FECO LVC # 7

	FECO:	LVC # 7
	MODIFICATION NO:	N/A
	PRODUCT:	UPS SOFTWARE
	SUB-ASSEMBLY:	N/A
	ESTIMATED MAN HOURS:	N/A
	CLASS OF CHANGE:	INFORMATIONAL
	REASON FOR CHANGE:	DETAILING UPS SOFTWARE UTILISATION
	RELATED FECO/AB	N/A

1. INTRODUCTION
   Usually sites which have a UPS (Uninterruptable Power Supply) also have software installed to control the UPS function.
   
   
2. There are two main types of software, Orderly Shutdown and Power Fail Recovery (PFR).
   
   
3. ORDERLY SHUTDOWN FUNCTION
   In the event of an input mains failure, this runs the system down in an orderly sequence,
   and then switches the system off.
   When the power returns the system runs up, with all screens back to the log in prompt.
   
   
4. POWER FAIL RECOVERY FUNCTION
   In the event of an input mains failure, this flushes to disk, all the users application
   information; and then runs the system down in the correct sequence and then switches the
   system off.
   When the power returns the system runs up, and then uploads the users application details.
   Each user screen then appears as it was before the mains failure and allows the user to
   continue on working, seamlessly.
   
   
5. At present the UPS software usually used is:
   

   Orderly Shutdown	Lansafe III	Rel 4.0.
   Power Fail Recovery	PowerMon II	MP-RAS

    

6. CABLES
   You are to ensure that the correct type of cable (UPS to system) is used for the appropriate UPS and UPS software being used.
   
7. On new systems the only I/O system to support full Power Fail Recovery is RIO.
   
   Older RTC systems also support full Power Fail Recovery.
   
   Other I/O systems do not fully support Power Fail Recovery, so will not allow all of
   the users to continue working seemlessly, after a mains power failure. In these
   cases there is little point in using PFR software, when Orderly Shutdown software
   will function the same.
   
8. SUMMARY
   Usually Power Fail Recovery is only used for RTC, RIO and Non Networked
   systems.

   Usually Orderly Shutdown is used for all other systems including all Networked
   (non RTC / RIO) and non Unix SVR4 systems.

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