Is Server Virtualization The New Clustering?

Powerful Solutions For Non-Transaction Based Apps

For non-transaction based apps, look at the increasingly sophisticated  third-party monitoring solutions available. See the table below. For example, Lyonesse Software's Double-Take, Steeleye's LifeKeeper, Symantec's Veritas Application Director, and Cassatt's Active Response can monitor both physical and virtual applications running on virtual servers, and notify IT staff when a host or application fails, so that a new virtual instance can be quickly brought online.

Lyonesse's Double-Take can monitor the running state of two servers to enable failovers.

Vendors and Products

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Cassatt.comActive ResponseMonitor, pool, and allocate physical and VM resources
Citrix.comVMlogix Automated provisioning
Lyonesse Software ( Real-time data replication and failover
Microsoft.comWindows Server 2008 Hyper-VVirtualization for 64-bit servers
Novell.comCloud ManagerAutomated, template-based provisioning
ForgeHardware appliance for one-click failovers
Steeleye.comLifeKeeperData protection, disaster recovery and high availability for Windows, Linux, and VMware
Symantec.comVolume ReplicatorVolume replication over IP networks
Veritas Application DirectorMonitor physical and VM workloads
Virsto.comVirsto OneVirtual storage management
VMware.comvCloud DirectorLightweight app server and load balancing
vFabrikVirtual datacenter creation
VM6Software.comVMexHigh-available clustering for Hyper-V

Virtualization and clustering are becoming more interrelated and complementary solutions for IT managers. While the two technologies grew out of different needs and have had different infrastructures, they are now merging and providing a powerful tool for managing more complex workloads in the data center. This is making both more appealing to smaller-sized businesses. "If you can afford the longer failover times for some of your applications, you can get a better level of resiliency and business continuity from virtualization," says Oestreich.

David Strom
Strom is the former editor-in-chief at Tom's Hardware and the founding editor-in-chief of Network Computing magazine. He has written thousands of articles for dozens of technical publications and websites, and written two books on computer networking.