On 19/2/24 10:26, Keith Bainbridge wrote:
On 18/2/24 14:49, Keith Bainbridge wrote:
On 18/2/24 07:34, debian-user@howorth.org.uk wrote:
Keith Bainbridge <keithrbau@gmail.com> wrote:
Yes the / partitions are btrfs
So the apparently missing space is perhaps taken up by btrfs snapshots.
Seems to be the prime suspect.   If that's the case, btrfs is NOT 
hard- linking the snapshots as timeshift claims it does. The only way 
to check is install on ext4 and compare. I have saves enough free 
space to do this.
My effort to date is to move my home to /mnt/data and sim-link it 
into / home. df is now showing 2.3GB free on /.  df showed /home as 
2.2GB yesterday.  At least there is a little space to play with; and 
give me time to consider. A fresh install may be worth checking in 
snapshots are as big as this all makes them look.
a few brief answer to other comments will follow
So later yesterday afternoon I created a new snapshot with no obvious 
change is free space.
I then update/upgrade.   The initial attempt told me
63 upgraded, 3 newly installed, 0 to remove and 0 not upgraded.
Need to get 337 MB of archives.
After this operation, 473 MB of additional disk space will be used.
Do you want to continue? [Y/n]
But the 3 kernel related packages failed to install a couple of times. 
When I finally figured I should check space, there was none.   I 
rolled back to prior to the upgrade, but still no free space.
I said sometime in this thread that timeshift (and BiT) use hard links 
to create progressive copies of the system. The more I think about how 
hard links reportedly work, I reckon it can't be simply hard links.
So I'm starting a new thread on that topic.
So I'm back to see some more helpful hints. Thanks folk
I am convinced that the missing space is used by btrfs snapshot process. 
But WHY is the used space reporting on my daily driver LESS than that on 
the spare machine  29G vs 35G? The original install was the same .iso 
  Ah well
I could add some of the spare space the the / partition, but how much? 
Play safe and use the lot, making it 60G compared to 63G on my daily 
driver. (And create some free space off the data partition before it's 
too late.)
Just as well I have time on my hands
Again, thanks to all for your suggestions