Date: Wed, 25 Jul 2007 13:53:46 +0100 From: Doug Rabson <dfr@rabson.org> To: Mark Powell <M.S.Powell@salford.ac.uk> Cc: freebsd-fs@freebsd.org Subject: Re: ZfS & GEOM with many odd drive sizes Message-ID: <6FF8729F-B449-4EFA-B3C6-8B9A9E6F6C4F@rabson.org> In-Reply-To: <20070725120913.A57231@rust.salford.ac.uk> 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> <20070725120913.A57231@rust.salford.ac.uk>
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On 25 Jul 2007, at 12:17, Mark Powell wrote: > 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? The code is close to being able to support collections of mirrors. No raidz or raidz2 for now though. > >>> 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 That sounds right.
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