When the utility power fails, OSM does not detect that the data center UPS is running on battery
and the UPS has entered its battery runtime. OSM does not initiate the controlled shutdown of
the I/O operations and processors.
•
If the utility power is not restored before the data center UPS shuts down, any data in the
NonStop system disk drive write cache that has not been transferred to the disk drive media
is lost.
To prevent data loss during a utility power failure, you must manually disable the Write Cache
Enable (WCE) option on all the disk drive volumes. For information on how to disable the WCE,
see the
SCF Reference Manual for the Storage Subsystem (G06.28+, H06.05+, J06.03+)
.
•
When the utility power is restored, you can enable the WCE.
•
During a utility power failure, the system can continue to run until the data center UPS runs
out of power or until it shuts down.
118
UPS and Data Center Power Configurations
