Follow-up install questions
William A. Mahaffey III
wam at hiwaay.net
Thu Oct 15 13:49:36 UTC 2015
On 10/15/15 08:40, Adam Vande More wrote:
> On Thu, Oct 15, 2015 at 7:42 AM, William A. Mahaffey III
> <wam at hiwaay.net <mailto:wam at 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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