Hello
It appreas that your Lib config is at fault for various reason, when 
networker tris to talk to drive0 for exp, the cmd is being sent to 
somewhere else i.e drive1 and subsiquiently fails ro read.
There are series of steps involved depending on OS\Hardware to get things 
configured correctly.
1. Make sure Your drive order is consistant at bootup, use 
masking\persistant binding where appropriate.
2. For windows check Registry entries under device map to verify which 
lun\drive is being presented to the windows,disable Removable storage 
manager where appropriate.
3. Then Verify each drive's order after boot by series of cmds i.e
Load drive1 as follows.
Sjimm scsidev 6.0.0 slot 1 drive1 (You are loading Drive 1 with tape from 
Slot1)
NEXT use mt –f device path  status to obtain  Tape info, if the tape is 
loaded in that device i.e. \\.\Tape0 the command will return the size and 
tape info, if not Move to next device address \\.\Tape1, and so forth 
until you get the info on the tape .
If you get positive response to your command mt with tape loaded in device 
\\.\Tape0, populate table as follows.
Continue to check status moving Tape from Drive to Drive and noting its 
mapping in the table, i.e.
mt –f \\.\Tape0 status
mt –f \\.\Tape0 offline (Tape is being prepared for removal)
Sjimm scsidev 6.0.0 drive1 drive2 
mt –f \\.\Tape1 status
mt –f \\.\Tape1 Offline

Follow the above process and make a table i.e
Drive0 = Tape \\.\Tape0 
Drive1 = Tape\\.\Tape2 etc.
When you have verified this, re-create the tape lib with the order in 
which you have verified the drive order in jbconfig.
last step may or may not involved, timers, CDI ( off in some case) nsrjb -
Hevvv. etc to tune your lib.
Dont forget to use appropriate drivers for FC\SCSI card & verify drivers, 
also read IBM's read me file on Drivers install.
Not sure if any newer driver is out there but check out 6. ?. 30 frist. ( 
IBM site driver)
HTH

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