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4.1 Control/Sense Commands
C141-C013 199
• Persistent reservations scope
The value in the "Scope" field shall indicate whether a persistent reservation
applies to an entire logical unit or to an element. The values in the "Scope" field
are defined in Table 4.28.
Table 4.28 Persistent reservations scope
Code Name Description
0h Logical Unit Persistent reservation applies to the full logical unit
1h Reserved Reserved
2h Element
(not supported)
Persistent reservation applies to the specified element
3h-Fh Reserved Reserved
a) Logical unit scope
A "Scope" field value of LU shall indicate that the persistent reservation
applies to the entire logical unit. A drive that supports PERSISTENT
RESERVE OUT must also support the Logical Unit scope.
b) Element scope (not supported)
This "Scope" field value indicates that reservation has been applied to the
element specified in the "Scope-specific Address" field of the PERSISTENT
RESERVE OUT parameter list. The support of Element Scope is optional.
• Persistent reservations type
The "Type" field value defines the reserve attribute applied to the data block in
the logical unit. Table 4.29 shows the characteristics of each of the type codes.
The codes for each of the types and the drives that support such codes are
explained in the table. The requirements of the drives indicated in the table are
divided into two separate categories. The first paragnaph defines the required
handling for read operation. The second paragraph defines the required handling
for write operations.