Reserve Element (6) - 16h

The library reserves the entire library for the initiator making the request. Only whole logical unit reservations are allowed; individual element reservations are not supported. The reservation remains in effect until either the initiator that made the reservation sends a RELEASE command, or a reset or power-cycle of the library occurs.

This command should be used to reserve the library for extended operations, such as issuing a SEND VOLUME TAG followed by a REQUEST VOLUME ELEMENT ADDRESS sequence. Initiators issuing a RESERVE should follow it with a RELEASE when the extended operation sequence is complete.

The RESERVE ELEMENT CDB format is shown in the following table.

Table 1: RESERVE ELEMENT CDB format

Bit

Byte

7

6

5

4

3

2

1

0

0

Op Code (16h)

1

Logical Unit Number

3rd Party

Third Party Device ID

Element

2

Reservation ID

3

Reserved

4

5

Control
Field Description
3rdPrty

This field is not supported, and must be set to 0.
Third Party Device ID

This field is not supported, and must be set to 0.
Element

This field is not supported, and must be set to 0.
Reservation ID

This field is not supported, and must be set to 0.