NonStop NS14000 Series Planning Guide (H06.13+)

AC Power Monitoring
For Integrity NonStop NS14000 series servers, you can use one of the following to provide
continued system operation through a power failure. However, to take advantage of “OSM Power
Fail Support” (page 98), you must use the HP R5000 UPS or HP R5500 XR UPS. When used, it is
connected to the system’s dedicated service LAN via the maintenance switch through which OSM
monitors the power state.
• Optional HP R5000 UPS or HP R5500 XR UPS (with one or two ERMs for additional battery
power)
• User-supplied UPS installed in each modular cabinet
• User-supplied site UPS
If a user-supplied UPS is used instead of the HP-supported UPS models mentioned above, there is
no OSM notification or support when a power outage occurs, so the ride-through time that can be
configured through SCF does not apply either. Operators are responsible for detecting power
transients and outages and developing the appropriate actions, based on the estimated capacity
of the site UPS and the power demands made on that UPS.
The R5000 UPS or R5500 XR UPS and ERMs installed in modular cabinets do not support any
devices that are external to the cabinets. External devices can include tape drives, external disk
drives, LAN routers, and SWAN concentrators. Any external peripheral devices that do not have
UPS support will fail immediately at the onset of a power failure. Plan for UPS support of any
external peripheral devices that must remain operational as system resources. This support can
come from a site UPS or individual units as necessary.
OSM Power Fail Support
When properly configured, OSM provides important power fail support for Integrity NonStop
NS14000 series servers. OSM detects power outages and helps you take appropriate actions in
the event that the outage lasts longer than the estimated capabilities of your UPS.
When OSM detects that one power rail is running on UPS and the other power rail has lost power,
it logs an event and begins counting down the ride-through time configured for the system. The
ride-through time, designed to avoid disruption if the power outage is short enough in duration for
a UPS to provide the needed power, is specified through the POWERFAIL_DELAY_TIME attribute
of the SCF command ALTER SUBSYS (for more information, see “Considerations for Ride-Through
Time Configuration” (page 99)).
98 Operations and Management Using OSM Applications