A new method of power failure protection is available on the HP 3000
Series 991 and 995 computer systems and the Series 9X8 systems.
Instead of battery backup units, they will have one or more
HP model A2998A PowerTrust UPS (Uninterruptible Power Supply) devices.
Like the battery backup method of power failure, the UPS devices
protect the HP 3000 system against the loss of work in progress in
cases of utility AC power failures of up to fifteen minutes in
duration. Furthermore, they have been designed to appear similar to
the battery backup method which minimizes their effect on system operation
and management procedures.
UPS devices offer two principal advantages over the battery backup method:
In a minimal UPS-based system, the degree of power failure protection
is equivalent to that provided by the battery backup unit. You can, however,
add more UPS devices to the system and provide reserve power to selected
peripherals. Depending upon how much of the system is provided with UPS
power, it can run a partial or full workload non-stop through
limited periods of AC power failure.
The UPS contains a serial I/O communications interface that, in
conjunction with UPS Monitor/iX software, notifies the system operator
of any problems. Like the battery backup hardware that the UPS devices replace,
a system-wide power failure recovery message is broadcast
to all active user terminals and to the console upon the return of
power following a failure. In addition to console messages, the UPS Monitor/iX
software also posts a variety of status and warning messages to the
system log files which you can review and analyze to evaluate system
performance.
