All of lore.kernel.org
 help / color / mirror / Atom feed
From: Michael Tokarev <mjt@tls.msk.ru>
To: Nix <nix@esperi.org.uk>
Cc: Linux RAID <linux-raid@vger.kernel.org>
Subject: Re: below 10MB/s write on raid5
Date: Thu, 14 Jun 2007 13:15:06 +0400	[thread overview]
Message-ID: <4671071A.8050901@msgid.tls.msk.ru> (raw)
In-Reply-To: <87ir9r2ywf.fsf@hades.wkstn.nix>

Nix wrote:
[]
> With iflag=direct I get, um,
> 
> loki:/var/log# time dd if=/dev/md1 bs=1000 count=502400 of=/dev/null iflag=direct
> dd: reading `/dev/md1': Invalid argument

For direct i/o, you have to use blocksize =512, 1024, ... - multiple of a sector size.

/mjt

  reply	other threads:[~2007-06-14  9:15 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-06-11 12:46 below 10MB/s write on raid5 Dexter Filmore
2007-06-11 12:47 ` Justin Piszcz
2007-06-11 13:28   ` Dexter Filmore
2007-06-11 13:29     ` Justin Piszcz
2007-06-11 13:45       ` Jon Nelson
2007-06-11 13:53         ` Justin Piszcz
2007-06-11 14:06       ` Dexter Filmore
2007-06-11 14:07         ` Justin Piszcz
2007-06-11 22:24       ` Nix
2007-06-12  2:35         ` Jon Nelson
2007-06-13 23:54           ` Nix
2007-06-14  9:15             ` Michael Tokarev [this message]
2007-06-13 23:55           ` Nix
2007-06-12 17:16 ` Bill Davidsen
2007-06-12 17:14   ` Justin Piszcz

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=4671071A.8050901@msgid.tls.msk.ru \
    --to=mjt@tls.msk.ru \
    --cc=linux-raid@vger.kernel.org \
    --cc=nix@esperi.org.uk \
    /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.