Twosites Option

Introduced in release: 8.0

The  Message Store   option  enables two sites replication. When this option is disabled, the Message Store cannot take over as master if the original master fails  in a replication group with only two sites. In the event this happens, the Message Store cluster will be unavailable for write access. A two-site replication group is vulnerable to duplicate masters when there  is a disruption to communications between the sites. You should strongly consider having three or more electable sites in your replication group. All sites in the group must have the same value for this option.

The default value is: 0

See also:
 * Message Store dbreplicate options