Symantec Encryption Management Server High Availability Options

Hi,

I would like to know what are the High Availability options that are present for Symantec Encryption Management Server (EMS)? We are using both Symantec Drive Encryption and File Share Encryption which are managed by Symantec Encryption Management Server (EMS).

Currently we only have one Symantec Encryption Management Server (EMS). Now the management is asking query about High Availability option for Encryption Management Server (EMS) should our primary server fails. Can anyone guide me in this regard?

Thanks.