APC AP9606 Specifications download pdf (Page 37)

Chapter 3. UPS configurations for cluster 29

4. Some commands in UPS.CMD were launched asynchronously. To allow such

operations to complete, we added a delay as a SHUTGUI.EXE parameter. The

value of 120 seconds is an example.

5. After this SHUTGUI.EXE delay, the operating system begins to shut down.

6. From our experience, a Windows NT 4.0 shutdown requires approximately

90 seconds. This depends on the number of remaining (non-clustered)

services and applications.

7. Figure 19 shows a reserve interval of 90 seconds. We used this to get some

flexibility in UPS capacity planning. If any of the time estimates above turned

out to be too low (for example, an operating system shutdown takes longer

than usual), then this reserved time may be used up.

8. The UPS powers off the power outlets and enters sleep mode (monitors input

for reestablishment of power).

9. Some time later, the power is restored.

10.During the UPS wakeup phase, a certain level of recharge must be reached,

and the UPS Wakeup Delay must be passed. Recharge level and delay can be

configured by the administrator.

11.The UPS powers on the power outlets.

12.The servers begin to boot (except when Windows 2000 power management

requires operator intervention). With our solution, application-related cluster

resources are offline.

The time between steps 1 and 8 is limited by the UPS Turn Off Delay. This delay

cannot be set to a value greater than 600 seconds. Thus the sum of all intervals

shown in Figure 19 from step 1 to step 8 must not exceed 600 seconds.

3.1.2 UPS capacity planning

A UPS should have the capacity to manage a complete shutdown, even if the

next power loss occurs shortly after reestablishing power. With a APC UPS, you

can configure to which level the UPS must be charged before going online.

Capacity calculation is based on the shutdown time. The UPS must be able to

provide the total power workload for all components during a complete shutdown.

To get the minimum value for UPS run time, increase the estimated shutdown

time by 10 percent. This takes into account that each battery loses capacity

during its life.

We developed solutions for providing power via one power line see 3.2, “Single

power line solutions” on page 31) or with exploiting power line redundancy (see

3.3, “Solutions with double power lines” on page 51). Depending on the solution

you choose, one or two UPS units are needed. In the case of two units, the

cluster’s power workload is distributed among them, so that each unit provides (in

the ideal case) half of the total workload.

The electrical requirements are:

• An IBM Netfinity 8500R (8681) needs an electrical input in kilovolt-amperes

(kVA) between approximately 0.5 kVA and 2.1 kVA from three power supplies.

(Reference: IBM Netfinity 8500R Hardware Maintenance Manual.)

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