SCF Reference Manual for the Kernel Subsystem

These changes take effect immediately.
4. Confirm the changed EMS template file names with another INFO command.
If you need to reverse this change, repeat the ALTER command with the original values.
Changing the Power-Failure-to-Shutdown Time Interval
This procedure lets you specify the power-failure-to-shutdown time interval.
For NonStop S-series servers, the power-failure-to-shutdown time interval is the maximum time the
system continues operation after the power has failed before entering a memory hold-up mode.
For Integrity NonStop NS-series servers and for Integrity NonStop BladeSystems, the
power-failure-to-shutdown time interval is the length of time the system continues before powering
off.
NonStop S-series servers recover automatically from a power failure if batteries are installed. The
batteries maintain power to the processor memory only for as long as they can, usually 45 minutes.
The actual amount of time the batteries can maintain memory depends on the system configuration,
power-fail delay time, and the charge state of the batteries. If power is restored before the batteries
are drained, the system begins processing at the point it was interrupted. However, if the power
failure lasts long enough to drain the batteries, the system is shut down. At this point, when power
is restored the system must be started by an operator.
On Integrity NonStop NS-series servers and Integrity NonStop BladeSystems, there is no automatic
recovery after the system is powered off, even when battery capacity remains in the Uninterruptible
Power Supply (UPS). Once AC power is restored, a manual restart of the system is necessary. If
the system is configured to use a UPS, the system can be configured for a ride-through time before
executing an orderly shut-down. For more information, see the POWERFAIL_DELAY_TIME attribute
of the ALTER SUBSYS command (POWERFAIL_DELAY_TIME { n | RIDETHRUONLY }).
For detailed information about power-failure-to-shutdown time, see the NonStop S-Series Planning
and Configuration Guide, the appropriate NonStop NS-series planning guide, or the NonStop
BladeSystem Planning Guide.
1. As a precaution, save the current configuration file with an SCF SAVE command (documented
in the SCF Reference Manual for G-Series RVUs or the SCF Reference Manual for J-Series and
H-Series RVUs). For example, use this command to save the current configuration file in a file
at the location $SYSTEM.ZSYSCONF.CONF0105:
-> SAVE CONFIGURATION 1.5
2. View the current power failure time interval (shown here in bold type) with an INFO command:
-> ASSUME SUBSYS $ZZKRN
-> INFO
NONSTOP KERNEL - Info SUBSYS \EAST.$ZZKRN
Current Settings
*DAYLIGHT_SAVING_TIME ................ USA66
*NONRESIDENT_TEMPLATES................ $SYSTEM.SYSTEM.NRTNEW
*POWERFAIL_DELAY_TIME................. 30
*RESIDENT_TEMPLATES................... $SYSTEM.SYSTEM.TNEW
SUPER_SUPER_IS_UNDENIABLE............ OFF
*SYSTEM_NAME.......................... \EAST
*SYSTEM_NUMBER........................ 254
SYSTEM_PROCESSOR_TYPE ............... NSR-W
*TIME_ZONE_OFFSET..................... -8:00
*TNSMISALIGN.......................... FAIL
*DESTINATION_CONTROL_TABLE............ SMALL
*TLE_LIMIT............................ 2000
*AUTO_RETRY_ON_ERROR_654.............. OFF
Changing the Power-Failure-to-Shutdown Time Interval 29