Stratus ftServer 2900 Series - Table 5-4. Example: Calculating A-Side PDU and Rack-Space Requirements

Example of PDU Usage Calculation
Rack Configuration Planning 5-5
In the calculations in Table 5-4, components were added one by one, calculating:
 The total current demanded by the components
 The total space used in the rack
 The total number of outlets required
In this example, two PDUs can provide enough current for two ftServer 2900 systems,
one tape drive (typical), and one ftScalable Storage G3 system. This set of
components consumes 12.48 amperes; adding another CPU-I/O enclosure would
increase the consumption to 17.28 amperes, which exceeds the 15 amperes limit for
the PDUs. The configuration also utilizes four outlets in the A-side PDU and 14U of rack
space.
To add any more components, you require another pair of PDUs.
For information about planning a rack configuration, see:
 “Using PDUs” on page 5-1
 “Determining PDU Requirements” on page 5-2
 “Example of PDU Usage Calculation” on page 5-4
Table 5-4. Example: Calculating A-Side PDU and Rack-Space Requirements
1. Component
2. Cumulative
Space Used (U)
3. Cumulative
Number of
A-Side Outlets
4. Cumulative
Current (A)
PDU pair 2 0 0.00
Single CPU-I/O enclosure of ftServer
2900 system
614.8
†
† For a single CPU-I/O enclosure.
Tape drive (typical) 8 2 5.28
ftScalable Storage G3 system 10 3 7.68
ftServer system 14 4 12.48
PDU pair 2 0 0
Single CPU-I/O enclosure of ftServer
2900 system
614.8
†
Single CPU-I/O enclosure of ftServer
2900 system
10 2 9.6