Date: Wed, 27 Oct 2010 13:24:54 +0200 From: Ivan Voras <ivoras@freebsd.org> To: freebsd-performance@freebsd.org Subject: Re: Possible evidence of performance regression for 8.1-S (vs. 7.1) Message-ID: <ia9263$kkd$1@dough.gmane.org> In-Reply-To: <20101027111904.GF9443@albert.catwhisker.org> References: <20101026121352.GC2262@albert.catwhisker.org> <AANLkTi=Q9EwPJ%2BC4n3UFF9uFtNsukntkmqSjrXsHE3cm@mail.gmail.com> <20101020174854.GZ21226@albert.catwhisker.org> <20101021215330.GA86224@dan.emsphone.com> <20101021224237.GG52404@albert.catwhisker.org> <4CC6C396.1010905@freebsd.org> <20101026174501.GH2262@albert.catwhisker.org> <ia8srt$th0$1@dough.gmane.org> <20101027105506.GD9443@albert.catwhisker.org> <ia9137$gag$1@dough.gmane.org> <20101027111904.GF9443@albert.catwhisker.org>
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On 10/27/10 13:19, David Wolfskill wrote: >> note 2x drop in performance between outer and inner tracks. > > OK, but I'm not sure how that's likely to work for a multi-spindle RAID > 0 group.... Unless the RAID controller is trying to be overly smart (i.e. plays with fire) by somehow alternating stripe positions on drives, exactly the same as with single drives - stripe 0 on drive one will be logically joined with stripe 0 on the other drive, etc.
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