
20-2
SCSI REFERENCE 1014826
CHAPTER 20—RESERVE (16h OR 56h)
Note: The RESERVE and RELEASE commands, while targeting the library, are
actually specified by the ADI and handled by the tape drive.
For additional information, see:
The tape drive Product Manual
The Automation/Drive Interface - Command (ADC)
20.1 ABOUT THIS COMMAND
The RESERVE command allows the initiator to reserve the library. The tape
drive must be reserved separately.
The library supports both the six-byte and the ten-byte format of the RESERVE
UNIT CDB. The library determines which version of the command is being
used based on the operation code in the CDB. You can use either version of the
command.
Reservations can be released with a RELEASE (17h or 57h) command from the
same initiator (see Section 17.1 on page 17-2), a reset, or a power-on of the
library.
Notes:
If the library is reserved as a unit, the library processes only the following
commands from another initiator:
INQUIRY
RELEASE
REQUEST SENSE
PREVENT/ALLOW MEDIUM REMOVAL with Prevent=00b
All other commands result in a Reservation Conflict (18h) status.
20.2 WHAT YOU SEND TO THE LIBRARY
20.2.1 SIX-BYTE CDB (PAGE CODE 16h)
Use the six-byte CDB if you want to reserve the library.
20.2.2 TEN-BYTE CDB (PAGE CODE 56h)
Use the ten-byte CDB if you want to reserve the library.
LongID – Byte 01, Bit 1
The value for this field must always be 0, indicating that the library does not
support device IDs greater than 255.
Byte 03 – Third Party Device ID
This field is not supported and must be set to 0.
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