From owner-freebsd-questions Thu May 17 0:20:32 2001 Delivered-To: freebsd-questions@freebsd.org Received: from wantadilla.lemis.com (wantadilla.lemis.com [192.109.197.80]) by hub.freebsd.org (Postfix) with ESMTP id DA3BC37B422 for ; Thu, 17 May 2001 00:20:28 -0700 (PDT) (envelope-from grog@lemis.com) Received: by wantadilla.lemis.com (Postfix, from userid 1004) id D036F6ACBE; Thu, 17 May 2001 16:50:26 +0930 (CST) Date: Thu, 17 May 2001 16:50:26 +0930 From: Greg Lehey To: Marcus Reid Cc: Gabriel Ambuehl , Jonathan Fortin , questions@freebsd.org Subject: Re: Raid (BEST PERFORMANCE) Message-ID: <20010517165026.V12294@wantadilla.lemis.com> References: <007501c0d718$61d4d920$020a10ac@node00> <721044900156.20010508182226@buz.ch> <20010516220747.A3755@blazingdot.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5i In-Reply-To: <20010516220747.A3755@blazingdot.com>; from marcus@blazingdot.com on Wed, May 16, 2001 at 10:07:48PM -0700 Organization: LEMIS, PO Box 460, Echunga SA 5153, Australia Phone: +61-8-8388-8286 Fax: +61-8-8388-8725 Mobile: +61-418-838-708 WWW-Home-Page: http://www.lemis.com/~grog X-PGP-Fingerprint: 6B 7B C3 8C 61 CD 54 AF 13 24 52 F8 6D A4 95 EF Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG 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? Greg -- Finger grog@lemis.com for PGP public key See complete headers for address and phone numbers To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message