From owner-freebsd-fs@FreeBSD.ORG Tue Nov 13 15:00:05 2012 Return-Path: Delivered-To: freebsd-fs@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id 50059FE6 for ; Tue, 13 Nov 2012 15:00:05 +0000 (UTC) (envelope-from jas@cse.yorku.ca) Received: from bronze.cs.yorku.ca (bronze.cs.yorku.ca [130.63.95.34]) by mx1.freebsd.org (Postfix) with ESMTP id 18A458FC16 for ; Tue, 13 Nov 2012 15:00:04 +0000 (UTC) Received: from [130.63.97.125] (ident=jas) by bronze.cs.yorku.ca with esmtp (Exim 4.76) (envelope-from ) id 1TYHy1-0002f6-LY; Tue, 13 Nov 2012 09:59:57 -0500 Message-ID: <50A2606D.3040306@cse.yorku.ca> Date: Tue, 13 Nov 2012 09:59:57 -0500 From: Jason Keltz User-Agent: Mozilla/5.0 (X11; Linux i686 on x86_64; rv:10.0.9) Gecko/20121011 Thunderbird/10.0.9 MIME-Version: 1.0 To: Bob Friesenhahn Subject: Re: RHEL to FreeBSD file server References: <50A130B7.4080604@cse.yorku.ca> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Spam-Score: -1.0 X-Spam-Level: - X-Spam-Report: Content preview: Thanks for your reply Bob! I've thought about adding more memory to the R720 which can go up to 768 GB. I'm just not quite sure how much we need, but it can never hurt to add more, I guess. I know you can never have too much memory!! :) [...] Content analysis details: (-1.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 SHORTCIRCUIT Not all rules were run, due to a shortcircuited rule -1.0 ALL_TRUSTED Passed through trusted hosts only via SMTP Cc: freebsd-fs@freebsd.org X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 13 Nov 2012 15:00:05 -0000 Thanks for your reply Bob! I've thought about adding more memory to the R720 which can go up to 768 GB. I'm just not quite sure how much we need, but it can never hurt to add more, I guess. I know you can never have too much memory!! :) Any specific suggested devices for the ZIL? Jason. On 11/12/2012 09:31 PM, Bob Friesenhahn wrote: > I am not able to attest to the type of configuration you are building. > It all sounds good to me and it would surely work fine with Solaris, > and so likely with FreeBSD as well. The only concern might be that 64 > GB of memory is not so much according to today's hardware standards. > New hardware is easily able to fit 128 GB, 256 GB, or even 512 GB. > > If the working set from all those clients is bigger than will fit in > 64 GB of RAM, then your disks will be working much harder than they > should be. With zfs, disks don't do any reading (reads will stall) > while zfs is writing a transaction group. A proper server should be > doing mostly writing because key data is already in cache. > > With so many clients, make sure that your intent log FLASH devices are > mirrored and be prepared to replace them periodically. > > Bob -- Jason Keltz Manager of Development Department of Computer Science and Engineering York University, Toronto, Canada Tel: 416-736-2100 x. 33570 Fax: 416-736-5872