Fabric Manager Users Guide, Version 6.1, Revision A - QLogic

3–Fabric Manager Configuration
Configuring the QLogic Fabric Manager
Table 3-11. Congestion Control Parameters (Continued)
Parameter
Default
Value
Description
DiscoveryAttempts 3 The number of attempts made when discovering
whether a node supports Congestion
Control. Increasing this value
increases resiliency, but also increases
the timeout against nodes that do not
support Congestion Control.
DiscoverAlways 0 Allows discovery to occur regardless of
whether CC is enabled or disabled thus
allowing CC to be cleared in a topology
after being disabled.
1 = Enable
0 = Disable
Switch N/A CC settings applicable to all switches.
Default settings for switch are selected to
provide the best congestion control for
various traffic mixes but may require tuning
for best performance. Refer to Congestion
Control Switch Settings for the
switch parameters.
Ca N/A CC settings applicable to third party
channel adapters. When using QLogic
Host Channel Adapters, the settings for
Congestion Control can be configured
with the following environment variables
such as the ones shown here and may
require tuning for best performance
PSM_DISABLE_CCA 0
PSM_CCTI_INCREMENT 1
PSM_CCTI_TIMER 1
PSM_CCTI_TABLE_SIZE 128
Congestion Control Switch Settings
The parameters in Table 3-12 control Congestion Control settings applicable to all
switches. Default settings for a switch are selected to provide the best congestion
control for various traffic mixes but may require tuning for best performance.
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