From: Stan Hoeppner <stan@hardwarefreak.com>
To: Pol Hallen <raid1@fuckaround.org>
Cc: linux-raid@vger.kernel.org
Subject: Re: standard performance (write speed 20Mb/s)
Date: Sun, 17 Jul 2011 18:03:09 -0500 [thread overview]
Message-ID: <4E236A2D.3070307@hardwarefreak.com> (raw)
In-Reply-To: <ac6850f9420970de26472b6a9dcc2a82.squirrel@fuckaround.org>
On 7/17/2011 3:12 AM, Pol Hallen wrote:
> hello and thanks for the reply :-)
>
> dd if=/dev/zero of=test bs=4096 count=262144
> 262144+0 records in
> 262144+0 records out
> 1073741824 bytes (1.1 GB) copied, 31.3475 s, 34.3 MB/s
>
> I've 8Gb ddr3 of ram
Then you have multiple problems causing poor performance. Now is the
time for you to post your hardware configuration, drive model
number(s), mdadm config, and filesystem. You should have done all of
this in your initial post.
You've been on this list long enough to have known of the WD Green
sector alignment issue and avoided it, and to know better than to run
performance tests while an array is still in its initial sync. Thus I
initially assumed your problem was merely the insane dd block size.
--
Stan
next prev parent reply other threads:[~2011-07-17 23:03 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-16 19:40 standard performance (write speed 20Mb/s) Pol Hallen
2011-07-17 4:26 ` Stan Hoeppner
2011-07-17 8:12 ` Pol Hallen
2011-07-17 12:11 ` John Robinson
2011-07-17 12:22 ` Iustin Pop
2011-07-17 12:51 ` John Robinson
2011-07-17 13:28 ` Iustin Pop
2011-07-18 9:04 ` John Robinson
2011-07-17 22:05 ` Stan Hoeppner
2011-07-27 5:42 ` Simon Matthews
2011-07-27 5:46 ` Roman Mamedov
2011-07-27 10:22 ` Stan Hoeppner
2011-07-27 10:26 ` John Robinson
2011-07-27 12:35 ` Joe Landman
2011-07-27 13:54 ` Stan Hoeppner
2011-07-17 23:03 ` Stan Hoeppner [this message]
2011-07-18 11:52 ` Pol Hallen
2011-07-21 17:07 ` standard performance (write speed ??Mb/s) - new raid5 array Pol Hallen
2011-07-22 0:05 ` Stan Hoeppner
2011-07-22 7:08 ` Pol Hallen
2011-07-22 8:13 ` Erwan Leroux
2011-07-17 16:48 ` standard performance (write speed 20Mb/s) Gordon Henderson
-- strict thread matches above, loose matches on Subject: below --
2011-07-18 12:03 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
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