On Jun 3, 2010 7:35 PM, David Magda wrote: > On Jun 3, 2010, at 13:36, Garrett D'Amore wrote: > > > Perhaps you have been unlucky. Certainly, there is > a window with N > > +1 redundancy where a single failure leaves the > system exposed in > > the face of a 2nd fault. This is a statistics > game... > > It doesn't even have to be a drive failure, but an > unrecoverable read > error.
Well said. Also include a controller burp, a bit flip somewhere, a drive going offline briefly, fibre cable momentary interruption, etc. The list goes on. My experience is that these weirdo "once in a lifetime" issues tend to present in clumps which are not as evenly distributred as statistics would lead you to believe. Rather, like my kids, they save up their fun into coordinated bursts. When these bursts happen, the ensuing conversations with stakeholders about how all of this "redundancy" you tricked them into purchasing has left them exposed. Not good times. -- This message posted from opensolaris.org _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
