On 2020-06-02 11:57, Patrick O'Callaghan wrote:
I have a powered USB dock with a couple of SATA drives configured as
RAID1, and used only for nightly backups. The (minimal) manual for the
dock tells me it will power down after 30 minutes idle time, however I
don't see this happening. I presume that something (such as the md
system) is touching the drives periodically.

First:

  dnf install blktrace

then start a (replace sda with one of the disks)

  btrace /dev/sda

and keep it running when no activity is expected.
It will tell you what is touching the drive, including any RAID
reconstruction or check.

You could also run the command on /dev/md0 (or what is named),
to see if something is accessing the RAID through the filesytem
(e.g. df, updatedb, ...).

Regards.

--
   Roberto Ragusa    mail at robertoragusa.it
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