From: Stan Hoeppner <stan@hardwarefreak.com>
To: Pol Hallen <raid1@fuckaround.org>
Cc: Erwan Leroux <erwan.lerou@gmail.com>, linux-raid@vger.kernel.org
Subject: Re: standard performance (write speed 65Mb/s)
Date: Thu, 21 Jul 2011 19:24:12 -0500 [thread overview]
Message-ID: <4E28C32C.1020701@hardwarefreak.com> (raw)
In-Reply-To: <201107211957.16493.raid1@fuckaround.org>
On 7/21/2011 12:57 PM, Pol Hallen wrote:
> dd if=/dev/zero of=/dev/md0 bs=1024M count=10
> 10+0 records in
> 10+0 records out
> 10737418240 bytes (11 GB) copied, 166.042 s, 64.7 MB/s
Do you not recall that I explained in detail, not two days ago, why you
should not use a 1GB block size when testing with dd in this manner?
And don't do this with the raw device. The resulting numbers, no matter
how large or small, are irrelevant.
*Put a filesystem on md0* and do:
~$ dd if=/dev/zero of=/some/dir/test.dd bs=4096 count=2621440
And why on earth would you bother running this test while the array is
still building? Again, the resulting figure is worthless to everyone.
--
Stan
next prev parent reply other threads:[~2011-07-22 0:24 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-18 12:03 standard performance (write speed 20Mb/s) Pol Hallen
2011-07-20 12:31 ` Stan Hoeppner
2011-07-20 20:02 ` Pol Hallen
[not found] ` <CADNH=7HR7euaWem0tpLxJfRe0hYnRP5fwxJ6MC5vJeNf=T=PzA@mail.gmail.com>
2011-07-21 0:02 ` Stan Hoeppner
2011-07-21 6:57 ` Mathias Burén
2011-07-21 8:55 ` Erwan Leroux
2011-07-21 15:06 ` Paweł Brodacki
2011-07-21 15:30 ` Erwan Leroux
2011-07-21 15:42 ` Erwan Leroux
2011-07-25 6:39 ` Paweł Brodacki
2011-07-21 17:57 ` standard performance (write speed 65Mb/s) Pol Hallen
2011-07-22 0:24 ` Stan Hoeppner [this message]
2011-07-22 11:34 ` Pol Hallen
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=4E28C32C.1020701@hardwarefreak.com \
--to=stan@hardwarefreak.com \
--cc=erwan.lerou@gmail.com \
--cc=linux-raid@vger.kernel.org \
--cc=raid1@fuckaround.org \
/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).