User Manual

SCSI Commands Reference Manual, Rev. J 405
www.seagate.com Parameters for direct access devices
5.3.14 Disconnect-Reconnect mode page (02h) for FC
The Disconnect-Reconnect mode page for FCP (see table 384) allows the application client to modify the behavior of the service
delivery subsystem. This subclause specifies the parameters that are used by FCP devices and defines how FCP devices interpret
the parameters. The application client communicates with the device server to determine what values are most appropriate for a
device server. The device server communicates the parameter values in this mode page to the target FCP_Port, normally the
Fibre Channel interface circuitry. This communication is internal to the SCSI target device and FCP device and is outside the
scope of this manual. If a field or bit contains a value that is not supported by the FCP device, the device server shall return
CHECK CONDITION status. The sense key shall be set to ILLEGAL REQUEST and the additional sense code set to ILLEGAL FIELD IN
PAR AME TER LIST.
An interconnect tenancy is the period of time when an FCP device owns or may access a shared Fibre Channel interconnect. For
arbitrated loops (see FC-AL-2) and Fibre Channel Class 1 connections, a tenancy typically begins when an FCP device successfully
opens the connection and ends when the FCP device releases the connection for use by other device pairs. Data and other
information transfers take place during interconnect tenancies.
Point-to-point or fabric-attached Class 2 or Class 3 links and many other configurations do not have a concept of interconnect
tenancy and may perform transfers at any time.
Table 384 Disconnect-Reconnect mode page (02h)
Bit
Byte
7 6 5 4 3 2 1 0
0 PS SPF (0b) PAGE CODE (02h)
1 PAGE LENGTH (0Eh)
2 BUFFER FULL RATIO
3 BUFFER EMPTY RATIO
4 (MSB)
BUS INACTIVITY LIMIT
5 (LSB)
6 (MSB)
DISCONNECT TIME LIMIT
7 (LSB)
8 (MSB)
CONNECT TIME LIMIT
9 (LSB)
10 (MSB)
MAXIMUM BURST SIZE
11 (LSB)
12 EMDP FAA FAB FAC Restricted Restricted
13 Reserved
14 (MSB)
FIRST BURST SIZE
15 (LSB)