Date: Tue, 3 Nov 1998 17:05:03 -0500 (EST) From: Steve Ames <steve@ns1.cioe.com> To: steve@inc.net, steve@ns1.cioe.com Cc: freebsd-isp@FreeBSD.ORG Subject: Re: disk mirroring? Message-ID: <199811032205.RAA17243@ns1.cioe.com> In-Reply-To: <363F7C79.AEA2279C@inc.net>
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> > Can anyone recommend a non-hardware method of disk mirroring? What > > I'm looking for is something akin to disk mirroring under NT4. ie > > I add another drive, declare it and an old disk part of a mirror > > set and data gets replicated and then subsequent writes go to both > > drives. > > man ccd > > Should do what you need... Nope. ccd suffers from the same problems (for this application) as vinum: - requires that you start with either 'ccd' devices or 'vinum' volumes (existing data partitions need to be copied off and then back on...) - no real support for mirroring the 'root' partition What I really need is an abstraction layer above the standard disk devices where I can group a couple of standard disk partitiions together and achieve simultaneous writes (ie I write to the abstract layer, it writes to both partitions)... ccd and vinum both seem to do this but what I don't see is the ability to stop using vinum and just use the single partition if something happens to the other drive. Also I can't seem to stripe. Everything comes out concatentated :) Then there the issue of no 'root' partition support. -Steve To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-isp" in the body of the message
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