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100

101

SCSI-2 Drive Command Set

Reserve Command (16H)

Chapter 22-52

Reserve Command (16H)

This command is used to reserve the drive for use by a single SCSI

initiator if and when the drive is connected to multiple initiators.

The reservation is effective until one of the following occurs:

• The Reserve initiator sends another valid Reserve Command

• The Reserve initiator releases using a Release Command

• Any initiator sends a Bus Device Reset message

• A Reset conditions occurs

Once RESERVED, other initiator commands (except Inquiry and

Request Sense) for the logical unit are rejected and result in a

"Reservation Conflict" status. A Release Command sent by another

initiator is ignored.

3rdPty A 3rd Pty bit of 1 indicates that the drive is reserved for

the SCSI device specified in the Third Party Device ID

field.

3rd Pty

Device ID 3rd Pty Device ID indicates identification of the SCSI

device for which the drive is to be reserved.

Table 2-45 Reserve Command CDB

Byte 7 6 5 4 3 2 1 0

0 Operation Code (16H)

1 Logical Unit Number

(0)

3rd

Pty

3rd Party Device ID Rsvd

(0)

2 Reserved (0)

3 Reserved (0)

4 Reserved (0)

5 Reserved (0) Flag Link

1 2 ... 84 85 86 87 88 89 90 91 92 93 94 ... 377 378

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