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In addition to setting up the Multi-Site clusters for data replication, it is important to set up the SAN
managers for quorum correctly to ensure that in the event of a failure the system can be properly
recovered. Maintaining quorum can be either an automated process or manually recovered by an
Administrator. Table 2 (page 13) summarizes common Multi-Site SAN and manager configurations.
Table 2 Common configurations of Multi-Site SANs
Site typesFailover ManagerTotal number of
managers of all types
Cluster/site setupNumber of sites
All sites are peer.In the third siteMin = three
Max = five
Cluster spans two sitesThree physical sites
All sites are peer.In the logical third siteMin = three
Max = five
Cluster spans two sitesTwo physical sites,
with logical third site
All sites are peer.Not usedMin = three
Max = five
Cluster spans three
sites
Three physical sites
One site is designated
primary.
Not usedMin = three
Max = five
Cluster spans two sitesTwo physical sites
Best practice
In a cluster that spans multiple sites, run the same number of managers in each site. In a cluster
that spans two sites, run a Failover Manager in a third site (physical or logical) that is not included
in the cluster (Figure 10 (page 13)). The one exception to this rule is the two-site configuration in
which one site is configured as primary (Figure 13 (page 15)). In this case, run a majority of the
managers in the primary site.
Sample configurations
The following diagrams illustrate the best practices for four different configurations.
Figure 10 Three physical sites: cluster spans two sites, Failover Manager in third site
1. Volumes are configured with Network RAID-10
Configuring sites and managers to achieve optimal high availability and redundancy 13