AC Power Monitoring
IMPORTANT:
You must change the ride-through time for a Hewlett Packard
Enterprise-supported UPS from the manufacturing default setting to an appropriate value for
your system. During installation of an NS2100 system or HPE UPS, your service provider can
refer to the "Setting the Ride-Through Time and Configuring for Maximized Runtime" procedure
in the
NonStop NS2100 Hardware Installation Manual
for these instructions.
NS2100 systems require one of the following to support system operation through power transients
or an orderly shutdown of I/O operations and processors during a power failure:
•
The optional, Hewlett Packard Enterprise-supported single-phase UPS (with one to two
ERMs for additional battery runtime) or the Hewlett Packard Enterprise-supported model
R12000/3 three-phase UPS (with one to four ERMs for additional battery runtime)
•
A user-supplied UPS installed in each modular cabinet
•
A user-supplied site UPS
If the HPE R5000 or HPE R12000/3 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
.
When properly configured, OSM power-failure support for NS2100 systems includes:
•
Detection and notification of power failure situations
•
Monitoring the outage against a configurable ride-through time in order to avoid disruption
if the power failure is short in duration
•
If the ride-through time expires before the power returns, initiating a controlled shutdown of
I/O operations and processors. (This shutdown does not include stopping or powering off
the system, nor does it stop TMF or other applications. Customers are encouraged to execute
scripts to shut down database activity before the processors are shut down.)
You must perform these actions in the OSM Service Connection:
•
Perform the
Configure a Power Source as UPS
action to configure the power rail (either
A or B) connected to the UPS.
•
Perform the
Configure a Power Source as AC
action, to configure the power rail (either B
or A) connected to AC power.
•
Perform the
Verify Power Fail Configuration
, located under the System object, to verify
that power failure support has been properly configured and is in place for the system.
NOTE:
For NS2100 systems, these actions are located under the Power Supply units located
in the VIO modules.
How OSM Power Failure Support Works
NOTE:
OSM power failure support works as described only after it has been properly configured.
When OSM detects that one power rail is running on UPS and the other power rail has lost power,
it logs an event indicating the beginning of the configured ride-through time period. OSM monitors
whether AC power returns before the ride-through period ends, and:
•
If AC power is restored before the ride-through period ends, the ride-through countdown
terminates and OSM does not take further steps to prepare for an outage.
•
If AC power is not restored before the ride-through period ends, OSM broadcasts a
PFAIL_SHOUT message to all processors (the processor running OSM being the last one
in the queue) to shut down the system's ServerNet routers and processors in a fashion
62
System Installation Specifications for NS2100 Systems
