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HA (High Availability) operates by having redundant servers which are then used to provide a service when system components fail. Normally, if a hosting server with a particular application crashes, the application will be unavailable until someone fixes the crashed server. HA clustering excludes this situation by detecting hardware/software faults, and immediately restarting the application on another server without requiring administrative intervention, a process known as failover. |
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To accomplish redundant failover Our Internet uses XenServer technology. Xen is a server virtualization platform that offers near bare-metal
virtualization performance for the virtualized server and client operating systems. XenServer uses the Xen hypervisor to virtualize each server on
which it is installed, enabling each to host multiple Virtual Machines simultaneously with guaranteed performance. Xen cloud platform allows you to
combine multiple Xen-enabled servers into a powerful Resource Pool and in doing so, XenServer extends the basic single-server notion of virtualization
to enable seamless virtualization of multiple servers as a Physical Server Failover Redundancy, Resource Pool, storage, memory, CPU and networking
resources can be dynamically controlled to deliver optimal performance, increased flexibility, availability, and maximum utilization of data center
resources. |
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