From owner-freebsd-geom@FreeBSD.ORG Wed Jan 8 15:00:20 2014 Return-Path: Delivered-To: freebsd-geom@FreeBSD.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id 0D94B7DD for ; Wed, 8 Jan 2014 15:00:20 +0000 (UTC) Received: from elsa.codelab.cz (elsa.codelab.cz [94.124.105.4]) (using TLSv1 with cipher ADH-CAMELLIA256-SHA (256/256 bits)) (No client certificate requested) by mx1.freebsd.org (Postfix) with ESMTPS id BAC8511D6 for ; Wed, 8 Jan 2014 15:00:19 +0000 (UTC) Received: from elsa.codelab.cz (localhost [127.0.0.1]) by elsa.codelab.cz (Postfix) with ESMTP id 8638328427; Wed, 8 Jan 2014 16:00:11 +0100 (CET) Received: from [192.168.1.2] (ip-89-177-49-222.net.upcbroadband.cz [89.177.49.222]) (using TLSv1 with cipher DHE-RSA-CAMELLIA256-SHA (256/256 bits)) (No client certificate requested) by elsa.codelab.cz (Postfix) with ESMTPSA id C000D28422; Wed, 8 Jan 2014 16:00:07 +0100 (CET) Message-ID: <52CD67F7.2060608@quip.cz> Date: Wed, 08 Jan 2014 16:00:07 +0100 From: Miroslav Lachman <000.fbsd@quip.cz> User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.9.1.19) Gecko/20110420 Lightning/1.0b1 SeaMonkey/2.0.14 MIME-Version: 1.0 To: Steven Hartland Subject: Re: Is TRIM working with gmirror? References: <52A90049.7050001@quip.cz> <18C59233568D3A475FF0D843@study64.tdx.co.uk> <52CB2915.7060602@quip.cz> <7FBCC53840FA45928B9F527EA235B632@multiplay.co.uk> <52CB4C9E.3020904@quip.cz> <41F7CA403B574953B72B6CF4D1DDE71D@multiplay.co.uk> <52CBEE9E.2090800@quip.cz> <353E7C512D234EDE84863C872D7856DE@multiplay.co.uk> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: Karl Pielorz , freebsd-geom@FreeBSD.org X-BeenThere: freebsd-geom@freebsd.org X-Mailman-Version: 2.1.17 Precedence: list List-Id: GEOM-specific discussions and implementations List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 08 Jan 2014 15:00:20 -0000 Steven Hartland wrote: > ----- Original Message ----- From: "Steven Hartland" > > >> ----- Original Message ----- From: "Miroslav Lachman" <000.fbsd@quip.cz> >> >>> Steven Hartland wrote: >>> [...] >>>> Unless you have a specific reason for using gmirror I would strongly >>>> advise trying ZFS instead, it will definitely support TRIM in that >>>> config and comes with a host of other benefits too :) >>> >>> The specific reason is performance and memory consumption. We need >>> every piece of performance and all memory to MySQL daemon, so this is >>> why gmirror was choosen. >>> We have ZFS on other purposes machines for years (from 7.x days), so >>> I can say "I have a lot of experiences" (good and bad too). >>> In some tests, ZFS is about 50% slower than UFS. >>> >>> What about graid(8) mirror instead of gmirror(8)? Is there better >>> support for TRIM on UFS? >> >> Actually looking at it gmirror should support delete no problem see >> g_mirror_init_disk GEOM::candelete. >> >> So you might want to add some debugging around there to see whats >> happening. > > Double checked this on HEAD and it definitely works as expected. I am not able to understand C sources, so I cannot check it myself. But if it is supported, why I see the warning message at boot? Miroslav Lachman