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From: Andy Sautins <andy.sautins@returnpath.net>
To: "common-user@hadoop.apache.org" <common-user@hadoop.apache.org>
Date: Thu, 10 Dec 2009 17:55:48 -0700
Subject: What do you use for capturing Disk I/O?
Thread-Topic: What do you use for capturing Disk I/O?
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    I have a question that I got an interesting and helpful answer for on t=
he IRC channel today, but thought I'd open it up to a larger group as well.

   My problem is hopefully a very common problem.  I'm using Ganglia for tr=
end graphing.  We are using Ganglia 3.0.7 for convenience since RPMS are av=
ailable for CentOS 5.4 through EPEL.  Everything generally works great, but=
 Ganglia doesn't appear to gather Disk I/O stats ( writes/sec, reads/sec, e=
tc ) as a metric.  Some quick looking on the web seemed to confirm that gan=
glia doesn't capture disk I/O stats by default, but talk about how it's gen=
erally pretty easy to capture using gmetric.

   I guess my question would be is there a common way of doing this?  What =
do you use?  Do you find Disk I/O to be a useful/necessary metric?

   Any thoughts would be much appreciated.


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