HP StorageWorks 8B - FC Entry Switch Manual del usuario - Página 23

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HP StorageWorks 8B - FC Entry Switch Manual del usuario

Error Handling

QuickLoop isolates faulty switches or ports by excluding them from the initialization process. This
allows minimization of the impact of a faulty looplet or switch on normal QuickLoop operations,
and is particularly important for QuickLoops that contain multiple looplets distributed across two
switches.

Switch Level Errors

Switch level errors affect dual switch QuickLoops, and include the following conditions:
•
No switch with the configured partner switch's WWN can be found in the fabric.
•
No response is received from the partner switch during the initial handshake.
•
Inconsistent responses are received from the partner switch.
•
Responses are not received in time during QuickLoop initialization.
If one of the above errors is detected on a switch, the partner reinitializes to form a separate
QuickLoop containing only the devices on the partner switch, creating two QuickLoops. If the error
condition is removed, the QuickLoops are reinitialized to form a single QuickLoop. If the recovery
procedure fails, the switches remain in the single switch QuickLoops, and the procedure is
executed again after a time-out period.

Port Level Errors

The following conditions are considered faulty in regards to the related looplet:
•
Any physical level errors occur, such as loss of synchronization or laser fault.
•
The frequency of LIPs received from a port exceeds a threshold.
•
A port fails to become the Loop Initialization Master within a time-out period after LIPs are
either received from or sent to the port.
•
A port does not receive a loop initialization sequence back within a time-out period after the
sequence is sent.
If an error is detected on a looplet, the QuickLoop is reinitialized with the looplet excluded. The
error condition is monitored, and if the condition is removed, the looplet is re-included into the
QuickLoop.
The looplet error recovery procedure includes the following steps:
1.
LIPs are issued to the looplet, and it is determined whether the hidden FL_Port enters
OPEN-INIT and becomes the Loop Initialization Master.
2.
The rest of the standard Loop Initialization Sequences are completed, and it is determined
whether the looplet can be fully initialized within a time-out period.
3.
The looplet is kept idle and it is determined whether it remains stable.
If the procedure fails at any of the above steps, the looplet remains isolated from the QuickLoop,
and the procedure is executed again after the time-out period. If all the steps are successfully
completed, the looplet is reinstated into the QuickLoop by full initialization.
QuickLoop User's Guide
2
Using QuickLoop
2-11