Reserve (10)
96122 • Revision: F Chapter 6 SCSI Commands 225
Reserve (10)
The 10-byte Reserve command (56h) allows the initiator to perform unit
reservations. Unit reservations are reservations of the library as a whole.
Another capability of the Reserve (10) command as opposed to the Reserve (6)
command is the ability to do third party reservations. The third party reservation
allows the reservation of a logical unit within a logical unit on behalf of another
SCSI device.
TABLE 6-95 Reserve (10) Command
Byte
Bit
7654321 0
0Operation Code (56h)
1 Ignored 3rd Pty Reserved LongID
(0)
Obsolete
2Obsolete
3Third Party Device Id
4-6 Reserved
7
to
8
(MSB)
Parameter List Length
(LSB)
9 Control Byte (00h)
Reserve (10) Command Descriptions:
3rd Pty This field indicates whether the reservation is on behalf of a third party or not:
■ 0 = The reservation is on behalf of the calling requester.
■ 1 = The reservation is on behalf of a specified Third party Device Id.
LongID The LongID field indicates whether device IDs greater than 255 are required.
The library only accepts a value of 0. LongIDs are not supported.
Third Party
Device Id
The ID of the third-party device.
Parameter List
Length
This field indicates the length in bytes of the Parameter List that follows the
command.
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