Compaq Armada 6500 Compaq Storage Hub 12 Management Utilities Hardware and Sof - Page 32

Primitives, Source/Destination Pairs

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Managing from Hub 12 Management Utilities GUI Menu Screen 2-9 Figure 2-7. Setting Network Utilization Alert Source/Destination Pairs This window lists the devices that are talking to each other on the loop. Devices that are communicating with each other are listed by AL_PAs. In some cases it may appear that devices are talking to themselves. This is a result of the use of "half-duplex" Opens to initiate conversations on the loop. If a half-duplex Open is used, then the device initiating the conversation does not place its address in the Open request. Consequently, the destination address appears twice in the Open request. If devices use full-duplex Opens to initiate conversations, then the actual source and destination addresses will appear in this window. Primitives The third tab window of the Network Properties is shown in the figure below. It is a count of the number of times each of the indicated Fibre Channel primitives has been executed since HMU has been started or since the appropriate reset button has been pressed. Counts can be reset globally well as individually. There are four primitives that can be disruptive if an aberrant device creates a continuous stream. All three types of LIPs as well as the NOS/OLS primitives can occur continuously; if they do, there is a problem somewhere in the network. If the LED-like indicator to the left of any of these four items lights up, it is a signal to begin an immediate search for the problem.

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Managing from Hub 12 Management Utilities GUI Menu Screen
2-9
Figure 2-7. Setting Network Utilization Alert
Source/Destination Pairs
This window lists the devices that are talking to each other on the loop.
Devices that are communicating with each other are listed by AL_PAs. In
some cases it may appear that devices are talking to themselves. This is a
result of the use of "half-duplex" Opens to initiate conversations on the loop. If
a half-duplex Open is used, then the device initiating the conversation does not
place its address in the Open request. Consequently, the destination address
appears twice in the Open request. If devices use full-duplex Opens to initiate
conversations, then the actual source and destination addresses will appear in
this window.
Primitives
The third tab window of the
Network Properties
is shown in the figure
below. It is a count of the number of times each of the indicated Fibre Channel
primitives has been executed since HMU has been started or since the
appropriate reset button has been pressed. Counts can be reset globally well as
individually.
There are four primitives that can be disruptive if an aberrant device creates a
continuous stream. All three types of LIPs as well as the NOS/OLS primitives
can occur continuously; if they do, there is a problem somewhere in the
network. If the LED-like indicator to the left of any of these four items lights
up, it is a signal to begin an immediate search for the problem.