On Fri, 12 Sep 2014 00:05:08 +0200 Marco Schindler <marco.schindler@xxxxxxxxx> wrote: > Hello, > > Im seeing frequent disk activity on all raid drives from mdadm since upgrading to 3.3.1/3.3.2 from 3.2. > It keeps drives from sleeping (disk access every ~15 minutes). Is it intentional? No. > > I reported a similar issue for udev a few weeks ago: https://bugs.gentoo.org/show_bug.cgi?id=518748 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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