Seagate ST9900805SS Savvio 10K.1 SAS Product Manual - Page 37
ST936701SS in 3 Gbit operation, ST936701SS in 1.5 Gbit operation
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ST936701SS in 3 Gbit operation Typical power dissipation under idle conditions in 3Gb operation is 7.49 watts (25.56 BTUs per hour). 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 your 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. Amperes ST936701SS DC CURRENT/POWER vs THROUGHPUT (3Gbit) Random 8 Block Re ads 1.800 18.00 1.600 16.00 1.400 14.00 1.200 12.00 1.000 10.00 0.800 8.00 0.600 6.00 0.400 4.00 0.200 2.00 0.000 0.0 0.00 50.0 100.0 150.0 200.0 250.0 300.0 I/Os per Second Power (watts) 5Vo lt A 12 Vo lt A Watts Figure 8. ST936701SS (3 Gbit) DC current and power vs. input/output operations per second ST936701SS in 1.5 Gbit operation Typical power dissipation under idle conditions in 1.5 Gbit operation is 7.44 watts (25.39 BTUs per hour). 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 your 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. ST936701SS DC CURRENT/POWER vs THROUGHPUT (1.5Gbit) Random 8 Block Reads 1.800 18.00 1.600 16.00 1.400 14.00 5Volt A 12 Vo lt A Watts 1.200 12.00 Amperes Power (watts) 1.000 10.00 0.800 8.00 0.600 6.00 0.400 4.00 0.200 2.00 0.000 0.0 0.00 50.0 100.0 150.0 200.0 250.0 300.0 I/Os per Second Figure 9. ST936701SS (1.5 Gbit) DC current and power vs. input/output operations per second Savvio SAS Product Manual, Rev. D 31