Designing Disaster Tolerant High Availability Clusters, 10th Edition, March 2003 (B7660-90013)

Building an Extended Distance Cluster Using MC/ServiceGuard
Two Data Centers and Third Location Architectures
Chapter 2 61
* Configurations with two arbitrators are preferred because they provide
a greater degree of availability, especially in cases when a node is down
due to a failure or planned maintenance. It is highly recommended that
two arbitrators be configured in Data Center C to allow for planned
downtime in Data Centers A and B.
The following is a list of recommended arbitration methods for
MetroCluster solutions in order of preference.
• 2 arbitrator nodes, where supported
• 1 arbitrator node, where supported
5 5 1 Arbitrator
Node
A.11.13 or later
5 5 2* Arbitrator
Nodes
A.11.13 or later
55Quorum
Server System
A.11.13 or later
6 6 1 Arbitrator
Node
A.11.13 or later
6 6 2* Arbitrator
Nodes
A.11.13 or later
66Quorum
Server System
A.11.13 or later
7 7 1 Arbitrator
Node
A.11.13 or later
7 7 2* Arbitrator
Nodes
A.11.13 or later
77Quorum
Server System
A.11.13 or later
88Quorum
Server System
A.11.13 or later
Table 2-2 Supported System and Data Center Combinations (Continued)
Data Center
A
Data Center
B
Data Center
C
ServiceGuard
Version