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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:
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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