From mboxrd@z Thu Jan  1 00:00:00 1970
From: NeilBrown <neilb@suse.de>
Subject: Re: frequent disk activity with mdadm-3.3
Date: Fri, 12 Sep 2014 08:24:03 +1000
Message-ID: <20140912082403.549fc298@notabene.brown>
References: <AB305DF4-9DCC-47E1-9B29-130E211D4B4E@gmail.com>
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To: Marco Schindler <marco.schindler@gmail.com>
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On Fri, 12 Sep 2014 00:05:08 +0200 Marco Schindler
<marco.schindler@gmail.com> wrote:

> Hello,
>=20
> Im seeing frequent disk activity on all raid drives from mdadm since upgr=
ading to 3.3.1/3.3.2 from 3.2.
> It keeps drives from sleeping (disk access every ~15 minutes). Is it inte=
ntional?

No.

>=20
> I reported a similar issue for udev a few weeks ago: https://bugs.gentoo.=
org/show_bug.cgi?id=3D518748

In that bug report you mention upgraded udev.  Here you mention upgrading
mdadm.... a bit confusing.

Can you use "blktrace" to gather details on exactly what is being read and
when, and  hopefully which process is doing it?

Is "mdadm --monitor" (or "-F") running?  If you kill it does the disk
activity go away?

NeilBrown

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