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. 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: 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): GLYPH<SM590000> PowerHA SystemMirror Version 7.1.2 - IV79502 (SP8) GLYPH<SM590000> PowerHA SystemMirror Version 7.1.3 - IV79497 (SP5) 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. 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 Example 8-9 Increasing the CAA node_timeout parameter Example 8-10 Detailed steps to change the CAA node_timeout parameter without a PowerHA interim  fix --> 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. 306  IBM PowerHA SystemMirror V7.2.3 for IBM AIX and V7.2.2 for Linux