Best practice, Sample configurations – HP StoreVirtual 4000 Storage User Manual
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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.
summarizes common Multi-Site SAN and manager configurations.
Table 2 Common configurations of Multi-Site SANs and mangers
Site types
Failover Manager
Total number of
managers of all types
Cluster/site setup
Number of sites
All sites are peer.
In the third site
Min = three; Max =
five
Cluster spans two sites
three physical sites
All sites are peer.
In the logical third site
Min = three; Max =
five
Cluster spans two sites
two physical sites,
with logical third site
All sites are peer.
Not used
Min = three; Max =
six
Cluster spans three
sites
three physical sites
One site is designated
primary.
Not used
Min = three; Max =
five
Cluster spans two sites
two 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 (
“Three physical sites: cluster spans two sites, Failover Manager in third site”
). The one exception to this rule is the two-site configuration in which one site is configured
as primary (
“Two physical sites: cluster spans two sites, one site is the primary site” (page 9)
). In
this case, run a majority of the managers in the primary site.
Sample configurations
The following diagrams illustrate best practice for four different configurations:
•
“Three physical sites: cluster spans two sites, Failover Manager in third site” (page 8)
•
•
“Three physical sites: cluster spans three sites” (page 9)
•
“Two physical sites: cluster spans two sites, one site is the primary site” (page 9)
Designing a Multi-Site SAN
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