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12 Reserve—16h
Command Description
The RESERVE command allows the initiator to reserve either the whole library or specific
elements. Reserving the whole library or a specific element will prevent another user
from moving media to the import/export element (the TAP) of the library via the
library's control panel.
The elements reserved are released as a result of a RELEASE (17h) command from the
same initiator, a bus device reset condition, a SCSI bus reset, or power-cycling the
library.
The RESERVE command may be used to modify or supersede a previous reservation by
the same initiator. If the superseding reservation does not result in any reservation
conflicts or error conditions, the new reservations are completed and the previous
reservation released.
The table below shows the CDB for the RESERVE command.
Table 12-1: Reserve Command–16h
Bits
Byte
7
00
01
02
03
(MSB)
04
05
a.
These bits are ignored.
6
5
4
Operation Code (16h)
a
Obsolete
Element List Length
3
2
Obsolete
Reservation ID
Control
57
1
0
Element
(LSB)
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