HP 3000 99x Family, Installation Manual

Page: 117 / 173

Chapter 3 3-69
Installation
Rebooting and Reconfiguring
Configuring HP-UX for UPS on T-Class
On HP-UX 9.04 and later releases, PowerTrust UPS messages are displayed and logged.
Also, HP-UX must be configured to perform a graceful shutdown at a time interval after
AC power is lost.
(HP-UX 9.04 and later releases only)
In order for HP-UX to display UPS messages and log UPS events to the system
log, you must perform several configuration tasks:
1. For each UPS on the system, connect the supplied RS-232 cable from the UPS to a port
on a Modem Distribution Panel (MDP).
The supplied cable is 2 meters (6.5 feet) in length. If it won't reach, you can use a
straight-through 25-wire RS-232-C extender cable (30062C, 25 feet long) from the MDP
port to the DB-25 connector end of the cable supplied with the UPS, and then the UPS
cable to the UPS' DB-9 connector.
2. Once HP-UX is running, use SAM (Peripheral Devices) to configure the PowerTrust
UPS. You can specify:
a. The port(s) to be used for the UPS.
b. Whether to activate or deactivate the automatic shutdown feature entirely.
c. Whether the UPS is "critical." If a UPS is specified as "critical," it will be turned off
as part of an automatic shutdown. You should specify as "critical" all UPSs to which
HP-PB card cages or the SPU (the computer) are connected. No other UPSs should
be specified as "critical.".
d. The parameter shutdown_delay_mins (default = 1 minute). This parameter specifies
the number of minutes to wait before initiating shutdown -h following notification
that AC power to the UPS is lost. This interval allows the computer to continue
operation through brief electrical glitches.
NOTE Consider increasing the value of shutdown_delay_mins if the site
commonly experiences momentary power interruptions greater than
one (1) minute for which recovery of power is expected.
e. The parameter shutdown_timeout_mins. This parameter specifies the number of
minutes to monitor the shutdown -h operation before initiating reboot with the halt
option. In this way a reboot is executed even if the shutdown process hangs.
NOTE Consider increasing the value of shutdown_timeout_mins if
shutdown(1M) will take longer than 5 minutes (including the 60 second
delay by shutdown(1M) after notification of users).
Consider decreasing the value of shutdown_timeout_mins if
shutdown(1M) will take less than 5 minutes; small systems can take
advantage of this.
For detailed information, see the man pages on ups_mond(1M) and ups_conf(4).