NonStop NS1000 Planning Guide (H06.07+)

Control, Configuration, and Maintenance Tools
HP Integrity NonStop NS1000 Planning Guide—542527-003
B-17
AC Power Monitoring
AC Power Monitoring
Integrity NonStop NS-series servers require either the optional HP model R5500 XR
UPS (with one or two ERMs for additional battery power) or a user-supplied UPS
installed in each modular cabinet, or a user-supplied site UPS to support system
operation through power transients or an orderly system shutdown during a power
failure.
If an HP R5500 XR UPS is installed, it is connected to the system’s dedicated service
LAN via the maintenance switch where OSM monitors the power state of either AC on
or AC off. If a power outage occurs, OSM starts a ride-through timer and outputs
EMS notification that the system is running on the UPS batteries. The ride-through
timer can be used to let the system continue operation for a short period in case the
power outage was only a momentary transient. One or two ERMs installed in each
cabinet can extend the battery-supported system runtime.
The system user must configure the system ride-through time to execute an orderly
shutdown before the UPS batteries are depleted. The time available for battery support
depends on the charge in the batteries and the power that the system draws.
Additionally, if the site’s air conditioning shuts down in a power failure, the system
should be shut down before its internal air temperatures can rise to the point that
initiates a thermal shutdown. A timely and orderly shutdown prevents an uncontrolled
and asymmetric shutdown of the system resources from depleted UPS batteries or
thermal shutdown.
If a user-supplied rackmounted UPS or a site UPS is employed rather than the HP
model R5500 XR UPS, the system is not notified of the power outage. The user is
responsible for detecting power transients and outages and developing the appropriate
actions, which might include a ride-through time based on the capacity of the site UPS
and the power demands made on that UPS.
The optional Model R5500 XR UPS and ERM installed in modular cabinets do not
support any devices that are external to the cabinets. External devices can include
Fibre Channel 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.
This information relates to handling power failures:
•
For ride-through time, see the SCF Reference Manual for the Kernel Subsystem.
•
For TACL SETTIME command, see the TACL Reference Manual.
•
For setting system time programmatically, see the Guardian Procedure Calls
Reference Manual.