Characterizing the response of a device in a computer system to vibration over a frequency range
Some embodiments of the present invention provide a system that characterizes a response of a device in a computer system to vibration over a frequency range. During operation, the device is vibrated at each frequency in a set of frequencies in the frequency range, wherein the device is vibrated at each frequency, one frequency at a time, until a stabilized response of the device is determined. The response of the device to vibration over the frequency range is then characterized based on information related to the stabilized response at each frequency in the set of frequencies.
1. A method for characterizing a response of a device in a computer system to vibration over a frequency range, the method comprising:
vibrating the device at each frequency in a set of frequencies in the frequency range, wherein the device is vibrated at each frequency, one frequency at a time, until a stabilized response of the device is determined; and
characterizing the response of the device to vibration over the frequency range based on information related to the stabilized response at each frequency in the set of frequencies.
2. The method of claim 1 , wherein:
determining the stabilized response of the device includes determining the stabilized response of the device based on the response of the device when the response of the device changes by less than a predetermined amount for a predetermined period of time.
3. The method of claim 1 , wherein:
determining the stabilized response of the device includes determining the stabilized response based on a relationship between the response of the device and a predetermined response profile.
4. The method of claim 1 , wherein:
characterizing the response of the device to vibration over the frequency range includes determining a time constant for the response of the device at frequencies in the set of frequencies.
5. The method of claim 1 , wherein:
characterizing the response includes characterizing the response for a dwell time at frequencies in the set of frequencies.
6. The method of claim 1 , wherein:
characterizing the response includes characterizing the response based a difference between a predetermined response and the stabilized response.
7. The method of claim 1 , wherein:
characterizing the response includes characterizing the response based on an elapsed time between when the device begins vibrating at a frequency in the set of frequencies and when the response stabilizes.
8. The method of claim 1 , wherein:
the device includes a disk drive; and
the response includes at least one of:
a read rate; and
a write rate.
9. A non-transitory computer-readable storage medium storing instructions that when executed by a computer cause the computer to perform a method for characterizing a response of a device in a computer system to vibration over a frequency range, the method comprising:
vibrating the device at each frequency in a set of frequencies in the frequency range, wherein the device is vibrated at each frequency, one frequency at a time, until a stabilized response of the device is determined; and
characterizing the response of the device to vibration over the frequency range based on information related to the stabilized response at each frequency in the set of frequencies.
10. The computer-readable storage medium of claim 9 , wherein:
determining the stabilized response of the device includes determining the stabilized response of the device based on the response of the device when the response of the device changes by less than a predetermined amount for a predetermined period of time.
11. The computer-readable storage medium of claim 9 , wherein:
determining the stabilized response of the device includes determining the stabilized response based on a relationship between the response of the device and a predetermined response profile.
12. The computer-readable storage medium of claim 9 , wherein:
characterizing the response of the device to vibration over the frequency range includes determining a time constant for the response of the device at frequencies in the set of frequencies.
13. The computer-readable storage medium of claim 9 , wherein:
characterizing the response includes characterizing the response for a dwell time at frequencies in the set of frequencies.
14. The computer-readable storage medium of claim 9 , wherein:
characterizing the response includes characterizing the response based a difference between a predetermined response and the stabilized response.
15. The computer-readable storage medium of claim 9 , wherein:
characterizing the response includes characterizing the response based on an elapsed time between when the device begins vibrating at a frequency in the set of frequencies and when the response stabilizes.
16. The computer-readable storage medium of claim 9 , wherein:
the device includes a disk drive; and
the response includes at least one of:
a read rate; and
a write rate.
17. An apparatus that characterizes a response of a device in a computer system to vibration over a frequency range, the apparatus comprising:
a vibrating mechanism configured to vibrate the device at each frequency in a set of frequencies in the frequency range, wherein the device is vibrated at each frequency, one frequency at a time, until a stabilized response of the device is determined; and
a characterizing mechanism configured to characterize the response of the device to vibration over the frequency range based on information related to the stabilized response at each frequency in the set of frequencies.
18. The apparatus of claim 17 , wherein:
the vibrating mechanism includes a mechanism configured to determine the stabilized response of the device based on changes in the response of the device over a predetermined period of time.
19. The apparatus of claim 17 , wherein:
the vibrating mechanism includes a mechanism configured to determine the stabilized response of the device based on a relationship between the response of the device and a predetermined response profile.
20. The apparatus of claim 17 , wherein:
the characterizing mechanism includes a mechanism configured to characterize the response based on a dwell time at frequencies in the set of frequencies.
21. The apparatus of claim 19 , wherein the stabilized response of the device includes at least one of a stabilized read rate for the device or a stabilized write rate for the device.