## Increasing the CAA node_timeout parameter 

Example 8-9 shows how to increase the CAA node_timeout  parameter to prevent a CAA DMS trigger if the LPM freeze time is longer than its timeout. You must run this command on only one node because it is cluster-aware. 

AIX720_LPM1:/ # clmgr -f modify cluster HEARTBEAT_FREQUENCY="600" 1 tunable updated on cluster LPMCluster. AIX720_LPM1:/ # clctrl -tune -L NAME DEF MIN MAX UNIT SCOPE ENTITY_NAME(UUID) CUR ... node_timeout 20000 10000 600000 milliseconds c n LPMCluster(11403f34-c4b7-11e5-8014-56c6a3855d04) 600000 

Note:  With the previous configuration, if the LPM freeze time is longer than 600 seconds, CAA DMS is triggered because of the CAA deadman_mode=a  (assert) parameter. The node crashes and its RG is moved to another node. 

Note:  The -f  option of the clmgr  command means not to update the HACMPcluster Object Data Manager (ODM) because it updates the CAA parameter ( node_timeout ) directly with the clctrl  command. This function is included with the following interim fixes: 

GLYPH<SM590000> PowerHA SystemMirror Version 7.1.2 - IV79502 (SP8) 

GLYPH<SM590000> PowerHA SystemMirror Version 7.1.3 - IV79497 (SP5) 

If you do not apply one of these interim fixes, then you must perform the following steps to increase the CAA node_timeout  variable (Example 8-10): 

1. Change the PowerHA service to the online  status (because cluster sync needs this status). 

2. Change the HACMPcluster ODM. 

3. Perform cluster verification and synchronization. 

4. Change the PowerHA service to the unmanage resource group  status. 

--> Step 1 AIX720_LPM1:/ # clmgr start node AIX720_LPM1 WHEN=now MANAGE=auto Adding any necessary PowerHA SystemMirror entries to /etc/inittab and /etc/rc.net for IPAT on node AIX720_LPM1. AIX720_LPM1: start_cluster: Starting PowerHA SystemMirror ... "AIX720_LPM1" is now online. Starting Cluster Services on node: AIX720_LPM1 This may take a few minutes. Please wait... AIX720_LPM1: Jan 27 2018 06:17:04 Starting execution of /usr/es/sbin/cluster/etc/rc.cluster AIX720_LPM1: with parameters: -boot -N -A -b -P cl_rc_cluster AIX720_LPM1: AIX720_LPM1: Jan 27 2018 06:17:04 Checking for srcmstr active... AIX720_LPM1: Jan 27 2018 06:17:04 complete. 

