Cluster Server for the RHEV environment


Cluster Server for the RHEV environment
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Cluster Server (VCS) provides virtual machine monitoring and failover to another host in the Red Hat Enterprise Virtualization (RHEV) environment. VCS enables the following for RHEV hosts:

Connects multiple, independent systems into a management framework for increased availability.
Enables nodes to cooperate at the software level to form a cluster.
Links commodity hardware with intelligent software to provide application failover and control.
Enables other nodes to take predefined actions when a monitored application fails, for instance to take over and bring up applications elsewhere in the cluster.

VCS supports the following configurations:

Table: VCS supported configuration options in the RHEV environment

Objective	Recommended VCS configuration
Virtual machine monitoring and failover for hosts	VCS in the hosts
Disaster recovery in virtualized environment	VCS on the Red Hat Enterprise Linux (RHEL) hypervisor
Application failover for guest virtual machines	VCS in the guest virtual machines
Application failover across guest virtual machines and physical hosts	VCS in guest virtual machines and physical host machines

Note:

Virtual machine disaster recovery is supported in the RHEV environment only

Figure: Cluster Server in the RHEV host

Figure: Cluster Server in the RHEV guest

For more information on VCS features, see the Cluster Server Administrator's Guide.

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