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
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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
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