From owner-freebsd-geom@FreeBSD.ORG Sat Sep 22 11:37:48 2007 Return-Path: Delivered-To: freebsd-geom@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 9AF6E16A41A for ; Sat, 22 Sep 2007 11:37:48 +0000 (UTC) (envelope-from softsearch@gmail.com) Received: from fk-out-0910.google.com (fk-out-0910.google.com [209.85.128.187]) by mx1.freebsd.org (Postfix) with ESMTP id 1E82E13C455 for ; Sat, 22 Sep 2007 11:37:47 +0000 (UTC) (envelope-from softsearch@gmail.com) Received: by fk-out-0910.google.com with SMTP id b27so1354108fka for ; Sat, 22 Sep 2007 04:37:46 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=beta; h=domainkey-signature:received:received:date:from:reply-to:organization:x-priority:message-id:to:subject:in-reply-to:references:mime-version:content-type:content-transfer-encoding; bh=w38MFCz/frsczquh9fAv2QUflYaP6WEbSr0mU/6GPXA=; b=qEbsbJEYZdhcH2m4ou3PohKjrW+uJxFwvHQ06GkMyj11XD3MPh4glvCg5oxbf6SlIlxWQHbJ7gxLRSuFmLe3hSD+ueiw2td+qHGvaqLsnHJxMco8Ls35YdDG+Xo4Ppai2mChcOGmmw5kCJzsKl/IxyGMdVEMRgdKh4/Kn1iqbik= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta; h=received:date:from:reply-to:organization:x-priority:message-id:to:subject:in-reply-to:references:mime-version:content-type:content-transfer-encoding; b=MmQS30FxdyxsUBxOrhFWOrlIbwRd0NtlUTJtVwaMTq5ILNhnvvIs3h5UjHrl0b26FfsCXQqGd2sCZJSNNy0prN91zRyQLbcWF1RbqFcrKpfwF+KUjxsCzgVBlm8GiBxeHmsH6bc0a2ExWj/aYOxAYfMCu02A0HVud/4bC0A5AZk= Received: by 10.82.178.11 with SMTP id a11mr2056692buf.1190461066156; Sat, 22 Sep 2007 04:37:46 -0700 (PDT) Received: from ?81.200.123.45? ( [81.200.123.45]) by mx.google.com with ESMTPS id d2sm1968667nfc.2007.09.22.04.37.44 (version=SSLv3 cipher=OTHER); Sat, 22 Sep 2007 04:37:45 -0700 (PDT) Date: Sat, 22 Sep 2007 15:37:12 +0400 From: Michael Monashev Organization: SoftSearch.ru X-Priority: 3 (Normal) Message-ID: <135686599.20070922153712@gmail.com> To: Pawel Jakub Dawidek In-Reply-To: <20070922011847.GH9445@garage.freebsd.pl> References: <20070921143318.GC5690@garage.freebsd.pl> <20070921170506.GB9445@garage.freebsd.pl> <1310567292.20070921235802@gmail.com> <20070922011847.GH9445@garage.freebsd.pl> MIME-Version: 1.0 Content-Type: text/plain; charset=Windows-1251 Content-Transfer-Encoding: 8bit Subject: Re[2]: raidtest for zfs X-BeenThere: freebsd-geom@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: Michael Monashev List-Id: GEOM-specific discussions and implementations List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 22 Sep 2007 11:37:48 -0000 Здравствуйте, Pawel. > What's strange about those results? Can you show us 'zpool status' and > explain what you expect and why? > zpool status pool: tank state: ONLINE scrub: none requested config: NAME STATE READ WRITE CKSUM tank ONLINE 0 0 0 raidz1 ONLINE 0 0 0 ad6s1 ONLINE 0 0 0 ad8s2 ONLINE 0 0 0 ad10s3 ONLINE 0 0 0 ad12s1 ONLINE 0 0 0 ad14s2 ONLINE 0 0 0 errors: No known data errors I compare graid5, graid3+gcache, raidz. My target is find software RAID with better read performance and huge storage size. I planing place a lot of little (1-100kb) images on it. Here is my test results: http://michael.mindmix.ru/168-958-rezul-taty-testirovanija-graid5-graid3-gcache-i-raidz.zhtml graid3+gcache with round-robin reading is 1.25 faster than 1 disk. graid5 is 2.18 faster than 1 disk. raidz is 7.7 faster than 1 disk. 5 disks cant read faster than 5 times. raidz is 7.7 faster than 1 disk! This is strange for me. >> [...] How to turn off zfs cache completely? > You can't, but for reading you just need to export/import your pool to > get rid of existing cache. -- С уважением, Michael mailto:softsearch@gmail.com