On Wed, 2008-05-28 at 10:34 -0600, Keith Bierman wrote: > On May 28, 2008, at 10:27 AM 5/28/, Richard Elling wrote: > > > Since the mechanics are the same, the difference is in the electronics > > > In my very distant past, I did QA work for an electronic component > manufacturer. Even parts which were "identical" were expected to > behave quite differently ... based on population statistics. That is, > the HighRel MilSpec parts were from batches with no failures (even > under very harsh conditions beyond the normal operating mode, and all > tests to destruction showed only the expected failure modes) and the > "hobbyist grade" components were those whose cohort *failed* all the > testing (and destructive testing could highlight abnormal failure > modes). > > I don't know that drive builders do the same thing, but I'd kinda > expect it.
Seagate's ES.2 has a higher MBTF than the equivalent consumer drive, so you're probably right. Western Digital's RE2 series (which my work uses) comes with a 5 year warranty, compared to 3 years for the consumer versions. The RE2 also have firmware with Time-Limited Error Recovery, which reports errors promptly, letting the higher-level RAID do data recovery. Both have improved vibration tolerance through firmware tweaks. And if you want 10krpm, I think WD's VelociRaptor counts. http://www.techreport.com/articles.x/13732 http://www.techreport.com/articles.x/13253 http://www.techreport.com/articles.x/14583 http://www.storagereview.com/ is promising some SSD benchmarks soon. James Andrewartha _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
