9.5 HP P4000 Multi-Site HA/DR Solution User Guide (AX696-96074, September 2011)

Figure 14 Target portal value remains Default
8. After setting the values, click OK to close the Advanced Settings dialog.
9. Click OK again to finish logging on.
10. If you want to set the MPIO load balancing policy, see the HP P4000 DSM for MPIO
Deployment Guide.
11. If you have multiple NICs, repeat steps 1 through 10 for the additional NICs.
Using MPIO with multiple subnets
When you are using multiple subnets in a Multi-Site SAN, the HP P4000 DSM for MPIO or Microsoft
DSM will only build I/O paths to the storage systems that are in the same subnet as the application
server. See the DSM for MPIO Deployment Guide for more information about MPIO.
When using VMware ESX 4 or higher and its native MPIO in a Multi-Site SAN, you cannot configure
more than one subnet and VIP. Multiple paths cannot be routed across subnets by the ESX/ESXi
4 initiator. With VMware ESX, the preferred configuration is a single subnet and with ESX servers
assigned to sites in SAN/iQ.
Setting up application clusters in a Multi-Site SAN environment
Just as you can set up a Multi-Site SAN for data availability even when a complete site is offline,
you can set up application clusters (Microsoft Cluster Server, VMware ESX Cluster, Linux Cluster,
and so forth) so that the cluster nodes are split between the sites. By having the automated
failover/failback capabilities in the SAN, many application cluster technologies can leverage this
capability to do “stretch” application clustering. Consult the application server specific information
for information about setting up clustering to support this type of failover. In general, you must
perform three tasks:
1. Set up an application server node in each site.
2. Configure the application server to connect to the volumes on the SAN.
3. If using multiple subnets in the storage cluster, log on to both VIPs in the cluster.
If you are using the HP P4000 DSM for MPIO, see the DSM for MPIO Deployment Guide.
Setting up application clusters in a Multi-Site SAN environment 17