On Fri, 15 May 2020 at 18:41, Patrick O'Callaghan <pocallaghan@gmail.com> wrote:

On Fri, 2020-05-15 at 22:35 +0100, Patrick O'Callaghan wrote:
> > echo check > /sys/block/md127/md/sync_action

That's giving "permission denied" even with sudo, and with setenforce
set to 'off'.

This can happend if you run :

$ sudo echo check > /sys/block/md127/md/sync_action

which fails because redirection is done by the shell before the

sudo command runs. Use:

$ sudo bash -c "echo check > /sys/block/md127/md/sync_action"

George N. White III