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SCSI Commands

Quantum DLT 8000 Tape System 5-139

PERSISTENT RESERVATION IN Command (5Eh) (continued)

Table 5–63 PERSISTENT RESERVATION IN Read Reservations Descriptor — Field Descriptions

Data Field Description

Reservation Key

The Reservation key field contains an 8-byte value that identifies the reservation

key under which the persistent reservation is held.

Scope-Specific

Address

If the Scope field (Byte 13, bits 4 – 7) represents an “Extent” reservation, the

Scope-Specific Address field contains the logical block address (LBA) of the first

block of the extent and the Extent Length field (Bytes 14 – 15) contains the

number of blocks in the extent.

If the Scope field represents an “Element” reservation, the Scope-Specific

Address field contains the Element address, zero-filled in the most significant

bytes to fit the field and the Extent Length field is set to zero.

Scope The value in this field indicates whether a persistent reservation applies to an

entire logical unit, to a part of the logical unit (defined as an extent), or to an

element.

The values for the Scope field are:

Code Name Description

0h LU Logical Unit. Persistent reservation applies to the

full logical unit. The LU scope is therefore

implemented by all device servers that implement

PERSISTENT RESERVATION OUT.

1h Extent Persistent reservation applies to the specified

extent. When Extent is the scope, it indicates that

the persistent reservation applies to the extent of

the logical unit defined by the Scope-Specific

Address and Extent Length fields in the

PERSISTENT RESERVATION OUT command’s

parameter list. Note that an extent is defined only

for devices defining contiguous logical block

addresses. The Extent scope is optional for all

device servers that implement PERSISTENT

RESERVATION OUT.

2h Element Persistent reservation applies to the specified

element. When Element is the scope, it indicates

that the persistent reservation applies to the

element of the logical unit defined by the Scope-

Specific Address field in the PERSISTENT

RESERVATION OUT parameter list. An element is as

defined by the SCSI-3 Medium Changer

Commands (SMC) standard. The Element scope is

optional for all device servers that implement

PERSISTENT RESERVATION OUT.

3h – Fh Reserved Reserved

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