[lug] Mystery Disk Use, Fedora 23

Steve Sullivan steve.sullivan at mathcom.com
Fri Sep 23 21:18:50 MDT 2016

Have you tried iotop?

On Sat, Sep 24, 2016 at 03:06:02AM +0000, stimits at comcast.net wrote:
> Hi,
> I was planning on trying to make a RAID1 setup and then cover it with LVM, but
> I only got as far as creating the RAID1 setup (it isn't mounted, but I can
> verify I can format it or mount it, so on). Before I created the RAID1 on two
> new disks there was nothing strange. After I created this, I can see constant
> hard drive activity, it never ends. It isn't updatedb, it isn't fsck. I don't
> know how to remove my "/dev/md0" now that I've created it, but I know I can't
> leave this constant hard drive access churning away, it worries me (and I don't
> know which drive it is...I have many).
> Is there something like top, but for watching disk I/O? I see nothing using
> significant CPU, and I've tried fuser on any partition's device special file
> which is not supposed to be mounted, and see nothing. What is a good tool to
> find out what's is consuming disk activity? What is a good way to remove a
> RAID1 device (there is no "/etc/mdadm.conf" and "/dev/md0" persists across
> boots).
> Also, I rarely use GUI tools, but I haven't worked with setting up RAID and LVM
> in a very long time. I see references to "system-config-lvm", but apparently
> this is no longer available in Fedora 23. Is there some other recommended tool?
> Any suggestions on removing "/dev/md0" other than yanking the drive cables
> while powered down?
> Thanks!

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Steve Sullivan      steve.sullivan at mathcom.com
720-587-7498        http://www.mathcom.com

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