From owner-freebsd-questions@freebsd.org Thu Oct 15 13:49:36 2015 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 84B8AA15A31 for ; Thu, 15 Oct 2015 13:49:36 +0000 (UTC) (envelope-from wam@hiwaay.net) Received: from fly.hiwaay.net (fly.hiwaay.net [216.180.54.1]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 5287E13B3 for ; Thu, 15 Oct 2015 13:49:35 +0000 (UTC) (envelope-from wam@hiwaay.net) Received: from kabini1.local (dynamic-216-186-213-32.knology.net [216.186.213.32] (may be forged)) (authenticated bits=0) by fly.hiwaay.net (8.13.8/8.13.8/fly) with ESMTP id t9FDnRqe021880 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES128-SHA bits=128 verify=NO) for ; Thu, 15 Oct 2015 08:49:28 -0500 Subject: Re: Follow-up install questions References: <561F9FAC.9080308@hiwaay.net> Cc: FreeBSD Questions !!!! From: "William A. Mahaffey III" Message-ID: <561FAEE7.2030505@hiwaay.net> Date: Thu, 15 Oct 2015 08:54:57 -0453.75 User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:38.0) Gecko/20100101 Thunderbird/38.3.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit X-Content-Filtered-By: Mailman/MimeDel 2.1.20 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, 15 Oct 2015 13:49:36 -0000 On 10/15/15 08:40, Adam Vande More wrote: > On Thu, Oct 15, 2015 at 7:42 AM, William A. Mahaffey III > > wrote: > > Pursuant to ongoing issues trying to install FreeBSD 9.3R on my > Myth-TV box, I have some questions about provisioning another box, > also w/ 9.3R. That box is AMD A-10 APU based, w/ 8X 1 TB 2.5" > HDD's. Given the problems I am having getting the (smaller, > simpler box) going. I am pondering using ZFS on the larger box. To > that end, I have a couple of questions. ZFS supports (man page) > 'unmirrored pools'. Is that tantamount to striped RAID ? If so, > what sort of I/O performance can I look for there ? There was a > lengthy thread a few weeks ago on ZFS & performance. I (think I) > recall someone saying they used a bunch of 1-HDD vdevs to get some > semblance of good I/O performance w/ a RAIDZn configuration, is > that (additional layer of config) actually required ? My man page > says vdev's can be single devices or 'a collection of devices', > with devices being disks (individual HDD's ?), files, mirrors, or > raidz's. Are those mirrors necessarily ZFS mirrors, or can they be > gmirrors ? I am interested in maximizing the size of the storage > pool available, & the best I/O performance I can get. This box > will be backed up across the LAN onto other boxen, so I am > worrying less about HDD reliability & more about performance & max > available GiB's/TiB's. TIA & have a good one. > > > > Why is speed such a concern for you? A single SATA is easily enough > to read and write multiple 1080p streams concurrently. > > What do you have against white space? It's too painful to read further. > > -- > Adam I am not streaming 1080p streams on this box, that would be on the smaller MythTV box. I will be using the larger box to compile in-house analysis code (predominantly CFD, some FEA) & run validation cases, some of which can/will produce prodigious amounts of output, ASCII & binary. Larger data sets can take plural min. to write on linux mdadm RAID0's, current 1st-hand experience w/ the incumbent 1-box compile-farm-&-validation box, Intel based. I/O performance *IS* an issue for me, sorry for the bother. I configure *ALL* of my boxen to possibly serve as validation & calculation boxen, maxed-out RAM & generous swap space. Again, sorry for that bother. I am planning to follow the wiki page (https://wiki.freebsd.org/RootOnZFS/GPTZFSBoot/9.0-RELEASE) closely, obviously w/ more HDD's, in my setup, with just the one (1) question about 'unmirrored zpools'. That page implies that *any* zpool configuration will work, I am just trying to verify that & save myself as many bumps in the road & wasted time as possible. TIA for any further help & experience or sage advice. Have a good one. & WTF about white space ? -- William A. Mahaffey III ---------------------------------------------------------------------- "The M1 Garand is without doubt the finest implement of war ever devised by man." -- Gen. George S. Patton Jr.