Configuring HP-UX For Peripherals

222 Chapter9

Conﬁguring Uninterruptable Power Systems

Planning to Conﬁgure a UPS

Hardware Considerations

Choose your UPS based on its rated load capabilities.

Determine which pieces of hardware besides the server require coverage

by a UPS. For example,

• If users in another building rely on the server, or several servers in a

building require LAN trafﬁc to shut down cleanly, you might need to

ensure that the LAN interface is protected by the UPS.

• If you need to call in to the UPS-based servers, the dial back and DTC

to which it is attached may need to be on the UPS.

Calculate the voltage/amperage (VA) capacity to ensure that your UPS

unit is properly rated for the expected load. Detailed instructions for

calculating how many systems and/or devices can be powered by an HP

PowerTrust UPS are found in the HP Conﬁguration Guide.

When adding disks or other peripherals to any computer covered by a

UPS, recalculate the voltage/amperage (VA) load to ensure that the new

current draw remains within the UPS coverage.

Prepare the site before installing the UPS, following the

recommendations provided in the UPS hardware installation manual

and PowerTrust System Guide (HP partnumber 5961-8383) for your UPS

model.

Figure 9-1, “Sample Conﬁguration of an Uninterruptable Power System

(UPS),” illustrates a sample UPS conﬁguration. (Note, the RS-232-C

cabling from the console to SPU is not shown.) All protected components

derive their electrical power through the UPS, which is plugged into the

power source.

Figure 9-1 Sample Conﬁguration of an Uninterruptable Power System