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252 Fibre Channel Interface Manual, Rev. D
Reservation Key
The reservation key is the registered reservation key under which the reservation is held. If initiators use unique keys, the
application should be able to associate the reservation key with the initiator that holds the reservation.
Scope
The value in this field specifies whether a persistent reservation applies to an entire logical unit or to an element.
Code Name and Description
0h LU (logical unit). Persistent reservation applies to the full logical unit. The LU scope is implemented by all
device servers that implement Persistent Reserve Out.
1h Obsolete (no longer used).
2h Element. Persistent reservation applies to the specified element of the logical unit defined by the Scope-spe-
cific Address field in the Persistent Reserve out parameter list. An element is defined by the SCSI-3 Medium
Changer Command (SMC) standard. The Element scope is optional for all device servers that implement
Persistent Reserve out.
3h-Fh Reserved.
Scope-specific Address
If the Scope is an Element reservation (2h), this field contains the Element address, zero filled in the most significant bytes
to fit the field. If the Scope is a Logical Unit reservation (oh), this field is set to 0.
Table 165: Persistent Reserve In Reservation Descriptor
Bit
Byte
76543210
0 (MSB)
Reservation Key:
7 (LSB)
8 (MSB)
Scope-specific Address:
11 (LSB)
12
Reserved
13 Scope Type
14 (MSB)
Obsolete (no longer used)
15 (LSB)
165
165
165