The Split-Brain Problem

• What happens if the network connectivity between the active-node and passive node is down?
• The active-node still works, the passive node will try to take over the resources, and we'll have two active nodes, corrupting the data on the disks.
• To solve this, clusters use I/O fencing.
• One common method of fencing, is using SCSI reservation. Another common method is STONITH.

Originally written by guy keren