Was trying to simulate the "Corosync main process was not scheduled for xx ms" issue. Have a 2 node cluster with with a clone resource(Master-Slave).
*TEST #1* Initially state of cluster resource: NodeA - Master NodeB - Slave Current DC - NodeA Now I freeze the corosync main process on the Master using command : # kill -STOP $(pidof corosync) State of cluster resource: NodeA - Master NodeB - Master Current DC - NodeA NodeB Now continue the corosync process on the Master : # kill -CONT $(pidof corosync) State of cluster resource: NodeA - Master NodeB - Slave Current DC - NodeA *TEST #2* Did the same test with the below initial state of cluster resource: NodeA - Slave NodeB - Master Current DC - NodeA The final state in this case: NodeA - Master NodeB - Slave Current DC - NodeA In 1st test NodeA started as Master and ended as Master. In 2nd test NodeB started as Master and ended as Slave. NodeA is the current DC in both the tests. The behavior is not well defined in these tests. This is always reproducible. Cluster Properties: cluster-infrastructure: corosync cluster-name: APPHA cluster-recheck-interval: 2s dc-deadtime: 5 dc-version: 1.1.16-12.el7-94ff4df have-watchdog: false load-threshold: 1000% no-quorum-policy: ignore start-failure-is-fatal: false stonith-enabled: false Resource properties: Operations: demote interval=0s timeout=30 (APPHA-demote-interval-0s) monitor interval=1 role=Master timeout=40 (APPHA-monitor-interval-1) monitor interval=2 role=Slave timeout=40 (APPHA-monitor-interval-2) promote interval=0s timeout=30 (APPHA-promote-interval-0s) start interval=0s timeout=180 (APPHA-start-interval-0s) stop interval=0s timeout=180 (APPHA-stop-interval-0s) Versions of the rpms installed: pacemaker-cli-1.1.16-12.el7.x86_64 resource-agents-3.9.5-105.el7.x86_64 pacemaker-libs-1.1.16-12.el7.x86_64 pacemaker-cluster-libs-1.1.16-12.el7.x86_64 pcs-0.9.158-6.el7.centos.x86_64 corosync-2.4.0-9.el7.x86_64 pacemaker-1.1.16-12.el7.x86_64 corosynclib-2.4.0-9.el7.x86_64 Linux ditro : CentOS Linux release 7.4.1708 (Core) Regards, Abhay
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