FC-4 (FCP) Features
96122 • Revision: F Chapter 5 Fibre Channel Operations 69
FC-4 (FCP) Features
Fibre Channel Protocol (FCP) provides functions such as login and logout
parameters and the transfer of commands and data through the use of Information
Units. The FCP command set for the libraries is SCSI-3.
Note – Refer to Chapter 6, “SCSI Commands” or more information about the
implementation of the SCSI-3 command set.
FCP Process Login Parameters
TABLE 5-19 lists Process Login (PRLI) parameters supported:
TABLE 5-19 PRLI Parameters
Feature
FC-Tape
StorageTekInitiator Target
Command + Data in same Sequence (Write) = 1 P P N
Data Overlay Allowed = 1 (see note) I R Y
Data + Response in same Sequence (Read) = 1 P P N
Establish Image Pair (bit 13) = 0 I R Y
Establish Image Pair (bit 13) = 1 R R Y
SRR/REC Recovery Supported = 1 AR N
Confirmed Completion Allowed =1 I R Y
Initiator Function =1 R A N
Originator Process Associator P P N
Originator Process Associator Valid = 1 P P N
Responder Process Associator P P N
Responder Process Associator Valid = 1 P P N
Read XFER_RDY Disabled = 1 R R Y
SCSI Target Function = 1 A R Y
Write XFER_RDY Disabled = 1 P P N
Note: If the initiator requests it, the use of data overlay is only allowed in response to an SRR
(such as with error recovery).
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