Example: Calculating Required Number Of Drive Dc Power Supplies; Dc Power Supplies For Dem (240 Vac Pdu); Base Module Tape Drive Watts Consumption Example; Dem Tape Drive Watts Consumption Example - Oracle StorageTek SL3000 Manual

Table 1–5

DC Power Supplies for DEM (240 VAC PDU)

Total Watts Used Power Supplies
by All Drives Required for N+1
1 - 1,200 2
1,201 - 2,400 3
2,401 - 3,600 4
3,601 - 4,443 5

Example: Calculating Required Number of Drive DC Power Supplies

The example library has a Base module and a DEM with all three drive types (T10000,
T9840, LTO). Table 1–6 and
tape drives in the Base module and DEM:
Table 1–6

Base Module Tape Drive Watts Consumption Example

Drive Type Quantity of Drives
T10000D 6
T9840D 6
LTO7 4
The drives in the Base module use 1,546 W. In
maximum 843 W supported by a 120 VAC PDU. Therefore, the Base module requires a
240 VAC PDU to support the drive configuration — refer to
Table 1–7

DEM Tape Drive Watts Consumption Example

Drive Type Quantity of Drives
T10000C 4
T9840D 2
LTO5 4
The drives in the DEM use 756 W. In
VAC PDU can support 756 W. However, you cannot mix 120 VAC with 240 VAC PDUs
within the library. Therefore, the example library requires 240 VAC PDUs.
Two tape drive DC power supplies ship standard with the Base module and two
power supplies ship standard with the DEM. Therefore, subtract two from the DC
supplies required. Use Table 1–4
The tables below list the power supplies required for the example library.
Table 1–8

DC Supplies Required for Base Example

Configuration Option
N+1 (240 VAC PDU)
2N (240 VAC PDU)
2N+1 (240 VAC PDU)
Power Supplies
Required for 2N
2
4
6
8
Table 1–7 show how to calculate the total watts used by the
Multiply by Watts
Per Drive
127
100
46
Table
Multiply by Watts
Per Drive
93
100
46
Table 1–3 and
and Table 1–5 to determine what to order.
DC Supplies DC Supplies to Order
Required (= Required - 2)
3 1
4 2
6 4
Power Configurations
Power Supplies
Required for 2N+1
4
6
8
8
Total Watts Per
Drive Type
762
600
184
1–2, 1,546 W exceeds the
Table 1–4.
Total Watts Per
Drive Type
372
200
184
Table 1–5, either a 120 VAC or 240
Library Overview 1-13