From owner-freebsd-fs@FreeBSD.ORG Tue Nov 22 00:40:19 2011 Return-Path: Delivered-To: freebsd-fs@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 90BE51065672 for ; Tue, 22 Nov 2011 00:40:19 +0000 (UTC) (envelope-from lars@w9zeb.org) Received: from mail-yw0-f54.google.com (mail-yw0-f54.google.com [209.85.213.54]) by mx1.freebsd.org (Postfix) with ESMTP id 5735E8FC13 for ; Tue, 22 Nov 2011 00:40:19 +0000 (UTC) Received: by ywe9 with SMTP id 9so7606936ywe.13 for ; Mon, 21 Nov 2011 16:40:18 -0800 (PST) Received: by 10.236.78.229 with SMTP id g65mr24162491yhe.4.1321920711713; Mon, 21 Nov 2011 16:11:51 -0800 (PST) Received: from [192.168.11.53] (c-98-220-172-7.hsd1.in.comcast.net. [98.220.172.7]) by mx.google.com with ESMTPS id 4sm33870380ano.9.2011.11.21.16.11.49 (version=SSLv3 cipher=OTHER); Mon, 21 Nov 2011 16:11:50 -0800 (PST) Message-ID: <4ECAE8C0.7080306@w9zeb.org> Date: Mon, 21 Nov 2011 19:11:44 -0500 From: "Lars R. Noldan" User-Agent: Mozilla/5.0 (X11; SunOS i86pc; rv:6.0.2) Gecko/20111003 Thunderbird/6.0.2 MIME-Version: 1.0 To: freebsd-fs@freebsd.org References: <20111122000726.GA46653@weta.local> In-Reply-To: <20111122000726.GA46653@weta.local> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Subject: Re: tune ZFS for fast clone and creation? 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: Tue, 22 Nov 2011 00:40:19 -0000 On 11/21/11 07:07 PM, Ian Downes wrote: > Hello, > > I know ZFS is already 'fast' with COW clones etc., but can ZFS be tuned > for faster clone and creation? The fast random access of a SSD helps but > what other options are there? Tuning caches? Different zpool layouts? > ...? > > I haven't been able to find any info so any suggestions would be > welcome! > > some basic experiments: > > zpool with a single 500 GB 7200 rpm consumer HDD > zpool with a single 64 GB consumer SSD > > zfs create: > 250 ms on HDD > 110 ms on SSD > > zfs clone: (about 1 GB of mixed size) > 250 ms on HDD > 85 ms on SSD > > _______________________________________________ > freebsd-fs@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-fs > To unsubscribe, send any mail to "freebsd-fs-unsubscribe@freebsd.org" Hello Ian, Our storage configuration has 7 spindles in a RaidZ2, 2 SSDs as a ZFS mirrored ZIL, and 2 SSDs as a zfs L2ARC cache. Adding a fast ZIL and L2ARC certainly won't hurt your performance. If that L2ARC was something like a Fusion-IO it'd be faster still I imagine. Lars