Date: Wed, 11 Feb 2009 23:21:41 +0100 From: Erik Trulsson <ertr1013@student.uu.se> To: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl> Cc: "B. Cook" <bcook@poughkeepsieschools.org>, freebsd-questions@freebsd.org Subject: Re: zfs raid and/or hardware raid.. Message-ID: <20090211222141.GA77345@owl.midgard.homeip.net> In-Reply-To: <20090211221817.N77927@wojtek.tensor.gdynia.pl> References: <499311AC.1060904@poughkeepsieschools.org> <20090211200740.GA76296@owl.midgard.homeip.net> <20090211221817.N77927@wojtek.tensor.gdynia.pl>
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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. -- <Insert your favourite quote here.> Erik Trulsson ertr1013@student.uu.se
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