From: Stan Hoeppner <stan@hardwarefreak.com>
To: David Brown <david.brown@hesbynett.no>,
Steve Bergman <sbergman27@gmail.com>
Cc: linux-raid@vger.kernel.org
Subject: Re: Linux MD? Or an H710p?
Date: Tue, 22 Oct 2013 11:56:49 -0500 [thread overview]
Message-ID: <5266AE51.4050501@hardwarefreak.com> (raw)
In-Reply-To: <52662849.1080003@hesbynett.no>
On 10/22/2013 2:24 AM, David Brown wrote:
> On 22/10/13 02:36, Steve Bergman wrote:
>
> <snip>
>
>> But hey, this is going to be a very nice opportunity for observing XFS's
>> savvy with parallel i/o.
>
> You mentioned using a 6-drive RAID10 in your first email, with XFS on
> top of that. Stan is the expert here, but my understanding is that you
> should go for three 2-drive RAID1 pairs, and then use an md linear
> "raid" for these pairs and put XFS on top of that in order to get the
> full benefits of XFS parallelism.
XFS on a concatenation, which is what you described above, is a very
workload specific storage architecture. It is not a general use
architecture, and almost never good for database workloads. Here most
of the data is stored in a single file or a small set of files, in a
single directory. With such a DB workload and 3 concatenated mirrors,
only 1/3rd of the spindles would see the vast majority of the IO.
--
Stan
next prev parent reply other threads:[~2013-10-22 16:56 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-10-20 0:49 Linux MD? Or an H710p? Steve Bergman
2013-10-20 7:37 ` Stan Hoeppner
2013-10-20 8:50 ` Mikael Abrahamsson
2013-10-21 14:18 ` John Stoffel
2013-10-22 0:36 ` Steve Bergman
2013-10-22 7:24 ` David Brown
2013-10-22 15:29 ` keld
2013-10-22 16:56 ` Stan Hoeppner [this message]
2013-10-23 7:03 ` David Brown
2013-10-24 6:23 ` Stan Hoeppner
2013-10-24 7:26 ` David Brown
2013-10-25 9:34 ` Stan Hoeppner
2013-10-25 11:42 ` David Brown
2013-10-26 9:37 ` Stan Hoeppner
2013-10-27 22:08 ` David Brown
2013-10-22 16:43 ` Stan Hoeppner
-- strict thread matches above, loose matches on Subject: below --
2013-10-23 19:05 Drew
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=5266AE51.4050501@hardwarefreak.com \
--to=stan@hardwarefreak.com \
--cc=david.brown@hesbynett.no \
--cc=linux-raid@vger.kernel.org \
--cc=sbergman27@gmail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).