From owner-freebsd-hackers Thu Apr 6 09:20:20 1995 Return-Path: hackers-owner Received: (from majordom@localhost) by freefall.cdrom.com (8.6.10/8.6.6) id JAA01263 for hackers-outgoing; Thu, 6 Apr 1995 09:20:20 -0700 Received: from brasil.moneng.mei.com (brasil.moneng.mei.com [151.186.20.4]) by freefall.cdrom.com (8.6.10/8.6.6) with SMTP id JAA01257 for ; Thu, 6 Apr 1995 09:20:18 -0700 Received: by brasil.moneng.mei.com (4.1/SMI-4.1) id AA13152; Thu, 6 Apr 95 11:18:08 CDT From: Joe Greco Message-Id: <9504061618.AA13152@brasil.moneng.mei.com> Subject: Re: large filesystems/multiple disks [RAID] To: henrich@crh.cl.msu.edu (Charles Henrich) Date: Thu, 6 Apr 1995 11:18:07 -0500 (CDT) Cc: freebsd-hackers@FreeBSD.org In-Reply-To: <199504061544.IAA29924@freefall.cdrom.com> from "Charles Henrich" at Apr 6, 95 11:44:37 am X-Mailer: ELM [version 2.4 PL24] Content-Type: text Content-Length: 976 Sender: hackers-owner@FreeBSD.org Precedence: bulk > >How about disk mirroring ? If you have a _mirrored_ database on two 2G > >disks and then add 2x2G (or may be 1x4G) and get spanned mirrored database. > >You get reliability due to mirroring and easy expansion due to spanning. > > That would be most entirely useful. These days with disk prices being what > they are, mirroring is cheaper than a true RAID solution (heck of alot faster > too :) So, technical merits of striping vs. mirroring vs. RAID aside, does anybody have a pointer to a sample implementation of *anything*? I was looking at the DEC ULTRIX ds driver man page this morning, and it sounds like a fairly simple and easy strategy to follow, although not particularly flexible. Does anyone know of anything like this that's already out there? ... Joe ------------------------------------------------------------------------------- Joe Greco - Systems Administrator jgreco@ns.sol.net Solaria Public Access UNIX - Milwaukee, WI 414/342-4847