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

Chapter 15: Configure Virtual Hosts 178
Cluster Health and Virtual Host Failover
To ensure the availability of a virtual host, HP Clustered File System
monitors the health of the administrative network, the active network
interface, and the underlying server. If you have created service or device
monitors, those monitors periodically check the health of the specified
services or devices. If any of these checks fail, HP Clustered File System
can transfer the virtual host to a backup interface on another server and
the network traffic will continue.
The following example shows the virtual host failover mechanism.
Servers A and B provide the http service, which is accessed with the
virtual host www.xvz.com. Each server is configured with an http service
monitor and a
GATEWAY device monitor to ping the router.
GAT EW AY
2000
IVITRONV
Server A
Router
Requests to virtual host
www.xvz.com
Primary interface
for virtual host
Backup interface
for virtual host
If a health check
fails, ClusterPulse
fails over virtual
host www.xvz.com
to the backup interface
on Server B, where
all services are up
Adminstrative Network
Switch
ClusterPulse monitors both
Server A and Server B
PanPulse checks primary
interface and administrative
network
http service monitor checks
http service
GATEWAY device monitor
pings router
Health checks Failover
Server B