From owner-freebsd-fs@FreeBSD.ORG Thu Jul 19 17:19:18 2007 Return-Path: X-Original-To: freebsd-fs@freebsd.org Delivered-To: freebsd-fs@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id 9D3BD16A400 for ; Thu, 19 Jul 2007 17:19:18 +0000 (UTC) (envelope-from M.S.Powell@salford.ac.uk) Received: from abbe.salford.ac.uk (abbe.salford.ac.uk [146.87.0.10]) by mx1.freebsd.org (Postfix) with SMTP id 165A813C441 for ; Thu, 19 Jul 2007 17:19:17 +0000 (UTC) (envelope-from M.S.Powell@salford.ac.uk) Received: (qmail 66374 invoked by uid 98); 19 Jul 2007 18:19:16 +0100 Received: from 146.87.255.121 by abbe.salford.ac.uk (envelope-from , uid 401) with qmail-scanner-2.01 (clamdscan: 0.90/3700. spamassassin: 3.1.8. Clear:RC:1(146.87.255.121):. Processed in 0.042023 secs); 19 Jul 2007 17:19:16 -0000 Received: from rust.salford.ac.uk (HELO rust.salford.ac.uk) (146.87.255.121) by abbe.salford.ac.uk (qpsmtpd/0.3x.614) with SMTP; Thu, 19 Jul 2007 18:19:16 +0100 Received: (qmail 4940 invoked by uid 1002); 19 Jul 2007 17:19:14 -0000 Received: from localhost (sendmail-bs@127.0.0.1) by localhost with SMTP; 19 Jul 2007 17:19:14 -0000 Date: Thu, 19 Jul 2007 18:19:14 +0100 (BST) From: "Mark Powell" To: Pawel Jakub Dawidek In-Reply-To: <20070719135510.GE1194@garage.freebsd.pl> Message-ID: <20070719181313.G4923@rust.salford.ac.uk> References: <20070719102302.R1534@rust.salford.ac.uk> <20070719135510.GE1194@garage.freebsd.pl> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed Cc: freebsd-fs@freebsd.org Subject: Re: ZfS & GEOM with many odd drive sizes X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 19 Jul 2007 17:19:18 -0000 On Thu, 19 Jul 2007, Pawel Jakub Dawidek wrote: > On Thu, Jul 19, 2007 at 11:19:08AM +0100, Mark Powell wrote: >> What I want to know is, does the new volume have to be the same actual >> device name or can it be substituted with another? >> i.e. can I remove, for example, one of the 448GB gconcats e.g. gc1 and >> replace that with a new 750GB drive e.g. ad6? >> Eventually so that once all volumes are replaced the zpool could be, for >> example, 4x750GB or 2.25TB of usable storage. >> Many thanks for any advice on these matters which are new to me. > > All you described above should work. Thanks Pawel. For your response and much so for all your time spent working on ZFS. Should I expect much greater CPU usage with ZFS? I previously had a geom raid5 array which barely broke a sweat on benchmarks i.e simple large dd read and writes. With ZFS on the same hardware I notice 50-60% system CPU usage is usual during such tests. Before the network was a bottleneck, but now it's the zfs array. I expected it would have to do a bit more 'thinking', but is such a dramatic increase normal? Many thanks again. -- 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