Date: Wed, 23 Jan 2013 22:22:48 +0100 From: Michel Talon <talon@lpthe.jussieu.fr> To: Mark Felder <feld@feld.me> Cc: freebsd-hackers@freebsd.org Subject: Re: ZFS regimen: scrub, scrub, scrub and scrub again. Message-ID: <101D6382-BF57-43EB-A5FA-A63D4062F5FD@lpthe.jussieu.fr>
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[-- Attachment #1 --] On Wed, 23 Jan 2013 14:26:43 -0600, Chris Rees <utisoft@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. -- Michel Talon talon@lpthe.jussieu.fr [-- Attachment #2 --] 0 *H 01 0 + 0 *H o000 *H 0,1 0 UFR1 0 U CNRS10 UCNRS20 090121090352Z 290120090352Z051 0 UFR1 0 U CNRS10UCNRS2-Standard0"0 *H 0 dj#þ*](?DkG57tMaLw[שeɬ<{"G_x yBearc@[g'>wM yoK RXB37wl X%ن\.p9*ؒi/ Re`̏\.L7<PAz<\ݰsz;3 M[8.3vrT-PhwiQ$8,lNc1Z 00U 00 U RGY<xfk [0TU #M0KP 3 F<k; 0.0,1 0 UFR1 0 U CNRS10 UCNRS2 0U 0>U 705031/-http://crls.services.cnrs.fr/CNRS2/getder.crl0 *H OL'jPUL,v>Y/ hC ,kge+1ς"l|L{L) >{$L2zڬ`uf~ #DŽ]HN,ԍ/6)og mZ џ˯U ʱ[\tFcG~,ο0 Fl?0~n 9IϓiȞgsJ|B(ݥUd?Ta& `@ /!8 wg00P;0 *H 051 0 UFR1 0 U CNRS10UCNRS2-Standard0 120424111602Z 140424111602Z0l1 0 UFR1 0 U CNRS10U UMR758910U Michel Talon1%0# *H talon@lpthe.jussieu.fr0"0 *H 0 oսD%ѢV*&7o66X79c_ Tj<Bǥ\0,Q>2Mmb}ɗhBSn,U $&A4}O.(03VFvU4c#Qt駁 VD3#vܼR J_rO@Ő8ː3+ڠ2l{I6T@X#9_5ՍMcAFlrT } 00 U 0 0 `HB0U 0z `HB mkCertificat CNRS2-Standard. Pour toute information se reporter http://igc.services.cnrs.fr/CNRS2-Standard/0 U `-Sy~ 0TU #M0KRGY<xfk [0.0,1 0 UFR1 0 U CNRS10 UCNRS20!U 0talon@lpthe.jussieu.fr0GU @0>0<:86http://crls.services.cnrs.fr/CNRS2-Standard/getder.crl0 *H Y5]H_bF/Q <*{Iq"T辸fw(όbdHʡ).vH_FFkZ9_pLRAc߬9tMQ &Jᖪk~3n(}#t2'}ͫS}2BJ!B=OwlT"Xsi Y5a`NIo'PEˮyGhe1\0X0;051 0 UFR1 0 U CNRS10UCNRS2-StandardP;0 + 0 *H 1 *H 0 *H 1 130123212249Z0# *H 1&+O>8fm0J +71=0;051 0 UFR1 0 U CNRS10UCNRS2-StandardP;0L *H 1=;051 0 UFR1 0 U CNRS10UCNRS2-StandardP;0 *H SN4(,'[[%C fYZ{,Mժ˄5 R3T$eV\/Ϩ]qҠs%%99RT}k(<XP@-rғk840h<f@Awp'37b7ַ|c ,7Y8ΙMtw )Qa͟c t8W2H.VDh7d<t,*]2nIzyΣ.OC#{=Uί
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