
17-2
SCSI REFERENCE 1014826
CHAPTER 17—RELEASE (17h OR 57h)
17.1 ABOUT THIS COMMAND
The library supports both the six-byte and the ten-byte format of the RELEASE
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.
The RELEASE command enables you to release reservations of the library that
you made with the RESERVE (16h or 56h) command. For information on the
RESERVE command, see Chapter 20.
Only the initiator that reserved the library can release the reserved library. If
another initiator attempts to release a reserved library, the library returns
Good status and does not release the library.
Releasing an unreserved library is not an error.
17.2 WHAT YOU SEND TO THE LIBRARY
17.2.1 SIX-BYTE CDB (PAGE CODE 17h)
Use the six-byte CDB if you want to release reservations for the library.
17.2.2 TEN-BYTE CDB (PAGE CODE 57h)
Use the ten-byte CDB if you want to release reservations for the library.
Byte 01, Bit 4 – 3rdPty
Only a value of 0 is supported.
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 0.
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