From: Dennis Kaarsemaker <dennis.kaarsemaker@booking.com>
To: stan@hardwarefreak.com
Cc: xfs@oss.sgi.com
Subject: Re: XFS IO multiplication problem on centos/rhel 6 using hp p420i raid controllers
Date: Thu, 07 Mar 2013 14:52:56 +0100 [thread overview]
Message-ID: <1362664376.16657.26.camel@seahawk> (raw)
In-Reply-To: <513899D3.80907@hardwarefreak.com>
On Thu, 2013-03-07 at 07:44 -0600, Stan Hoeppner wrote:
> On 3/7/2013 7:33 AM, Dennis Kaarsemaker wrote:
>
> > The "ten times as many bytes" is constant, so it is constantly writing
> > ten times as much data.
>
> Where in the IO stack are you counting the bytes? Are 10x as many bytes
> actually hitting the AGs? I.e. are you consuming 10x more (real--not
> counting preallocation) space in the filesystem? Or are you simply
> seeing larger IOs in flight per unit time, but the same total amount of
> IO bytes?
I'm counting them with vmstat, iostat and collectl as can be seen in the
various outputs I've sent. I hope that answers your question as I have
no idea how to see what's hitting the AG's.
I am not using ten times as much space, as that wouldn't fit on the
volume.
--
Dennis Kaarsemaker, Systems Architect
Booking.com
Herengracht 597, 1017 CE Amsterdam
Tel external +31 (0) 20 715 3409
Tel internal (7207) 3409
_______________________________________________
xfs mailing list
xfs@oss.sgi.com
http://oss.sgi.com/mailman/listinfo/xfs
next prev parent reply other threads:[~2013-03-07 13:52 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-02-28 14:12 XFS IO multiplication problem on centos/rhel 6 using hp p420i raid controllers Dennis Kaarsemaker
2013-02-28 15:34 ` Stan Hoeppner
2013-02-28 19:40 ` Dave Chinner
2013-03-06 13:53 ` Dennis Kaarsemaker
2013-03-07 3:57 ` Dave Chinner
2013-03-07 10:12 ` Dennis Kaarsemaker
2013-03-07 13:10 ` Stan Hoeppner
2013-03-07 13:33 ` Dennis Kaarsemaker
2013-03-07 13:44 ` Stan Hoeppner
2013-03-07 13:52 ` Dennis Kaarsemaker [this message]
2013-03-07 23:00 ` Dave Chinner
2013-03-08 9:09 ` Dennis Kaarsemaker
2013-03-08 11:49 ` Dennis Kaarsemaker
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=1362664376.16657.26.camel@seahawk \
--to=dennis.kaarsemaker@booking.com \
--cc=stan@hardwarefreak.com \
--cc=xfs@oss.sgi.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.