Quantum 1200 Series DAT Autochanger Betriebsanweisung PDF herunterladen (Seite 239)

SDLT 600 SCSI Interface Guide Chapter 4: SCSI Commands

81-81200-02 REV A01 January 2005 4-197

If LongID is set to 1 and Extent is set to 0, the parameter list length is 8 bytes and the parameter list has

the following format.

Figure 4-105. RELEASE (10) ID Only Parameter List — Data Format

Table 4-114. RELEASE (10) Command — Field Descriptions

Field Name Description

3rdPty Third Party Release allows an initiator to release a previously reserved logical

unit. When set to 0, third-party release is not requested. When set to 1, the

drive releases the specified logical unit, but only if the initiator ID, 3rdPty bit,

and Third Party Device ID are identical to those of the RESERVE command

that established the reservation.

LongID When set to 1, the Parameter List Length is 8 and the 8 bytes of the parameter

list carry the device ID of the third-party device. The drive ignores the contents

of the Third Party Device ID in the CDB (byte 3).

Extent The drive supports reservations only on entire logical units. Must be set to 0.

Reservation

Identification

The drive ignores the value in this field.

Third Party

Device ID

If the Third Party Device ID value that is connected with the reservation

release is less than 255, the LongID bit may be set to 0 and the ID value can

be sent in the CDB. If the LongID bit is set to 0, the Parameter List Length

field must also be set to 0. If the Third Party Device ID value is greater than

255, the LongID bit must be set to 1.

Parameter

List Length

The contents of this field specify the length, in bytes, of the parameter list

transferred from the initiator to the drive.

Note: Assuming that the RELEASE CDB is valid, the drive always returns GOOD status for

this command. An actual release only happens if the initiator has the drive reserved for

itself or a third-party initiator.

Bit

Byte

7 6 5 4 3 2 1 0

0 - 7

(MSB)

Third Party Device ID

(LSB)

1 2 ... 234 235 236 237 238 239 240 241 242 243 244 ... 293 294

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Quantum 1200 Series DAT Autochanger Betriebsanweisung Seite 239