tape.  When the process 
responsible for dismounting the tape fails the drive is assumed to be the 
problem and veritas downs the drive.  Use robtest to solve the problem.  Good 
luck.
Darby

        -----Original Message----- 
        From: ida3248b AT post.cybercity DOT dk [mailto:ida3248b AT 
post.cybercity DOT dk] 
        Sent: Fri 12/19/2003 11:41 AM 
        To: M.Laanen AT mindef DOT nl; veritas-bu AT mailman.eng.auburn DOT edu 
        Cc: 
        Subject: Re: [Veritas-bu] PV136T LTO2 drives down after succesfully 
backup
        
        

        Hello
        
        Here is the list we use in situations like this:
        
        Check the system log for SCSI unload errors, this will indicate a 
connection
        problem.
        
        Check driver and driver level for robot and drives.
        
        Check firmware and firmware level for robot and drives
        
        Be aware of that on windows you need the Veritas Tape Device driver
        
        Regards
        Michael
        
        On Fri, 19 Dec 2003 10:08:07 +0100, M.Laanen wrote
        > Hi there,
        >
        > We are having some problems with our PV136T taperobot and NetBackup
        > DataCenter 4.5 (mp5). After the night backups some drives are in a 
down
        > state on the Activity Monitor of NetBackup. When we issue the
        > NetBackup up drive command the drives are usable again.
        >
        > Please advise?
        >
        > Kind regards,
        > Mike Laanen,
        > Architect Technische Infrastructuur
        >
        > Defensie Telematica Organisatie
        > The Netherlands
        > m.laanen AT mindef DOT nl
        >
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