Date: Wed, 25 Jul 2007 12:17:21 +0100 (BST) From: "Mark Powell" <M.S.Powell@salford.ac.uk> To: Doug Rabson <dfr@rabson.org> Cc: freebsd-fs@freebsd.org Subject: Re: ZfS & GEOM with many odd drive sizes Message-ID: <20070725120913.A57231@rust.salford.ac.uk> In-Reply-To: <3A5D89E1-A7B1-4B10-ADB8-F58332306691@rabson.org> References: <20070719102302.R1534@rust.salford.ac.uk> <20070719135510.GE1194@garage.freebsd.pl> <20070719181313.G4923@rust.salford.ac.uk> <20070721065204.GA2044@garage.freebsd.pl> <20070725095723.T57231@rust.salford.ac.uk> <1185355848.3698.7.camel@herring.rabson.org> <20070725103746.N57231@rust.salford.ac.uk> <3A5D89E1-A7B1-4B10-ADB8-F58332306691@rabson.org>
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On Wed, 25 Jul 2007, Doug Rabson wrote: >> gmirror is only going to used for the ufs /boot parition and block device >> swap. (I'll ignore the smallish space used by that below.) > > Just to muddy the waters a little - I'm working on ZFS native boot code at > the moment. It probably won't ship with 7.0 but should be available shortly > after. Great work. That will be zfs mirror only right? >> I believe my reasoning is correct here? Let me know if your experience >> would suggest otherwise. > > Your reasoning sounds fine now that I have the bigger picture in my head. I > don't have a lot of experience here - for my ZFS testing, I just bought a > couple of cheap 300GB drives which I'm using as a simple mirror. From what I > have read, mirrors and raidz2 are roughly equivalent in 'mean time to data > loss' terms with raidz1 quite a bit less safe due to the extra vulnerability > window between a drive failure and replacement. So back to my original question :) If one drive in a gconcat gc1 (ad2s2+ad3s2), say ad3 fails, and the broken gconcat is completely replaced with a new 500GB drive ad2, is fixing that as simple as: zpool replace tank gc1 ad2 Many thanks. -- Mark Powell - UNIX System Administrator - The University of Salford Information Services Division, Clifford Whitworth Building, Salford University, Manchester, M5 4WT, UK. Tel: +44 161 295 4837 Fax: +44 161 295 5888 www.pgp.com for PGP key
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