Date: Fri, 12 Jan 2007 22:25:36 -0600 From: Eric Anderson <anderson@centtech.com> To: Jeremie Le Hen <jeremie@le-hen.org> Cc: freebsd-geom@freebsd.org Subject: Re: What is gstripe ? Message-ID: <45A85F40.7050703@centtech.com> In-Reply-To: <20070113004728.GQ2616@obiwan.tataz.chchile.org> References: <20070113004728.GQ2616@obiwan.tataz.chchile.org>
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On 01/12/07 18:47, Jeremie Le Hen wrote: > Hi list, > > Please forgive me, I know this is a dumb question. I've checked the > manpage, Wikipedia [1], Webopedia [2] and a few other documents, > but I'm still not sure to fully understand the striping concept. > > gmirror(8) provides RAID-1 and is very easy to understand. > gconcat(8) is easy to grasp as well. > > However, I'm experiencing some difficulties to understand gstripe(8). > I would say it's a kind of smart disk concatenation which stores > block X on disk (X % N), where N is the number of disk in the RAID-0. > This permits faster read/write. > > Am I right ? > > [1] http://en.wikipedia.org/wiki/Data_striping > [2] http://www.webopedia.com/TERM/R/RAID.html > > Thank you. > Best regards, Yea, that's pretty close! A stripe (RAID 0 - called that because it really isn't redundant in any way) is just like you described. Write one block to the first disk, then the next block to the next disk, etc. It distributes your read/write activity to increase performance. Sequential read/write performance may not be affected, but random IO should get a nice boost. See this site for some pretty graphics: http://www.raid.com/04_00.html or more specifically: http://www.raid.com/04_01_00.html Eric -- ------------------------------------------------------------------------ Eric Anderson Sr. Systems Administrator Centaur Technology An undefined problem has an infinite number of solutions. ------------------------------------------------------------------------
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