On Tue, 18 Jul 2006, Richard Elling wrote: > Daniel, > When we take into account time, the models we use are Markov models > which consider the amount of space used, disk size, block and whole > disk failures, RAID scheme, recovery from tape time, spares, etc. > All of these views of the system are being analyzed. Needless to say, > with the zillions of permutations of RAID schemes possible with a > system such as the Sun Fire X4500, we'll never model all of them. > Hence my request for the popular configs which I will model in detail.
This, for me, is a fascinating thread. What I'd like to see, please, is some detailed notes on the methodology employed, for those of us who have no idea what a Markov model is. That, and the thought process behind it, and some of terminology explained. For example, when one refers to an N-way RAID-Z pool, is that N disks + 1 for parity, or does N include the parity disk (or disks in the case of RAID-Z2)? -- Rich Teer, SCNA, SCSA, OpenSolaris CAB member President, Rite Online Inc. Voice: +1 (250) 979-1638 URL: http://www.rite-group.com/rich _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
