Date: Fri, 4 Jun 2010 15:31:58 -0500 From: Adam Vande More <amvandemore@gmail.com> To: Peter Clark <clarkp@mtmary.edu> Cc: freebsd-questions@freebsd.org Subject: Re: Some GMirror questions. Message-ID: <AANLkTilFim5MIH6fwB2IsFAfaKpfpGQbZShPZRB53eiY@mail.gmail.com> In-Reply-To: <4C093A5B.4040705@mtmary.edu> References: <4C093A5B.4040705@mtmary.edu>
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I think you are making this harder than is needs to be. When in doubt defe= r to the Handbook and the man pages. This also a good page http://onlamp.com/pub/a/bsd/2005/11/10/FreeBSD_Basics.html Lastly, I know at one point the 'load' algorithm had some performance > problems and people were saying to only use 'round-robin'. It seems as > though some code was committed back in Dec 2009 to fix it's this. Is ther= e a > practical rule of thumb to using 'load' vs 'round-robin'? Use load. http://www.freebsd.org/cgi/query-pr.cgi?pr=3D113885 > Is this an accurate way to look at it? > "Round-robin because if you have two disks in a mirror, they=92re both un= der > the same 'load' constraints, and it is best to KISS." > No. round-robin is a simple algorithm which alternates drive requests. Als= o two identical HD's may be mirrored but they will not really ever be same state in terms of caching, performance, etc. --=20 Adam Vande More
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