User Manual

SCSI Commands Reference Manual, Rev. J 436
www.seagate.com Parameters for direct access devices
PROTOCOL IDENTIFIER field
The value in the PROTOCOL IDENTIFIER field defines the SCSI transport protocol to which the mode page applies. For a MODE SENSE command
(see 3.11), the device server shall set the PROTOCOL IDENTIFIER field to one of the values shown in Clause 5.3.23 to indicate the SCSI transport
protocol used by the target port through which the MODE SENSE command is being processed. For a MODE SELECT command (see 3.9), the
application client shall set the PROTOCOL IDENTIFIER field to one of the values shown in Table 408 indicating the SCSI transport protocol to
which the PROTOCOL SPECIFIC MODE PARAMETERS apply. If a device server receives a mode page containing a transport protocol identifier
value other than the one used by the target port on which the MODE SELECT command was received, then the command shall be terminated
with CHECK CONDITION status, with the sense key set to ILLEGAL REQUEST, and the additional sense code set to INVALID FIELD IN PARAMETER
LIST.
DTFD (Disable Target Fabric Discovery)
1 The target attached by an FC-AL loop will not recognize the presence of a fabric loop port (FL_Port) on the loop. The target will only per-
form the private loop functions defined for FC-PLDA targets.
0 The target attached by an FC-AL loop will discover the FL_Port if present on the loop and will perform the public loop functions defined
for FC-FLA targets. Targets attached to an N_Port or to an F_Port will ignore this bit.
PLPB (Prevent Loop Port Bypass)
1 The target ignores any Loop Port Bypass (LPB) and Loop Port Enable (LPE) primitive sequences. The loop port remains enabled.
Note. Do not set the PLPB bit to one (1) and the DTIPE bit to one (1) at the same time as this is an illegal bit combination. When an illegal bit
combination is sent by the application client, the device server returns Check Condition status and sets the sense key to Illegal Request
with the additional sense code set to Invalid Field in the Parameter List.
0 The target allows the Loop Port Bypass and Port Bypass Enable primitive sequences to control the port bypass circuit.
DDIS (Disable Discovery)
1 The target does not require receipt of Address or Port Discovery ELS following loop initialization. The target resumes processing of tasks
upon completion of loop initialization.
0 The target must wait to receive an Address or Port Discovery ELS before it resumes processing tasks for that initiator.
DLM (Disable Loop Master)
1 Indicates that a target attached to an FC-AL-2 loop shall not participate in loop master arbitration and shall not become loop master. The
target shall only repeat LISM frames it receives.
0 The target may participate in loop master arbitration in the normal manner and, if successful, may become loop master during the loop
initialization process. Targets not attached to an arbitrated loop shall ignore the DLM bit.
REQUIRE HARD ADDRESS (RHA) bit - formerly DSA bit
1 If the REQUIRE HARD ADDRESS (RHA) bit is set to one, a target FCP_Port attached to an arbitrated loop (see FCAL-2) shall only attempt to
obtain its hard address available in the SCA-2 connector (see SFF-8067) or device address jumpers during loop initialization.
The target FCP_Port shall not attempt to obtain an address during the LISA phase of initialization (see FC-AL-2). If there is a conflict for the hard
address selection during loop initialization or the target FCP_Port does not have a valid hard address available, the target FCP_Port shall enter
the nonparticipating state. If the target FCP_Port detects loop initialization while in the nonparticipating state, the target FCP_Port shall again
attempt to get its hard address. If the hard address has not changed from the address obtained in a previous successful loop initialization, the
target FCP_Port shall attempt to obtain the address in the LIFA phase if a valid Fabric Login exists or LIPA phase of loop initialization. If the hard
address has changed, the target FCP_Port shall attempt to obtain the new address in the LIHA phase.
0 If the RHA bit is set to zero, the target FCP_Port follows the normal initialization procedure, including the possibility of obtaining a soft
address during the loop initialization process.
Target FCP_Ports not attached to an arbitrated loop shall ignore the RHA bit.