Fault Tolerant Operation

everRun software provides two user-defined availability levels for VMs: High Availability (HA) and Fault Tolerant (FT). In FT operation, an application continues to run without downtime during a fault. Use FT for applications that need the highest levels of availability.

You select a VM’s availability level when you create or import the VM by using the everRun Availability Console.

In FT operation, the everRun software transparently protects an application by creating a redundant environment for a VM running across two physical machines (PMs). With an identical instance of the selected VM on a second host, the everRun software provides FT-class protection of the VM.

When enabled, FT operation transparently protects a VM from all faults, with no downtime, and FT operation:

• Eliminates downtime due to any CPU, memory, I/O, or other physical machine (PM) failure.

• Handles failures without IT intervention.

• Ensures no data loss.

• Provides continuous, active validation of all components.

• Assures complete redundancy and recovery at all times.

Related Topics

The Virtual Machines Page

Using the everRun Availability Console