Date: Thu, 17 Nov 2005 16:53:36 +0100 From: Peter Schuller <peter.schuller@infidyne.com> To: Reinhard <tequnix@callooh.com> Cc: freebsd-questions@freebsd.org Subject: Re: gmirror, gvinum or ccd to mirror root-filesystem under 6.0R Message-ID: <20051117155335.GA6921@starfury.scode.org> In-Reply-To: <20051116144536.26789ba2@jadzia.intern.creative.co.at> References: <20051116144536.26789ba2@jadzia.intern.creative.co.at>
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> i plan to install 6.0-R in near future and ask myself if i should use > gmirror, ccd or gvinum (again) for software-raid for mirroring the root > file-system, as to: > - reliability, stability issues > - performance issues > - minimum installation/configuration effort > - advantages / disadvantages of gmirror vs. ccd vs. gvinum > > what are the experiences here ? Personally I currently do not trust vinum at all (any and all of my edge case tests / simulated hardware failures have turned into disasters). ccd I haven't tried, but I have set up root-on-gmirror on at three machines so far. I am very happy with gmirror; I have only observed two major problems so far. Firstly, geom/geom_mirror seems to obtain an exclusive open of the drive. this makes it a royal pain to update the boot sector of a drive while the system is booted with geom having claimed the device (and it doesnt help that boot0cfg does not report the error properly (and the patch i sent has been ignored so far)) Secondly, on at least one occation, the total failure of a mirror (rebuild test and the drive being rebuilt FROM had a bad sector) resulted in a kernel panic. The filesystem was mounted at the time, so I presume this isn't a problem with geom_mirror per se, but rather has to do with an attempt to access a destroyed geom or similar. (This wasn't the root filesystem btw - if it was the root filesystem then the system has a right to panic :)) -- / Peter Schuller, InfiDyne Technologies HB PGP userID: 0xE9758B7D or 'Peter Schuller <peter.schuller@infidyne.com>' Key retrieval: Send an E-Mail to getpgpkey@scode.org E-Mail: peter.schuller@infidyne.com Web: http://www.scode.org
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