[Beowulf] Re: failure trends in a large disk drive population

Richard Walsh rbw at ahpcrc.org
Tue Feb 20 10:39:36 EST 2007


David Mathog wrote:
> throwing scan errors is on the way out.  Quite surprising about the
> lack of a temperature correlation though.  At the very least I would
> have expected increased temps to lead to faster loss of bearing
> lubricant.  That tends to manifest as a disk that spun for 3 years
>   
    Not sure the vapor pressure of the perfluoroethers that they use as 
lubricants
    varies that much over the operating temperature regime of a disk 
drive.  If one
    can assume it is insignificant, then age alone would be the major 
contributing
    factor here (that is "hot" drives would not lubricant-age any faster 
that merely
    wam drives).

    rbw
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>   


-- 

Richard B. Walsh

"The world is given to me only once, not one existing and one
 perceived. The subject and object are but one."

Erwin Schroedinger

Project Manager
Network Computing Services, Inc.
Army High Performance Computing Research Center (AHPCRC)
rbw at ahpcrc.org  |  612.337.3467

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