Akhilesh Mritunjai wrote:
I believe that the word would have gone around already, Google engineers have published a paper on disk reliability. It might supplement the ZFS FMA integration and well - all the numerous debates on spares etc etc over here.
Good paper. They validate the old saying, "complex systems fail in complex ways." We've also done some internal (Sun) studies which cast doubt on the ability of SMART to predict failures.
To quote /. "The Google engineers just published a paper on Failure Trends in a Large Disk Drive Population. Based on a study of 100,000 disk drives over 5 years they find some interesting stuff. To quote from the abstract: 'Our analysis identifies several parameters from the drive's self monitoring facility (SMART) that correlate highly with failures. Despite this high correlation, we conclude that models based on SMART parameters alone are unlikely to be useful for predicting individual drive failures. Surprisingly, we found that temperature and activity levels were much less correlated with drive failures than previously reported.'" Link to the paper is http://labs.google.com/papers/disk_failures.pdf
As for the spares debate, that is easy: use spares :-) -- richard _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
