Configuring HP-UX For Peripherals

228 Chapter9
Configuring Uninterruptable Power Systems
Configuring a PowerTrust UPS
• Decrease shutdown_timeout_mins if shutdown takes less than
five minutes. Small systems can take advantage of this.
CAUTION You must wait the full duration of shutdown_timeout_mins before
cycling power to the SPU, regardless of whether AC power has been
restored. Once activated, the UPS will turn off after that period of time.
If you are configuring more than one UPS, list their device special
files on separate lines in priority order. Make sure the most important
UPS (that is, for the SPUs) is the first one listed.
b. If a UPS governs peripheral devices and external bus extenders, it
should be configured to send and log messages, but not to initiate a
system shutdown. To use this option, set upstty for that UPS to
MSG_ONLY. (If you are using SAM, MSG_ONLY is referred to as
noncritical operation.)
c. Print a copy of your /etc/ups_conf file so that you can refer to it
when cabling the UPS hardware. You will want to verify that the
device special file associated with upstty matches that used by the
UPS. For example, upstty:/dev/tty0p1 specifies that the UPS is
plugged into the second port (p1) of an RS-232 MDP connected to an
interface card at card instance 0.
Step 5. Bring the system down to a halt (shutdown -h), then turn power off.
Install the UPS hardware, following instructions provided in the
hardware documentation. Also see the cabling information provided in
“Cabling Guidelines”, earlier in this chapter.
Step 6. Power up the peripherals, PowerTrust, then SPU. On rebooting, HP-UX
will configure all connected components. Everything connected to the
UPS will be protected against sudden power failure.