Thank you all for the very helpful advice:-

If I understand you all the problems are ZFS is choking because I don't
have enough disk space. The reason I don't have enough disk space is
because the files I deleted are still in the old snapshots, plus it was
already pretty full.

This seems like a good way forward but is it really and if so how do I do
it?
First things first ZFS is choking due to lack of disk space. However, I
have a lot of totally unused diskspace on a windows partition so how can I
reduce the windows partition and increase the ZFS to stop it choking. It
has 560GB of which I do not need more than 200max to leave for Windoze.

Gparted apparently doesn't like ZFS but does this matter? I can I assume
use it to shrink the Windows partition and free up about 360GB, then how do
I expand the ZFS to use that free space?
Second, I have checked /etc/cron and find auto snap shot commands for
hourly, daily, weekly & monthly
hourly = 24, daily = 31, weekly = 8, monthly = 6. It seems I could change
that to hourly = 24, daily = 7, weekly = 4, monthly = 6 and get pretty much
the same coverage with a lot less snapshots.

Listing snapshots shows some from 2019, where are they coming from as with
monthly only storing 6 months there shouldn't be anything newer than
February 2020 or am I not understanding something here?

The computer is a Lenovo W541 laptop, the longer term plan is to double the
memory to 32GB and put a 2TB SSD in this box. Does that sound sensible?

In the meantime, a thorough backup is running in at least two external
drives (one incremental and one fresh).

Stripes.

On Sun, 23 Aug 2020 at 06:55, Keith Bainbridge <[email protected]>
wrote:

>
> On 23/8/20 10:25 am, Darren Wurf wrote:
> > I noticed the snapshots follow a grandparent-parent-child pattern,
> > something is managing these snapshots for you - which would explain why
> > you have no older ones as well as why there are many recent snapshots
> > and few older ones.
>
> And if that is the case, that manager may be using hard links to reduce
> the space being used.  So deleting older snapshots may not have a big
> affect.
>
> I know timeshift works that way - the grandparent-parent-child pattern
> and hard links.
>
> --
> Keith Bainbridge
>
> [email protected]
> or [email protected]
>
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> .
>


-- 
Stripes Theotoky

-37 .713869
145.050562
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