From: John Robinson <john.robinson@anonymous.org.uk>
To: Stan Hoeppner <stan@hardwarefreak.com>
Cc: Simon Matthews <simon.d.matthews@gmail.com>,
Pol Hallen <raid1@fuckaround.org>,
linux-raid@vger.kernel.org
Subject: Re: standard performance (write speed 20Mb/s)
Date: Wed, 27 Jul 2011 11:26:39 +0100 [thread overview]
Message-ID: <4E2FE7DF.1020906@anonymous.org.uk> (raw)
In-Reply-To: <4E2FE6C9.4070604@hardwarefreak.com>
On 27/07/2011 11:22, Stan Hoeppner wrote:
> On 7/27/2011 12:42 AM, Simon Matthews wrote:
>> On Sun, Jul 17, 2011 at 5:11 AM, John Robinson
>> <john.robinson@anonymous.org.uk> wrote:
>>
>>> Pretty poor. CentOS 5, Intel ICH10, md RAID 6 over 5 7200rpm 1TB drives,
>>> then LVM, then ext3:
>>> # dd if=/dev/zero of=test bs=4096 count=262144
>>> 262144+0 records in
>>> 262144+0 records out
>>> 1073741824 bytes (1.1 GB) copied, 2.5253 seconds, 425 MB/s
>>
>> What hard drive offers a sustained data rate of 425 MB/s or even half that?
>
> 425 MB/s / 3 spindles = 142 MB/s per spindle
>
> That's not poor, it's excellent. Which drives are these? WD Black,
> Seagate, Hitachi?
Gentlemen, we've been round this loop before about 10 days ago. Pol's 20
MB/s was poor because he was testing on an array with unaligned
partitions and a resync was running, my 425 MB/s was a bad test because
it didn't use fdatasync or direct and I said dd was a bad test anyway,
etc etc.
Cheers,
John.
next prev parent reply other threads:[~2011-07-27 10:26 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 [this message]
2011-07-27 12:35 ` Joe Landman
2011-07-27 13:54 ` Stan Hoeppner
2011-07-17 23:03 ` Stan Hoeppner
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
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=4E2FE7DF.1020906@anonymous.org.uk \
--to=john.robinson@anonymous.org.uk \
--cc=linux-raid@vger.kernel.org \
--cc=raid1@fuckaround.org \
--cc=simon.d.matthews@gmail.com \
--cc=stan@hardwarefreak.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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.