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What's in an HA system?
Membership services
Communication services
Cluster "manager"
Resource Monitoring
Storage
- Journalling Filesystem
- (or) Cluster Filesystem
- Volume Manager (with snapshots)
- (either) Shared Storage (SCSI or FC)
- (or) Replicated Storage (DRBD, NBD, etc.)
Resource (I/O) Fencing
Notes: