Seagate Fibre Channel Interface - Manual (Page 270)

256 Fibre Channel Interface Manual, Rev. D
12.17.1 Persistent Reserve Out parameter list
The parameter list for the Persistent Reserve Out command is defined in Table 167. All fields are sent on all
Persistent Reserve Out commands, even if the field is not required for the specified service action and scope
values.
Field definitions (listed alphabetically)
APTPL (Activate Persist Through Power Loss)
The APTPL bit is valid only for the Register service action. In all other cases, the APTPL is ignored. Support for
an APTPL bit equal to one is optional. If a device server that does not support the APTPL bit value of one
receives that value in a Register service action, the device server returns a Check Condition status. The sense
key is set to Illegal Request, and additional sense data is set to Invalid Field in the Parameter List.
If the last valid APTPL bit value received by the device server is zero, the loss of power in the target releases
all persistent reservations for all logical units and removes all reservation keys.
If the last valid APTPL bit value received by the device server is one, the logical unit retains all persistent reser-
vations that may be present and all reservation keys for all initiators even if power is lost and later returned.
Table 168 summarizes which fields are set by the application client and interpreted by the device server for
each service action and scope value. Two Persistent Reserve Out parameters (Reservation Key and the
APTPL bit) are not summarized below since they are discussed above.
Table 167: Persistent Reserve Out parameter list
Bit
Byte
7 6 5 4 3 2 1 0
0 (MSB)
Reservation Key :
7 (LSB)
8 (MSB)
Service Action Reservation Key :
15 (LSB)
16 (MSB)
Scope-specific Address :
19 (LSB)
20 Reserved APTPL
21
Reserved
22 (MSB)
Obsolete (no longer used)
23 (LSB)
Table
number
167