5.2.7 How to Change Public Network Management Tunable Parameters

There are four tunable parameters in this algorithm: inactive_time, ping_timeout, repeat_test, and slow_network. These parameters provide an adjustable trade-off between speed and correctness of fault detection. See Table 5-3 for more information.

Use this procedure to change the default Public Network Management (PNM) values for the pnmd(1M) daemon.

1. Become superuser on a node in the cluster.

2. If it doesn't already exist, create the pnmparams file.

   # vi /etc/cluster/pnmparams

3. Use the following table to set PNM parameters.

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   Note -

   Settings in the /etc/cluster/pnmparams file apply to all NAFO groups on the node. Lines started with a pound sign (#) are ignored. Other lines in the file must be of the format: variable=value.

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   Table 5-3 Public Network Management Tunable Parameters

   Parameter	Description
   inactive_time	Number of seconds between successive probes of the packet counters of the current active adapter. Default is 5.
   ping_timeout	Time-out value in seconds for the ALL_HOST_MULTICAST and subnet broadcast pings. Default is 4.
   repeat_test	Number of times to do the ping sequence before declaring that the active adapter is faulty and failover is triggered. Default is 3.
   slow_network	Number of seconds waited after each ping sequence before checking packet counters for any change. Default is 2.
   warmup_time	Number of seconds waited after failover to a backupadapter before resuming fault monitoring. This allows extra time for any slow driver or port initialization. Default is 0.

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   Note -

   The changes don't take affect until the next time the pnmd daemon starts up.

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5.2.7.1 Example--Changing Public Network Management Tunable Parameters

The following shows a sample/etc/cluster/pnmparams file, with two parameters changed from their default values.

inactive_time=3
repeat_test=5