Re: frequent disk activity with mdadm-3.3

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On 12.09.2014, at 00:24, NeilBrown <neilb@xxxxxxx> wrote:

> On Fri, 12 Sep 2014 00:05:08 +0200 Marco Schindler
> <marco.schindler@xxxxxxxxx> wrote:
> 
> In that bug report you mention upgraded udev.  Here you mention upgrading
> mdadm.... a bit confusing.

totally unsure if this is related, it may be coincidence. 
just found it’s odd to have a similar issue with two different processes in such a short timeframe.

I have blocked >sys-fs/udev-212 and >sys-fs/mdadm-3.2 for now to give drives some rest.

> 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

yes I have (and have been) running "mdadm --monitor --scan —daemonise"
I have /proc/sys/vm/block_dump enabled and it shows process mdadm acessing drives every 15 minutes.

I wouldn’t be aware of mdadm being invoked elsewhere, so I presume it won’t happen when daemon is not running.
Will see if I can get some more info with blktrace and report back..



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