Hello! I use Postgresql+Pacemaker+Corosync 3 nodes cluster with 2 Postgresql instances in synchronous replication mode on two high performance nodes and Pacemaker+Corosync on the third low performance node for quorum only. At the same time a SCADA HMI software is running on the high performance nodes. This SCADA software uses its own redundancy technology.
In this case I can't use fencing as usual to power off or reboot a failed node, because the operator will be very surprised when his workstation will be shutted down due to database failure. What type of fencing should I use in this case? On the other hand, Postgresql instances don't use any shared resources. Is it possible to use cluster without fencing in this case? Best regards, Sergey Cherukhin
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