Since an AWS environment does not support shared disk configurations, SCSI reservations cannot be used to prevent split brain scenarios. For this reason, consider using the Quorum/Witness Server or STONITH, LifeKeeper’s I/O fencing functionality, to operate more safely with this configuration.
Quorum fencing functionality can be easily configured in cloud environments by using the TCP_REMOTE Quorum mode, instead of setting up a separate Quorum server. For details, please see the URL below
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