From owner-freebsd-questions@FreeBSD.ORG Wed Feb 11 22:21:57 2009 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id AA5D4106564A for ; Wed, 11 Feb 2009 22:21:57 +0000 (UTC) (envelope-from erikt@midgard.homeip.net) Received: from ch-smtp02.sth.basefarm.net (ch-smtp02.sth.basefarm.net [80.76.149.213]) by mx1.freebsd.org (Postfix) with ESMTP id 10C7C8FC12 for ; Wed, 11 Feb 2009 22:21:57 +0000 (UTC) (envelope-from erikt@midgard.homeip.net) Received: from c83-255-48-78.bredband.comhem.se ([83.255.48.78]:52860 helo=falcon.midgard.homeip.net) by ch-smtp02.sth.basefarm.net with esmtp (Exim 4.68) (envelope-from ) id 1LXNSi-0002yb-7g for freebsd-questions@freebsd.org; Wed, 11 Feb 2009 23:21:45 +0100 Received: (qmail 2660 invoked from network); 11 Feb 2009 23:21:42 +0100 Received: from owl.midgard.homeip.net (10.1.5.7) by falcon.midgard.homeip.net with ESMTP; 11 Feb 2009 23:21:42 +0100 Received: (qmail 77377 invoked by uid 1001); 11 Feb 2009 23:21:42 +0100 Date: Wed, 11 Feb 2009 23:21:41 +0100 From: Erik Trulsson To: Wojciech Puchar Message-ID: <20090211222141.GA77345@owl.midgard.homeip.net> References: <499311AC.1060904@poughkeepsieschools.org> <20090211200740.GA76296@owl.midgard.homeip.net> <20090211221817.N77927@wojtek.tensor.gdynia.pl> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20090211221817.N77927@wojtek.tensor.gdynia.pl> User-Agent: Mutt/1.5.18 (2008-05-17) X-Originating-IP: 83.255.48.78 X-Scan-Result: No virus found in message 1LXNSi-0002yb-7g. X-Scan-Signature: ch-smtp02.sth.basefarm.net 1LXNSi-0002yb-7g 135a17f1e2b5c084a582884b545a8685 Cc: "B. Cook" , freebsd-questions@freebsd.org Subject: Re: zfs raid and/or hardware raid.. X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 11 Feb 2009 22:21:58 -0000 On Wed, Feb 11, 2009 at 10:18:42PM +0100, Wojciech Puchar wrote: > > RAID implementations (and most of the cheaper add-on RAID cards.) RAID that > > is supported in the BIOS have one advantage over other software > > implementations, and that is that you can boot from all supported RAID > > configurations, which is not always the case otherwise. > > always - if you use software RAID (gmirror) properly. gmirror handles only RAID-1 if I am not mistaken. That is the exception where you can boot from a RAID array even the BIOS does not know about it. (But I would worry about what would happen if you were trying to boot from a degraded RAID-1 array. What happens if the BIOS tries to boot the wrong disk?) For a RAID-0, RAID-5, or RAID-10 array on the other hand, I think it is not possible to boot from them unless you have a BIOS which understands the array format. -- Erik Trulsson ertr1013@student.uu.se