Virtualization removes the dependency of the workload on the hardware, resolving the hardware failure scenario, but exposes the next challenge in workload stability; Software /application level failures.
Although the Windows 2003 platform and later Linux OS versions are very stable, the application environments system state can be corrupted by a temporary failure, a virtual machine relocation, a OS patch, virtual disk maintenance or software upgrade. Snapshots can protect these Virtual workloads from software failures, but put user data in-between snapshots at risk. Many applications are fault tolerant enough to handle this, but not every scenario is protected.
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