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Operating Systems AIX Crash dump and Panic message : RSCT Dead Man Switch Timeout for HACMP; halting non-responsive node Post 303042416 by zxmaus on Tuesday 24th of December 2019 01:08:46 AM
Old 12-24-2019
You lost all heartbeats from node 1 to node 2 - thats the reason for the crash. This might happen when your system is simply too busy - but since you should have both heartbeat on disk and heartbeat via network, you should think that there is time enough to send at least one every couple of seconds, Your cluster heartbeat settings might be too tight - giving it more time for the heartbeat might help preventing this issue in the future.
Just out of curiosity - using GPFS and HACMP and RAC on the same systems appears to me to be a completely unnecessary setup, as you are running essentially 3 different cluster products on a system when RAC alone would suffice. Why ?
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HB_STANDBY(1)							 General commands						     HB_STANDBY(1)

NAME
hb_standby - issues a failover request to the cluster manager SYNOPSIS
hb_standby [all|foreign|local|failback] DESCRIPTION
Warning This command is deprecated. It is only suitable for legacy Heartbeat clusters without Pacemaker enabled. In Pacemaker-enabled clusters, the crm(8) shell supports switching individual nodes into standby mode, and replaces hb_standby. /usr/share/heartbeat/hb_standby issues a request to the cluster to move resources from the node where it is invoked, to the other node (if it is currently available). The meaning of the options is relative. This manual assumes the following configuration to be present in /etc/ha.d/haresources: alice drbddisk::r0 Filesystem::/dev/drbd0::/local/groups::ext3 10.0.0.1 smb bob drbddisk::r1 Filesystem::/dev/drbd1::/local/ldap::ext3 10.0.0.2 ldap OPTIONS
The following options are supported: local Migrates any resources that the local node is the preferred node for. When invoked on alice, Samba would be shut down, the IP address 10.0.0.1 would be released, /local/groups would be unmounted, /dev/drbd0 would be placed into the secondary role and bob would take all these services over. When run on bob, OpenLDAP would shut down, 10.0.0.2 would be released, /local/ldap would be unmounted, /dev/drbd1 would be placed into the Secondary role and alice would take over all these services. foreign|failback Migrates any resources that the local node is not the preferred node for. When run on alice, OpenLDAP would shut down, 10.0.0.2 would be released, /local/ldap would be unmounted, /dev/drbd1 would be placed into the Secondary role and bob would take over all these services. When invoked on bob, Samba would be shut down, the IP address 10.0.0.1 would be released, /local/groups would be unmounted, /dev/drbd0 would be placed into the secondary role and alice would take all these services over. all Migrates all resources to the other node. Invoking hb_standby without any options is identical to hb_standby all. CAVEATS
hb_standby is only usable in R1-style configurations (i.e., those configured using the haresources file). SEE ALSO
hb_takeover(1), heartbeat(8), cl_status(1) AUTHORS
Alan Robertson <alanr@unix.sh> hb_standby Guochun Shi <gshi@ncsa.uiuc.edu> man page Florian Haas <florian.haas@linbit.com> man page Heartbeat 3.0.5 November 26, 2009 HB_STANDBY(1)
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