On 23 Jan 2013 21:45, "Michel Talon" <ta...@lpthe.jussieu.fr> wrote: > > On Wed, 23 Jan 2013 14:26:43 -0600, Chris Rees <utis...@gmail.com> wrote: > > > > > So we have to take your word for it? > > Provide a link if you're going to make assertions, or they're no more > > than > > your own opinion. > > I've heard this same thing -- every vdev == 1 drive in performance. I've > never seen any proof/papers on it though. > > > first google answer from request "raids performance" > https://blogs.oracle.com/roch/entry/when_to_and_not_to > > Effectively, as a first approximation, an N-disk RAID-Z group will > behave as a single device in terms of delivered random input > IOPS. Thus a 10-disk group of devices each capable of 200-IOPS, will > globally act as a 200-IOPS capable RAID-Z group. This is the price to > pay to achieve proper data protection without the 2X block overhead > associated with mirroring.
Thanks for the link, but I could have done that; I am attempting to explain to Wojciech that his habit of making bold assertions and arrogantly refusing to back them up makes for frustrating reading. Chris _______________________________________________ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "freebsd-hackers-unsubscr...@freebsd.org"
