Date: Wed, 25 Jul 2007 10:23:44 +0100 (BST) From: "Mark Powell" <M.S.Powell@salford.ac.uk> To: Pawel Jakub Dawidek <pjd@FreeBSD.org> Cc: freebsd-fs@freebsd.org Subject: Re: ZfS & GEOM with many odd drive sizes Message-ID: <20070725095723.T57231@rust.salford.ac.uk> In-Reply-To: <20070721065204.GA2044@garage.freebsd.pl> References: <20070719102302.R1534@rust.salford.ac.uk> <20070719135510.GE1194@garage.freebsd.pl> <20070719181313.G4923@rust.salford.ac.uk> <20070721065204.GA2044@garage.freebsd.pl>
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On Sat, 21 Jul 2007, Pawel Jakub Dawidek wrote: Thanks for your reply. > Be sure to turn off debugging, ie. remove WITNESS, INVARIANTS and > INVARIANT_SUPPORT options from your kernel configuration. > Other than that, ZFS may just be more CPU hungry... I have. Makes little difference. Think the idea of using an Athlon XP for ZFS has turned out to be a bridge too far. The new 65nm Athlon 64 x2 are very cheap now. Time for an upgrade. You said that replacing one device with another is not a problem. Just to be clear on this as it's a key factor in me going with this solution. I hope this isn't too naive a question, but the answer will be here for others :) Suppose instead of gconcat I used gstripe on the 250+200 combinations: i.e. (slice 1 on all drives is reserved for ufs gmirror of /boot and block device swap) gs0 ad0s2 ad1s2 gs1 ad2s2 ad3s2 gs2 ad4s2 ad5s2 I use these gstripes and the single 400GB drive to construct the zpool: zpool create tank raidz /dev/mirror/gs0 /dev/mirror/gs1 /dev/mirror/gs2 ad6s2 If for example ad3 fails and thus gs1 fails, how is this replaced in the zpool? e.g. suppose I replace both ad2 and ad3 with a new 500GB drive as ad2. Is fixing this as simple as: zpool replace tank /dev/mirror/gs1 ad2s2 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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