HPP Enterprises P4000 SAN - Manual (Page 41)

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Note
It is a best practice to physically separate the appropriate nodes or ensure
the order is valid before creating volumes.
Configuring multi-site high availability with multiple clusters
If multiple data centers are located at some distance from each other or the connections between them
are high-latency, low–bandwidth, you should not stretch a XenServer resource pool between these
sites. Since the resource pools would constantly need to transfer pool status and management
information across the network, a stretch pool would be impractical in this case. Instead, you should
create separate resource pools at each site, as shown in Figure 34.
Figure 34. Editing the cluster
In the implementation shown in Figure 34, the remote site would be utilized in the event of the
complete failure of the primary site (Site A). Resource pools at the remote site would be available to
service mission-critical VMs from the primary site, delivering a similar level of functionality
5 .
5 You can expect some data loss due to the asynchronous nature of data snapshots.