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DRS - Distributed Resources Service

    1. No Reboot is required.

    2. This process will recommend moving a VM for performance reasons.  This can be set to automatically  move the VM. 

HA - High Availability

    1. Reboot is required

    2. If a host crashes, this service will start the VM's that were on it, to another host automatically.  The VM's will have powered down unexpectedly though. 

FT - Fault Tolerance

    This feature is introduced in ESX4 and keeps a running copy on another host.  If the primary host fails, the other takes over with no down time.  This is currently limited to VM's with one vCPU though.
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