He! He! He!
I've installed the shutdown diagnostic and on reboot there is no delay on shutdown!
Unfortunately, ftrace was not installed, so I couldn't analyse what was not happening.
I removed the diagnostic and the shutdown delay returned.
So it seems that the more you search for something, the more it goes away.
I am out of my depth now, so I'll leave this issue as an exercise for the brave.

Cheers
Bill
 
-----Original message-----
> From:Bill Maidment <[log in to unmask]>
> Sent: Saturday 21st January 2017 7:48
> To: David Sommerseth <[log in to unmask]>; [log in to unmask]
> Subject: RE: SL7.3RC2 shutdown slow
> 
> David
> Thanks for the info. However, this only deals with booting. My issue is with shutdown.
> Your other email points to a shutdown diagnostic, so I'll try that, but I'm a bit wary of that not being a stable process.
>  
>  
> -----Original message-----
> > From:David Sommerseth <[log in to unmask]>
> > Sent: Saturday 21st January 2017 2:11
> > To: Bill Maidment <[log in to unmask]>; [log in to unmask]
> > Subject: Re: SL7.3RC2 shutdown slow
> > 
> > On 20/01/17 09:11, Bill Maidment wrote:
> > > Update.....
> > > 
> > > After shutting down several times everything seems to have settled
> > > down and there is no delay. Maybe I'm too impatient. Or something
> > > needed time to stabilize.
> > 
> > When you experience such issues, systemd does have a good way to help
> > point fingers at why the boot process lags ...
> > 
> >   # systemd-analyze blame
> > 
> > Replace 'blame' with 'plot', and you'll get an SVG file with a graphical
> > presentation of the boot process, in which order unit files started,
> > when they started and how much time each of them needed.  Or use 'dot'
> > to get a similar view in the dot(1) format.
> > 
> > 
> > -- 
> > kind regards,
> > 
> > David Sommerseth
> > 
> > 
> > > -----Original message-----
> > >> From:Bill Maidment <[log in to unmask]>
> > >> Sent: Friday 20th January 2017 17:58
> > >> To: [log in to unmask]
> > >> Subject: SL7.3RC2 shutdown slow
> > >>
> > >> Hi
> > >> I've created a new KVM guest using RC2 and no problems installing and updating from 7rolling, but rebooting is very slow.
> > >> I tried doing a shutdown and notice a 1min 30sec delay shutting down Dynamic System Tuning Daemon.
> > >> Is this expected behaviour on a new install?
> > >>
> > >> Cheers
> > >> Bill Maidment
> > >>
> > >>
> > 
> > 
> 
>