HP StorageWorks Clustered File System 3.6.0 Windows Storage Server Edition Administration Guide (403103-005, January 2008)

Chapter 5: Configure Servers 53
HP Clustered File System provides failover protection for this
configuration. Without HP Clustered File System, requests are simply
alternated between the servers. If a server goes down, requests to that
server do not connect.
To configure for round-robin load balancing with HP Clustered File
System, you define virtual hosts as addresses in the A records on the
DNS. Then use HP Clustered File System to associate primary and
backup servers with that virtual host. In essence, you use the virtual host
capability of HP Clustered File System to accept the round-robin requests
sent by the DNS. HP Clustered File System handles the failover function
to the real servers in the cluster.
Following is a simple example to demonstrate this capability. (The
example may not be applicable to your specific usage environment.) In
the example, two servers, acmd1 and acmd2, are configured to accept
round-robin requests.
The addresses on the name server are virtual_acmd1 and virtual_acmd2.
Two virtual hosts have also been created with those names. The first
virtual host uses acmd1 as the primary server and acmd2 as the backup.
The second virtual host uses acmd2 as the primary and acmd1 as the
backup.
Virtual host traffic
acmd1
Primary:
virtual_acmd1
Backup:
virtual_acmd2
acmd2
Primary:
virtual_acmd2
Backup:
virtual_amcd1