From owner-freebsd-current@FreeBSD.ORG Wed Apr 7 17:33:37 2010 Return-Path: Delivered-To: current@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 64086106566C for ; Wed, 7 Apr 2010 17:33:37 +0000 (UTC) (envelope-from dan@dan.emsphone.com) Received: from email1.allantgroup.com (email1.emsphone.com [199.67.51.115]) by mx1.freebsd.org (Postfix) with ESMTP id 2701E8FC24 for ; Wed, 7 Apr 2010 17:33:36 +0000 (UTC) Received: from dan.emsphone.com (dan.emsphone.com [199.67.51.101]) by email1.allantgroup.com (8.14.0/8.14.0) with ESMTP id o37HXY8C009723 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Wed, 7 Apr 2010 12:33:34 -0500 (CDT) (envelope-from dan@dan.emsphone.com) Received: from dan.emsphone.com (smmsp@localhost [127.0.0.1]) by dan.emsphone.com (8.14.4/8.14.3) with ESMTP id o37HXYmM018358 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Wed, 7 Apr 2010 12:33:34 -0500 (CDT) (envelope-from dan@dan.emsphone.com) Received: (from dan@localhost) by dan.emsphone.com (8.14.4/8.14.3/Submit) id o37HXYKO018357; Wed, 7 Apr 2010 12:33:34 -0500 (CDT) (envelope-from dan) Date: Wed, 7 Apr 2010 12:33:34 -0500 From: Dan Nelson To: krad Message-ID: <20100407173334.GC76941@dan.emsphone.com> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-OS: FreeBSD 8.0-STABLE User-Agent: Mutt/1.5.20 (2009-06-14) X-Virus-Scanned: clamav-milter 0.95.3 at email1.allantgroup.com X-Virus-Status: Clean X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-2.0.2 (email1.allantgroup.com [199.67.51.78]); Wed, 07 Apr 2010 12:33:34 -0500 (CDT) X-Scanned-By: MIMEDefang 2.45 Cc: Freddie Cash , current@freebsd.org Subject: Re: When will we can use ZFS v24? X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 07 Apr 2010 17:33:37 -0000 In the last episode (Apr 07), krad said: > On 7 April 2010 05:38, Freddie Cash wrote: > > On Tue, Apr 6, 2010 at 9:35 PM, lhmwzy wrote: > > > What's your mean?? > > > > See the archives for the freebsd-fs mailing list. There are two > > separate groups working on getting ZFSv22 added to FreeBSD 9-CURRENT. > > And there's work ongoing to get ZFSv15 added to FreeBSD 8-STABLE. > > > > IOW, just be patient. Good things will come to those who wait. ;) > > If you re hankering for dedup you better have a big box as its a complete > resource hog. From what we have seen on our x4500 filers we need about > 100gig of ram or l2arc ssd to hold the all the metadata for the 34TB of > storage, otherwise the system grinds to a halt. I wish they had an option for "opportunistic" dedup, where if a block is already in ARC it can be a dedupe candidate, but it won't look it up in the DDT if it isn't already in memory. That catches the simple "cp -R dir1 dir2" cases without blowing up the ARC on DDT blocks that 99.9999% of the time don't match. -- Dan Nelson dnelson@allantgroup.com