FC-AL Features
48 SL500: Interface Reference Manual • July 2008 Revision: F • 96122
Loop Initialization Soft Assigned
StorageTek libraries support the process of Loop Initialization Soft Assigned (LISA)
addresses. This process is supported when the hard-assigned address has been
used by a different device or the hard-assigned addressing is disabled.
Failure to Obtain a Loop Address
If an NL_Port is unable to obtain an address (fabric assigned, previously assigned,
hard assigned, or soft assigned), it goes into a non-participating mode and
immediately implicitly logs out all NL_Ports.
If an NL_Port experiences a power-on reset or recognizes a LIP(AL_PD,AL_PS), it
is not required to retain a previously acquired address to use during the next loop
initialization.
Open State/Loop Initialization
The open initializing (OPEN-INIT) state performs the process of loop initialization.
When ports are in this state, initialization frames are transmitted and received to
identify the temporary loop master and to assign AL_PA values. Entering this state
assumes the loop is operational and sets the Available BB_Credit equal to zero. (See
“Login_BB_Credit Equals Zero” on page 51.)
Related Processes
The following processes might occur during initialization.
Loop Initialization Select Master
StorageTek libraries support the process of selecting a Loop Initialization Select
Master (LISM) by using the device with the lowest port address.
Note – If an FL_Port (fabric loop attachment) is present, it assumes the role of
Loop Initialization Select Master.
Loop Initialization Report Position
StorageTek libraries support the mapping process to build a map of the AL_PA
values according to the library’s position on the loop. The temporary loop master
begins the procedure to create a Loop Initialization Report (LIRP).
This initialization report and map is done by using a 1-word frame identifier with
an offset value of one (1). As the frame is transmitted around the loop, the next
NL_Port increments the offset by a value of one and stores the information in the
AL_PA map.
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