A quorum disk is an MDisk or a managed drive that
contains a reserved area that is used exclusively for system management.
A system uses a quorum disk for two purposes:
- To break a tie when a SAN fault occurs, when exactly half of the nodes that were previously a
member of the system are present.
- To hold a copy of important system configuration data. Just over 256 MB is reserved for this
purpose on each quorum disk candidate.