From: Stan Hoeppner <stan@hardwarefreak.com>
To: lilofile <lilofile@aliyun.com>, Linux RAID <linux-raid@vger.kernel.org>
Subject: Re: 答复：答复：md raid5 performace 6x SSD RAID5
Date: Thu, 28 Nov 2013 20:38:20 -0600 [thread overview]
Message-ID: <5297FE1C.6080504@hardwarefreak.com> (raw)
In-Reply-To: <fa7f0ec0-e7ba-46ca-a129-24bb45b52460@aliyun.com>
On 11/28/2013 4:02 AM, lilofile wrote:
> thank you for your advise. now I have test multi-thread patch, the single raid5 performance improve 30%.
>
> but I have another problem,when write on single raid,write performance is approx 1.1GB/s
...
> [1]- Done dd if=/dev/zero of=/dev/md126 count=100000 bs=1M
> [2]+ Done dd if=/dev/zero of=/dev/md127 count=100000 bs=1M
No. This is not a parallel IO test.
...
> To address #3 use FIO or a similar testing tool that can issue IOs in
> parallel. With SSD based storage you will never reach maximum
> throughput with a serial data stream.
This is a parallel IO test, one command line:
~# fio --directory=/dev/md126 --zero_buffers --numjobs=16
--group_reporting --blocksize=64k --ioengine=libaio --iodepth=16
--direct=1 --size=64g --name=read --rw=read --stonewall --name=write
--rw=write --stonewall
Normally this targets a filesystem, not a raw block device. This
command line should work for a raw md device.
--
Stan
next prev parent reply other threads:[~2013-11-29 2:38 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-11-22 11:13 ARC-1120 and MD very sloooow Jimmy Thrasibule
2013-11-22 11:17 ` Mikael Abrahamsson
2013-11-22 20:17 ` Stan Hoeppner
2013-11-22 20:17 ` Stan Hoeppner
2013-11-25 8:56 ` Jimmy Thrasibule
2013-11-26 0:45 ` Stan Hoeppner
2013-11-26 0:45 ` Stan Hoeppner
2013-11-26 2:52 ` Dave Chinner
2013-11-26 2:52 ` Dave Chinner
2013-11-26 3:58 ` Stan Hoeppner
2013-11-26 3:58 ` Stan Hoeppner
2013-11-26 6:14 ` Dave Chinner
2013-11-26 8:03 ` Stan Hoeppner
2013-11-26 8:03 ` Stan Hoeppner
2013-11-28 15:59 ` Jimmy Thrasibule
2013-11-28 15:59 ` Jimmy Thrasibule
2013-11-28 19:59 ` Stan Hoeppner
2013-11-27 13:48 ` md raid5 performace 6x SSD RAID5 lilofile
2013-11-27 13:51 ` 答复：md " lilofile
2013-11-28 4:41 ` Stan Hoeppner
2013-11-28 4:46 ` Roman Mamedov
2013-11-28 6:24 ` Stan Hoeppner
2013-11-28 10:02 ` 答复：答复：md " lilofile
2013-11-29 2:38 ` Stan Hoeppner [this message]
2013-11-29 6:23 ` Stan Hoeppner
2013-11-30 14:12 ` 答复：答复：答复：md raid5 random " lilofile
2013-12-01 14:14 ` Stan Hoeppner
2013-12-01 16:33 ` md " lilofile
2013-12-02 2:37 ` Stan Hoeppner
2013-11-28 11:54 ` 答复：答复：md raid5 " lilofile
2013-12-02 3:48 ` md " lilofile
2013-12-02 5:51 ` Stan Hoeppner
2014-09-23 3:34 ` raid sync speed lilofile
2014-09-23 5:11 ` behind_writes lilofile
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=5297FE1C.6080504@hardwarefreak.com \
--to=stan@hardwarefreak.com \
--cc=lilofile@aliyun.com \
--cc=linux-raid@vger.kernel.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 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.