Date: Thu, 17 May 2001 01:12:26 -0700 From: Marcus Reid <marcus@blazingdot.com> To: Greg Lehey <grog@lemis.com> Cc: Gabriel Ambuehl <gabriel_ambuehl@buz.ch>, Jonathan Fortin <jfortin@akalink.com>, questions@freebsd.org Subject: Re: Raid (BEST PERFORMANCE) Message-ID: <20010517011226.A4473@blazingdot.com> In-Reply-To: <20010517165026.V12294@wantadilla.lemis.com>; from grog@lemis.com on Thu, May 17, 2001 at 04:50:26PM %2B0930 References: <007501c0d718$61d4d920$020a10ac@node00> <721044900156.20010508182226@buz.ch> <20010516220747.A3755@blazingdot.com> <20010517165026.V12294@wantadilla.lemis.com>
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On Thu, May 17, 2001 at 04:50:26PM +0930, Greg Lehey wrote: > On Wednesday, 16 May 2001 at 22:07:48 -0700, Marcus Reid wrote: > > On Tue, May 08, 2001 at 06:22:26PM +0200, Gabriel Ambuehl wrote: > >> > >> Hello Jonathan, > >> Monday, May 07, 2001, 7:08:48 PM, you wrote: > >>> Best Performance Raid is a raid 0+1 setup. > >>> For example, you got 4 20gb harddrives. > >>> You create 2 strips of 2hds eachs, and you mirror them. > >>> It will have redundancy and the speed will be as fast as a normal > >> disk. It's > >>> basically a Raid-1 setup with 2 hard drives per strip instead of one > >> to > >>> counter write performance hits. > >> Some vendors like to call this RAID 10 (hmm. 1+0=10? only if those are > >> strings...). > > > > If I'm not mistaken, there's a difference between 0+1 and 10: one is > > striped and then mirrored, the other is mirrored and then striped. It's > > supposed to have some bearing on performance, 0+1 being the faster one. > > I've heard people make this kind of claim. I can't understand what > the difference is supposed to be. Can you justify it? It's something that I read on the qmail list; people were talking about the best RAID scheme to use for a very high-volume mail server. I don't have anything to offer from personal experience. I'm assembling a new mail machine very soon and have to select which level of RAID to use, so I'd be interested to hear if there's any truth behind it. Marcus To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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