Configuring Data Replication For Optimal Availability And Redundancy - HP StoreVirtual 4000 Configuration Manual

Table 3 Common Multi-Site SAN configurations with recommended managers
Multi-Site SAN configuration
Two physical sites, one site is primary
Two physical sites, logical third site
Three physical sites, cluster spans two
sites
Three physical sites

Configuring data replication for optimal availability and redundancy

The SAN/iQ software offers six levels of synchronous replication at a volume level. However, only
three levels are appropriate for Multi-Site SAN configurations.
appropriate data replication levels for the Multi-Site SAN and associated supported configurations.
To protect the data across sites, you must choose a data protection level with a number of mirrors
that is at least equal to the number of sites in the configuration. For example, if the storage cluster
spans three sites, then volumes must be configured as Network RAID–10+1 in order to ensure that
data is the same on each site.
NOTE: Network RAID-0, Network RAID-5, and Network RAID-6 do not tolerate site failures.
16 Designing a Multi-Site SAN
Manager configuration
For four storage systems, run:
Two managers in the primary site
One manager in the secondary site
For six storage systems or more, run:
Three managers in the primary site
Two managers in the secondary site
For two storage systems, run:
One manager in each site
One failover manager in the logical
third site
Two managers in each site, one
failover manager in the logical third
site
For four storage systems or more, run:
Two managers in each site
One failover manager in the logical
third site
For two storage systems, run:
One manager in each site
One failover manager in the third
site
For four storage systems, run:
Two managers in each site
One failover manager in the third
site
For three storage systems, run:
One manager in each site
For six or more storage systems, run:
Three managers in the primary site
Two managers in the secondary site
Number of managers and number
Needed to maintain quorum
Manager count = three
Number for quorum = two
Manager count = five
Number for quorum = three
Manager count = three
Number for quorum = two
Manager count = five
Number for quorum = three
Manager count = three
Number for quorum = two
Manager count = five
Number for quorum = three
Manager count = three
Number for quorum = two
Manager count = five
Number for quorum = three
Table 4 (page 17) describes the