Seagate ST9146853SS Savvio 15K SAS Product Manual - Page 36
ST936751SS in 3 Gbit operation, ST936751SS in 1.5 Gbit operation
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ST936751SS in 3 Gbit operation Typical power dissipation under idle conditions in 3Gb operation is 5.62 watts (19.18 BTUs per hour). To obtain operating power for typical random read operations, refer to the following I/O rate curve (see Figure 3). 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. CURRENT/POWER vs THROUGHPUT (SAS - 3.0GB) Random 8 Block Reads 1.400 14.00 5Vo lt A 1.200 12.00 12 Vo lt A Watts 1.000 10.00 Amperes Power (watts) 0.800 8.00 0.600 6.00 0.400 4.00 0.200 2.00 0.000 0.0 0.00 50.0 100.0 150.0 200.0 250.0 300.0 350.0 400.0 450.0 I/Os per Second Figure 5. ST936751SS (3 Gbit) DC current and power vs. input/output operations per second ST936751SS in 1.5 Gbit operation Typical power dissipation under idle conditions in 1.5 Gbit operation is 5.77 watts (19.69 BTUs per hour). To obtain operating power for typical random read operations, refer to the following I/O rate curve (see Figure 3). 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. CURRENT/POWER vs THROUGHPUT (SAS - 1.5GB) Random 8 Block Reads 1.400 14.00 5Vo lt A 1.200 12.00 12 Vo lt A Wat t s 1.000 10.00 Amperes Power (watts) 0.800 8.00 0.600 6.00 0.400 4.00 0.200 2.00 0.000 0.0 0.00 50.0 100.0 150.0 200.0 250.0 300.0 350.0 400.0 450.0 I/Os pe r Se cond Figure 6. ST936751SS (1.5 Gbit) DC current and power vs. input/output operations per second 28 Savvio 15K SAS Product Manual, Rev. B