Fabric Manager Users Guide, Version 6.1, Revision A - QLogic
Fabric Manager Users Guide, Version 6.1, Revision A - QLogic
Fabric Manager Users Guide, Version 6.1, Revision A - QLogic
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2–Advanced <strong>Fabric</strong> <strong>Manager</strong> Capabilities<br />
Multiple <strong>QLogic</strong> <strong>Fabric</strong> <strong>Manager</strong> Instances per Management Host<br />
The long running counters can also be very useful to analyze long term error<br />
rates, using tools such as fabric_analysis, while still providing short term<br />
statistics in iba_top and other tools.<br />
64 Bit PMA Counter Support<br />
The PM can take advantage of 64-bit PMA counters for devices which support<br />
them. It also takes advantage of switches which support the AllPortSelect<br />
mechanism for clearing counters. <strong>QLogic</strong> 12000 series switches running 5.2.0.0.9<br />
or later firmware support both features.<br />
Use of 64-bit counters permits a much longer SweepInterval for the PM and<br />
can reduce the PM contributions to "OS Jitter". Use of 64-bit counters is enabled<br />
by default. The Pm.Pma64Enable configuration parameter can be used to<br />
enable/disable use of 64-bit counters. When enabled the PMA will query the<br />
device, using ClassPortInfo, to determine if it supports 64-bit counters and will<br />
only use 64-bit counters for devices which support them.<br />
Scalable PMA Retries<br />
To optimize fabric programming time, the <strong>QLogic</strong> <strong>Fabric</strong> <strong>Manager</strong> can be<br />
configured to issue multiple PMA packets in parallel. This approach can result in<br />
occasional packet loss which can have a negative effect on PM performance.<br />
To allow for rapid recovery from such packet loss, while not causing excessive<br />
retries to sluggish nodes, the <strong>QLogic</strong> <strong>Fabric</strong> <strong>Manager</strong> allows for scalable retries<br />
which increase with each attempt.<br />
Support for IBM eHCA<br />
Some versions of the IBM eHCA do not fully support a PMA in the Logical<br />
Channel Adapters. The Pm.EhcaPmaAvoid configuration parameter can be used<br />
to disable PMA queries of eHCA Logical Channel Adapters. This will not typically<br />
impact the data available since the neighbor Logical Switch port inside the eHCA<br />
will provide the same data movement information. Since the links between Logical<br />
Channel Adapters and Logical Switches are purely logical, not physical, no signal<br />
integrity errors will be reported for these links. <strong>QLogic</strong> recommends to use the<br />
default of EhcaPmaAvoid=1 to disable these queries and avoid potential<br />
problems.<br />
Multiple <strong>QLogic</strong> <strong>Fabric</strong> <strong>Manager</strong> Instances<br />
per Management Host<br />
Table 2-2 associates managers and their acronyms.<br />
IB0054608-01 B 2-33
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