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Figure 6 Multi-Site SAN mapping to subnets, VIPs, and application servers
1. Dual redundant GigE links
Connecting volumes to multiple subnets in a Multi-Site SAN using the Microsoft iSCSI initiator
Connecting to volumes in a multiple subnet configuration is similar to connecting to volumes in a
single-site configuration, with the following important differences:
• You must configure all cluster VIPs for discovery, for proper failover/failback configuration of
a Multi-Site SAN. List the VIPs in the preferred order of connection. For example, if Site A is
the first preference for connection, put the VIP associated to Site A first in the discovery list.
• You must also log on to the volumes with the default Target Portal setting.
Using multiple cluster VIPs when connecting to a Multi-Site SAN
Use the Virtual IP address of the cluster when connecting to volumes. In a multiple subnet
configuration, you must enter both of the VIPs of the multi-site cluster on all the application servers.
In addition, all the application servers must have the VIPs listed in the same order. A sample
Multi-Site SAN configuration is shown in Figure 7 (page 11). In this configuration, the cluster has
three sites: Site A, Site B, and Site C. Site A is primary.
Connecting application servers with single or multiple NICs to a Multi-Site SAN
1. On each application server, enter the cluster VIPs in the same order as on the Discovery tab
of the iSCSI Initiator Properties window.
10 Designing a Multi-Site SAN