From owner-freebsd-questions@freebsd.org Thu Feb 18 21:13:20 2016 Return-Path: Delivered-To: freebsd-questions@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 75B85AADCEF for ; Thu, 18 Feb 2016 21:13:20 +0000 (UTC) (envelope-from mike@sentex.net) Received: from smarthost2.sentex.ca (smarthost2.sentex.ca [IPv6:2607:f3e0:80:80::2]) (using TLSv1 with cipher DHE-RSA-CAMELLIA256-SHA (256/256 bits)) (Client CN "smarthost.sentex.ca", Issuer "smarthost.sentex.ca" (not verified)) by mx1.freebsd.org (Postfix) with ESMTPS id 45E4B1EAA for ; Thu, 18 Feb 2016 21:13:20 +0000 (UTC) (envelope-from mike@sentex.net) Received: from lava.sentex.ca (lava.sentex.ca [IPv6:2607:f3e0:0:5::11]) by smarthost2.sentex.ca (8.15.2/8.15.2) with ESMTPS id u1ILDJ5a011467 (version=TLSv1 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Thu, 18 Feb 2016 16:13:19 -0500 (EST) (envelope-from mike@sentex.net) Received: from [IPv6:2607:f3e0:0:4:5c30:ed1b:e203:c55c] ([IPv6:2607:f3e0:0:4:5c30:ed1b:e203:c55c]) by lava.sentex.ca (8.14.9/8.14.9) with ESMTP id u1ILDIUc064704; Thu, 18 Feb 2016 16:13:18 -0500 (EST) (envelope-from mike@sentex.net) Subject: Re: ZFS + dovecot To: Paul Macdonald , freebsd-questions@freebsd.org References: <56C62724.60201@ifdnrg.com> <56C62F36.4050606@sentex.net> <56C632CC.7050003@ifdnrg.com> From: Mike Tancsa Organization: Sentex Communications Message-ID: <56C633E0.7050205@sentex.net> Date: Thu, 18 Feb 2016 16:13:04 -0500 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:38.0) Gecko/20100101 Thunderbird/38.6.0 MIME-Version: 1.0 In-Reply-To: <56C632CC.7050003@ifdnrg.com> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.78 X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 18 Feb 2016 21:13:20 -0000 On 2/18/2016 4:08 PM, Paul Macdonald wrote: > >> How upto date is your OS ? > > 10.1-RELEASE-p26 > it's kept up to date daily, I would probably go to 10.3R when it comes out. A lot of fixes and enhancements to the ZFS code. > >> L2 SSD is hardly touched >> > i was hoping for significant benefits by adding a big SSD L2ARC, your > metrics suggest this could have minimal effect. It might in your case. It seems a lot of my data is able to be cached. The disks are hardly very busy as I have a lot of RAM. > > are you running your services on SATA or SAS? SATA and SSD for the cache and logging. Nothing special disk wise. Oh, and yes, no way to defrag short of copying to a new raid set :( But I dont think your values sound too crazy. ---Mike -- ------------------- Mike Tancsa, tel +1 519 651 3400 Sentex Communications, mike@sentex.net Providing Internet services since 1994 www.sentex.net Cambridge, Ontario Canada http://www.tancsa.com/