On Mon, 27 Jul 2015 at 12:40 Marcus Furlong <furlongm@gmail.com> wrote:

I didn't work yet out what umounts it exactly. But to see if it
mounted I did something like the following:

for i in `seq 1 100` ; do mount /dev/sdb1 ; mount | grep sdb1 ; done

and on some iterations it would be mounted, but umounted on subsequent
iterations.

I was going to try debugging this further this cold morning, but it seems it is working perfectly.

I believe that the default x-systemd.timeout is 90 seconds. Should be more then enough I think. mount -a works much faster.