Date: Thu, 15 Oct 2015 08:54:57 -0453.75 From: "William A. Mahaffey III" <wam@hiwaay.net> Cc: FreeBSD Questions !!!! <freebsd-questions@freebsd.org> Subject: Re: Follow-up install questions Message-ID: <561FAEE7.2030505@hiwaay.net> In-Reply-To: <CA%2BtpaK1v=e8avEBEuHJKpcRnPXpqes7iBBgpsmgOpkWv=ah8pQ@mail.gmail.com> References: <561F9FAC.9080308@hiwaay.net> <CA%2BtpaK1v=e8avEBEuHJKpcRnPXpqes7iBBgpsmgOpkWv=ah8pQ@mail.gmail.com>
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On 10/15/15 08:40, Adam Vande More wrote: > On Thu, Oct 15, 2015 at 7:42 AM, William A. Mahaffey III > <wam@hiwaay.net <mailto:wam@hiwaay.net>> 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.
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