User Manual

Constellation ES.3 SAS Product Manual, Rev. F 36
2TB models in 3Gb operation
Please refer to Table 4 for power dissipation numbers.
To obtain operating power for typical random read operations, refer to the following I/O rate curve (see Figure 5). Locate the typical I/
O rate for a drive in the system on the horizontal axis and read the corresponding +5 volt current, +12 volt current, and total watts on
the vertical axis. To calculate BTUs per hour, multiply watts by 3.4123.
Figure 9. 2TB models (3Gb) DC current and power vs. input/output operations per second
2TB models in 6Gb operation
Please refer to Table 4 for power dissipation numbers.
To obtain operating power for typical random read operations, refer to the following I/O rate curve (see Figure 6.). Locate the typical
I/O rate for a drive in the system on the horizontal axis and read the corresponding +5 volt current, +12 volt current, and total watts
on the vertical axis. To calculate BTUs per hour, multiply watts by 3.4123.
Figure 10. 2TB models (6Gb) DC current and power vs. input/output operations per second