From: "Bryan J. Smith" <thebs413@yahoo.com>
To: Justin Piszcz <jpiszcz@lucidpixels.com>,
Ralf Gross <Ralf-Lists@ralfgross.de>
Cc: linux-xfs@oss.sgi.com
Subject: Re: mkfs options for a 16x hw raid5 and xfs (mostly large files)
Date: Tue, 25 Sep 2007 11:00:49 -0700 (PDT) [thread overview]
Message-ID: <498689.78850.qm@web32907.mail.mud.yahoo.com> (raw)
In-Reply-To: <Pine.LNX.4.64.0709251248210.15156@p34.internal.lan>
Justin Piszcz <jpiszcz@lucidpixels.com> wrote:
> Just out of curisosity have you tried SW RAID5 on this array?
> Also what do you get if you use RAID0 (hw or sw)?
According to him, if I read it correclty, it is an external FC RAID-5
chassis. I.e., all of the logic is in the chassis. So your question
is N/A.
Although I'm more than ready to be proven incorrect.
Furthermore, what benchmark do you use? If dd on the volume itself,
software RAID wins, hands down. Doesn't matter what size you give
it, it literally copies (and doesn't recalculate) the parity. It's
the rawest form of non-blocking I/O, and uses virtually no system
interconnect to the CPU (just pushes disk-mem-disk).
--
Bryan J. Smith Professional, Technical Annoyance
b.j.smith@ieee.org http://thebs413.blogspot.com
--------------------------------------------------
Fission Power: An Inconvenient Solution
next prev parent reply other threads:[~2007-09-25 18:00 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-09-23 9:38 mkfs options for a 16x hw raid5 and xfs (mostly large files) Ralf Gross
2007-09-23 12:56 ` Peter Grandi
2007-09-26 14:54 ` Ralf Gross
2007-09-26 16:27 ` [UNSURE] " Justin Piszcz
2007-09-26 16:54 ` Ralf Gross
2007-09-26 16:59 ` Justin Piszcz
2007-09-26 17:38 ` Bryan J. Smith
2007-09-26 17:41 ` Justin Piszcz
2007-09-26 17:55 ` Bryan J. Smith
2007-09-26 17:13 ` [UNSURE] " Bryan J. Smith
2007-09-26 17:27 ` Justin Piszcz
2007-09-26 17:35 ` Bryan J. Smith
2007-09-26 17:37 ` Justin Piszcz
2007-09-26 17:38 ` Justin Piszcz
2007-09-26 17:49 ` Bryan J. Smith
2007-09-27 15:22 ` Ralf Gross
2007-09-24 17:31 ` Ralf Gross
2007-09-24 18:01 ` Justin Piszcz
2007-09-24 20:39 ` Ralf Gross
2007-09-24 20:43 ` Justin Piszcz
2007-09-24 21:33 ` Ralf Gross
2007-09-24 21:36 ` Justin Piszcz
2007-09-24 21:52 ` Ralf Gross
2007-09-25 12:35 ` Ralf Gross
2007-09-25 12:50 ` Justin Piszcz
2007-09-25 13:44 ` Bryan J Smith
2007-09-25 12:57 ` KELEMEN Peter
2007-09-25 13:49 ` Ralf Gross
2007-09-25 14:08 ` Bryan J Smith
2007-09-25 16:07 ` Ralf Gross
2007-09-25 16:28 ` Bryan J. Smith
2007-09-25 17:25 ` Ralf Gross
2007-09-25 17:41 ` Bryan J. Smith
2007-09-25 19:13 ` Ralf Gross
2007-09-25 20:23 ` Bryan J. Smith
2007-09-25 16:48 ` Justin Piszcz
2007-09-25 18:00 ` Bryan J. Smith [this message]
2007-09-25 18:33 ` Ralf Gross
2007-09-25 23:38 ` Justin Piszcz
2007-09-26 8:23 ` Ralf Gross
2007-09-26 8:42 ` Justin Piszcz
2007-09-26 8:49 ` Ralf Gross
2007-09-26 9:52 ` Justin Piszcz
2007-09-26 15:03 ` Bryan J Smith
2007-09-26 15:15 ` Ralf Gross
2007-09-26 17:08 ` Bryan J. Smith
2007-09-26 16:24 ` Justin Piszcz
2007-09-26 17:11 ` Bryan J. Smith
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