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

• 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 any 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