5190/5194 Modular Tape Subsystem Manual

Operating the Cartridge Tape Drive and ACL
5190/5194 Modular Tape Subsystem Manual—426878-002
4-19
Rewinding a Tape to BOT
Cartridges That Do Not Unload
When a cartridge cannot be unloaded successfully, the message panel displays an
error code or message. If this happens, press RESET and then UNLOAD. When the
drive has recovered from the error state, the cartridge is ejected from the drive. If
power is removed from the drive while a tape is being read and power cannot be
restored, the cartridge must be removed by a trained service provider.
Typical and Maximum Unload Times
The ACL has the following typical and maximum unload times:
•
Typical unload time: 115 seconds
•
Typical unload time with cleaning cycle: 230 seconds
•
Maximum unload time with cleaning cycle: 720 seconds
The unload or reload time is the elapsed time from the moment you press UNLOAD on
the ACL front panel to the moment the drive is READY. These times include the typical
rewind times of up to 60 seconds for the 5190 tape drive and anywhere from a
maximum of 120 seconds to 1 second for the 5194 tape drive (depending on the type
of tape and tape position). The maximum unload or reload time includes the time it
takes for cleaning cycles and retries caused by unsuccessful load operations.
Rewinding a Tape to BOT
The tape position LEDs on the ACL control panel indicate whether a tape needs to be
rewound. The 5190 and 5194 tape drives automatically rewind the tape before
unloading a cartridge. Typically an application program sends a command to rewind
and unload the tape cartridge at the end of a job. However, at times, you might need
to rewind a tape manually.
Use the following procedure to rewind a cartridge tape without unloading the cartridge.
The procedure assumes that a cartridge is loaded in the drive and that the tape
position is past BOT. To rewind and unload a cartridge, see Unloading Cartridges on
page 4-25.
1. Press the RESET button. The message panel shows NT RDYU or NT RDYF.
2. Press the START button. During rewinding, the message panel shows
REWINDNG.
3. If you receive an error message or check code, see Responding to Error
Messages and Check Codes on page 4-31.
Caution. Do not pull a cartridge out of the drive if it is stuck. Doing so could damage the tape
or the tape-reading mechanism.