Seagate Savvio 10K.2, Product Manual

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Savvio 10K.2 SAS Product Manual, Rev. B 29
6.3 Power dissipation
ST9146802SS in 3 Gbit operation
Typical power dissipation under idle conditions in 3Gb operation is 5.18 watts (17.68 BTUs per hour).
To obtain operating power for typical random read operations, refer to the following I/O rate curve (see Figure
4). Locate the typical I/O rate for a drive in your system on the horizontal axis and read the corresp5
volt current, +12 volt current, and total watts on the vertical axis. To calculate BTUs per hour, multiply watts by
3.4123.
Figure 4. ST9146802SS (3 Gbit) DC current and power vs. input/output operations per second
ST973402SS in 3 Gbit operation
Typical power dissipation under idle conditions in 3Gb operation is 5.14 watts (17.54 BTUs per hour).
To obtain operating power for typical random read operations, refer to the following I/O rate curve (see Figure
4). Locate the typical I/O rate for a drive in your system on the horizontal axis and read the corresp5
volt current, +12 volt current, and total watts on the vertical axis. To calculate BTUs per hour, multiply watts by
3.4123.
Figure 5. ST973402SS (3 Gbit) DC current and power vs. input/output operations per second
ST9146802SS CURRENT/POWER vs THROUGHPUT (SAS - 3.0GB)
Random 8 Block Reads
0.000
0.200
0.400
0.600
0.800
1.000
1.200
1.400
0.0 50.0 100.0 150.0 200.0 250.0 300.0 350.0
I/Os per Second
Ampe
re
s
0.00
2.00
4.00
6.00
8.00
10.00
12.00
14.00
P
o
w
e
r (w
a
tts
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5Vo lt A
12 Vo lt A
Watts
ST973402SS CURRENT/POWER vs THROUGHPUT (SAS - 3.0GB)
Random 8 Block Reads
0.000
0.200
0.400
0.600
0.800
1.000
1.200
1.400
0.0 50.0 100.0 150.0 200.0 250.0 300.0 350.0
I/Os per Second
Amperes
0.00
2.00
4.00
6.00
8.00
10.00
12.00
14.00
Powe
r (wa
tts
)
5Vo lt A
12 Vo lt A
Watts