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Strange statistics from gparted

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  Strange statistics from gparted Richard Owlett <rowlett@cloud85.net> - 2021-02-07 19:50 +0100
    Re: Strange statistics from gparted Andrei POPESCU <andreimpopescu@gmail.com> - 2021-02-08 09:20 +0100
      Re: Strange statistics from gparted "Thomas Schmitt" <scdbackup@gmx.net> - 2021-02-08 10:20 +0100
        Re: Strange statistics from gparted David Wright <deblis@lionunicorn.co.uk> - 2021-02-08 16:10 +0100
      Re: Strange statistics from gparted Richard Owlett <rowlett@cloud85.net> - 2021-02-08 12:10 +0100
        Re: Strange statistics from gparted David <bouncingcats@gmail.com> - 2021-02-08 13:30 +0100
    Re: Strange statistics from gparted "Andrew M.A. Cater" <amacater@einval.com> - 2021-02-08 10:30 +0100
      Re: Strange statistics from gparted Richard Owlett <rowlett@cloud85.net> - 2021-02-08 13:10 +0100
    Re: Strange statistics from gparted Richard Owlett <rowlett@cloud85.net> - 2021-02-10 11:40 +0100
      Re: Strange statistics from gparted David <bouncingcats@gmail.com> - 2021-02-10 12:30 +0100

#231473 — Strange statistics from gparted

I am experimenting with custom installs of MATE on Debian 10.7 .
My goal is to minimize its footprint on disk, and reduce menu clutter.
I have a default install with / on sda1.
The custom install has / on sda2.
Both installs use /sda3 for /home.

When running gparted from the first, it reports
   sda1 used space is 3.85 GB
   sda2 used space is 2.25 GB

When running gparted from the second, it reports
   sda1 used space is 4.77 GB
   sda2 used space is 1.80 GB

Why?
TIA ;}

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#231485

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On Du, 07 feb 21, 12:39:59, Richard Owlett wrote:
> I am experimenting with custom installs of MATE on Debian 10.7 .
> My goal is to minimize its footprint on disk, and reduce menu clutter.
> I have a default install with / on sda1.
> The custom install has / on sda2.
> Both installs use /sda3 for /home.
> 
> When running gparted from the first, it reports
>   sda1 used space is 3.85 GB
>   sda2 used space is 2.25 GB
> 
> When running gparted from the second, it reports
>   sda1 used space is 4.77 GB
>   sda2 used space is 1.80 GB
> 
> Why?
> TIA ;}

Based on the limited information available my best guess is that you are 
looking at different disk drives as the device names can change between 
boots.

In any case, try comparing the outputs of 'parted -l' (needs root) and 
'lsblk -f'. If you still see a discrepancy please paste the full output 
of both commands.


Kind regards,
Andrei
-- 
http://wiki.debian.org/FAQsFromDebianUser

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#231488

Hi,

Richard Owlett wrote:
> > I am experimenting with custom installs of MATE on Debian 10.7 .
> > [...]
> > I have a default install with / on sda1.
> > The custom install has / on sda2.
> > [...]
> > When running gparted from the first, it reports
> >   sda1 used space is 3.85 GB
> >   sda2 used space is 2.25 GB
> > When running gparted from the second, it reports
> >   sda1 used space is 4.77 GB
> >   sda2 used space is 1.80 GB

Andrei POPESCU wrote:
> Based on the limited information available my best guess is that you are
> looking at different disk drives as the device names can change between
> boots.

If this turns out to be not the case:

- Can it be that MATE stores a large amount of data when it gets shut down
  and deletes the files after a new startup ?
  (The respective active /-filesystem's usage seems to be smaller than
   the inactive /-filesystem.)

- What does "du -s" tell about the mounted filesystems in both situations ?


Have a nice day :)

Thomas

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#231517

On Mon 08 Feb 2021 at 10:15:22 (+0100), Thomas Schmitt wrote:
> Richard Owlett wrote:
> > > I am experimenting with custom installs of MATE on Debian 10.7 .
> > > [...]
> > > I have a default install with / on sda1.
> > > The custom install has / on sda2.
> > > [...]
> > > When running gparted from the first, it reports
> > >   sda1 used space is 3.85 GB
> > >   sda2 used space is 2.25 GB
> > > When running gparted from the second, it reports
> > >   sda1 used space is 4.77 GB
> > >   sda2 used space is 1.80 GB
> 
> Andrei POPESCU wrote:
> > Based on the limited information available my best guess is that you are
> > looking at different disk drives as the device names can change between
> > boots.
> 
> If this turns out to be not the case:
> 
> - Can it be that MATE stores a large amount of data when it gets shut down
>   and deletes the files after a new startup ?
>   (The respective active /-filesystem's usage seems to be smaller than
>    the inactive /-filesystem.)

