If this fails, the problem is at the hardware or SCSI target level. List all nodes connected to the same LUN:
grep -i "atomic test and set" /var/log/messages dmesg | grep -i "compare.*write\|reservation" journalctl -xe | grep "false for equality" Check for media errors, SCSI command timeouts, or resets: If this fails, the problem is at the
sg_inq /dev/sdX sg_persist -i /dev/sdX # Show all registered initiators For Pacemaker/Corosync: If this fails
If a dead node left a reservation, clear it: SCSI command timeouts
To decode SCSI sense data:
pcs status crm_verify -L -V pcs cluster cib | grep reservation Solution 1: Handle the Failure in Application Logic If the error is expected during leader election, implement proper handling: