UPS Utility Manual

(b)
$null
To specify that no powerfail command file is to be used.
3.4.2.3 Powerfail Grace Period
The powerfail grace period configuration option allows you to specify a "grace period" (a
delay time) following the
detection of a UPS power failure by the UPS Monitor during which the UPS Monitor will
wait to see if AC power returns
to that UPS. If power is restored to the UPS before the grace period has elapsed,
then the UPS Monitor will NOT commence
execution of the user's "powerfail command file" (if a powerfail command file has been configured). But if power does
not
return to the UPS device by the time that the grace period has elapsed, then the UPS Monitor will commence
execution of
the "powerfail command file", if one is configured.
If no "powerfail command file" is configured via the UPS Monitor configuration file, then the setting of
the powerfail
grace period is immaterial. If a powerfail grace period is configured but no powerfail command file is configured,
then the setting of the powerfail
grace period has no effect upon the UPS Monitor's operation in response to a UPS device
power failure report.
parameter name
: powerfail_grace_period
parameter values:
(a)
nnnn
-- integer number of seconds in the grace period.
Minimum value: 0, Maximum value: 1800 seconds.
3.4.2.4 Powerfail Low Battery
The powerfail low battery configuration option allows you to specify one of two behaviors
of the UPS Monitor following its
detection of a "low battery charge" condition from any configured UPS device. The choices of behavior are:
(a)
System Abort
: UPS Monitor is to perform an intentional special system abort
at "low battery" detection, in order to
guarantee the correctness of data stored on disk devices in case AC power to one or more disk drives does fail exactly
at
a time when the disk device is performing a "write data" operation on the disk.
(Present models of SCSI disk devices can
not by
themselves guarantee not to write a partial sector of data if they happen to be writing data when their power
disappears.)
(b)
Keep Running
: UPS Monitor is commanded NOT to perform its intentional system abort at "low battery" detection time.
Rather, it is to allow the system to keep running even after the "low UPS battery" condition has been detected.
This
option gives the system approximately two more minutes of operation than it would have if
the "system abort" option were
specified, in the hope that this will be sufficient additional time to complete an orderly system shutdown before power to the
disk device(s) is actually lost.
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UPS Utility
7/18/2008
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