User's Guide

86 SCSI Commands

Reserve Element - 16h

What the Library Does With This Command

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.

Command Usage

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.

Reserve Element CDB Format

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

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.

Table 82 RESERVE ELEMENT CDB format

Bit

Byte

76543210

0 Op Code (16h)

1 Logical Unit Number

3rd

Party

Third Party Device ID

Element

2 Reservation ID

Reserved

5 Control