About application availability options


About application availability options
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Veritas products can provide the ultimate levels of availability in your KVM environment. In a KVM environment, you can choose a different combination of High Availability solutions: ApplicationHA and Cluster Server (VCS).

ApplicationHA by itself provides application monitoring and restart capabilities while providing ultimate visibility and manageability through Veritas Operations Manager. When ApplicationHA is adopted together with Cluster Server in the host, the two solutions work together to ensure that the applications are monitored and restarted if needed, and virtual machines are restarted if application restarts are not effective. These two solutions work together to provide the ultimate level of availability in your KVM environment.

If your KVM environment requires the same level of application availability provided by a VCS cluster in a physical environment, you can choose to adopt Cluster Server in the virtual machines. In this configuration, your application enjoys fast failover capability in a VCS cluster in the virtual machines.

Table: Comparison of availability options

Required availability level	Recommended solution	Supported virtualization option
Application monitoring and restart	ApplicationHA in the virtual machines	Red Hat Enterprise Linux (RHEL) KVM
Virtual machine monitoring and restart	VCS cluster in the host monitoring the virtual machines as a resource	Red Hat Enterprise Linux (RHEL) KVM Red Hat Enterprise Virtualization (RHEV) SUSE Linux Enterprise Server (SLES) KVM
Combined application and virtual machine availability	ApplicationHA in the virtual machine and VCS cluster in the host	Red Hat Enterprise Linux (RHEL) KVM
Application failover to standby node in cluster	VCS cluster in the virtual machines	Red Hat Enterprise Linux (RHEL) KVM SUSE Linux Enterprise Server (SLES) KVM Red Hat Enterprise Virtualization (RHEV) Microsoft Hyper-V Oracle Virtual Machine (OVM)

Note:

For application high availability and failover capabilities the application data must be on the shared storage accessible to all the nodes of the VCS cluster.

For setup information for ApplicationHA or VCS:

See Installing and configuring Cluster Server in a kernel-based virtual machine (KVM) environment.

Note:

You can also use the cluster functionality of Storage Foundation HA or Storage Foundation Cluster File System HA if you need storage management capabilities in addition to application availability for your KVM environment.