Monitor Power Supplies; Monitor Batteries; Maintain Batteries; Power Failure Recovery - HP NonStop NS-series Operation Manual

Power Failures: Preparation and Recovery

Monitor Power Supplies

Monitor power-generating equipment and run regular checks on any backup
generators to make sure that you can handle extended power outages.

Monitor Batteries

Monitoring site UPS batteries is the responsibility of the customer. OSM does not
interface with a site UPS or batteries.
Monitoring batteries in an internal UPS and ERM is performed using OSM.
Monitor batteries in I/O enclosures using OSM. For more information on battery
attributes and actions, see the OSM Service Connection online help.

Maintain Batteries

Make sure that all installed batteries and spare batteries are always fully charged.
Correct any problems that are causing the batteries to become drained.
In general, batteries are constantly charging when AC power is available to a system.
When recovering from a power failure event, it will take time for the batteries to be fully
charged. For different kinds of batteries:
Maintenance and charging of site UPS batteries is the responsibility of the
customer.
Information about maintenance and charging of batteries in an optional internal
UPS and ERM is located in documentation that comes with the products.
Information about maintenance and charging of batteries in I/O enclosures is
located in the
batteries for I/O enclosures require charging every six months.

Power Failure Recovery

After a power failure, if AC power is restored to a NonStop NS-series server while the
batteries are still holding up the system, it will not be necessary to restart the system.
Resume operations.
Depending on the configuration of UPS resources, power failure can last long enough
to leave the system with some processors down because the batteries were drained to
the point where the processors can no longer operate. In conjunction with an internal
UPS, a homogeneous power off can be configured to avoid this condition.
If the power failure lasts long enough to drain the batteries completely, the system
Power/Fail should stop the system. When power is restored, the operator must then
restart the system.
HP Integrity NonStop NS-Series Operations Guide —529869-005
Support and Service Library for NonStop S-series servers. Spare
14- 4
Monitor Power Supplies