Well, the most obvious one is /tmp, assuming that it's "real".
Booting up will normally clean this. (On occasions, I have had
to boot up the other system on my disk to recover files I had
accidentally left there.)

> - What does "du -s" tell about the mounted filesystems in both situations ?

Particularly after having mounted any other filesystems on the disk.

Cheers,
David.

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#231496

On 02/08/2021 02:15 AM, Andrei POPESCU wrote:
> On Du, 07 feb 21, 12:39:59, Richard Owlett wrote:
>> I am experimenting with custom installs of MATE on Debian 10.7 .
>> My goal is to minimize its footprint on disk, and reduce menu clutter.
>> I have a default install with / on sda1.
>> The custom install has / on sda2.
>> Both installs use /sda3 for /home.
>>
>> When running gparted from the first, it reports
>>    sda1 used space is 3.85 GB
>>    sda2 used space is 2.25 GB
>>
>> When running gparted from the second, it reports
>>    sda1 used space is 4.77 GB
>>    sda2 used space is 1.80 GB
>>
>> Why?
>> TIA ;}
> 
> Based on the limited information available my best guess is that you are
> looking at different disk drives as the device names can change between
> boots.

No. The laptop has only a single hard disk.
Also, the two installations were performed from the same USB flash 
drive. Both installs were configured to allow booting to either "root" 
or "user".

> 
> In any case, try comparing the outputs of 'parted -l' (needs root)

In both cases the result is:
> Model: ATA SanDisk SDSSDA24 (scsi)
> Disk /dev/sda: 240GB
> Sector size (logical/physical): 512B/512B
> Partition Table: msdos
> Disk Flags: 
> 
> Number  Start   End     Size    Type      File system     Flags
>  1      1049kB  8000MB  7999MB  primary   ext4            boot
>  2      8000MB  40.0GB  32.0GB  primary   ext4
>  3      40.0GB  124GB   84.3GB  primary   ext4
>  4      124GB   240GB   116GB   extended
>  6      124GB   132GB   7999MB  logical   ext4
>  7      132GB   140GB   7999MB  logical   ext4
>  5      232GB   240GB   8000MB  logical   linux-swap(v1)

> and
> 'lsblk -f'. If you still see a discrepancy please paste the full output
> of both commands.

Difficult to compare as lsblk reports usage ONLY for mounted partitions 
while gparted reports values for mounted AND unmounted partitions.

Cut-n-paste from both runs:

> root@debian10-7-full:~# lsblk -f
> NAME   FSTYPE LABEL       UUID                                 FSAVAIL FSUSE% MOUNTPOINT
> sda                                                                           
> ├─sda1 ext4   debian-full f79f1db4-beb4-404b-85ae-18f8c037a424    3.2G    51% /
> ├─sda2 ext4   home-all    7f20c788-c8ed-4a55-9571-9f528ac33909   27.7G     0% /home
> ├─sda3 ext4   dvds        b4e307a5-daaa-4c96-a13d-2efc211251de    5.6G    88% /dvds
> ├─sda4                                                                        
> ├─sda5 swap               6b892dcd-12af-4774-88c0-c53cd066cae3                [SWAP]
> ├─sda6 ext4   debian-min  fbd14c22-6ee7-4832-a22b-cdb8d7978abd                
> └─sda7 ext4   test-debian f23e8435-81b0-4b9d-bdba-d4d60f15052d                
> sr0                                                                           
> root@debian10-7-full:~# 


> root@debian-min:~# lsblk -f
> NAME   FSTYPE LABEL       UUID                                 FSAVAIL FSUSE% MOUNTPOINT
> sda                                                                           
> ├─sda1 ext4   debian-full f79f1db4-beb4-404b-85ae-18f8c037a424                
> ├─sda2 ext4   home-all    7f20c788-c8ed-4a55-9571-9f528ac33909   27.7G     0% /home
> ├─sda3 ext4   dvds        b4e307a5-daaa-4c96-a13d-2efc211251de    5.6G    88% /dvds
> ├─sda4                                                                        
> ├─sda5 swap               6b892dcd-12af-4774-88c0-c53cd066cae3                [SWAP]
> ├─sda6 ext4   debian-min  fbd14c22-6ee7-4832-a22b-cdb8d7978abd    5.3G    22% /
> └─sda7 ext4   test-debian f23e8435-81b0-4b9d-bdba-d4d60f15052d                
> sr0                                                                           
> root@debian-min:~# 

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#231504

On Mon, 8 Feb 2021 at 22:09, Richard Owlett <rowlett@cloud85.net> wrote:

> Difficult to compare as lsblk reports usage ONLY for mounted partitions
> while gparted reports values for mounted AND unmounted partitions.

The easiest solution will be to mount the partitions of interest
somewhere before examining them with the appropriate tools.

If you are interested in how gparted works, perhaps you might
review your previous question on this topic:
   https://lists.debian.org/debian-user/2019/01/msg00910.html

In particular:
   https://lists.debian.org/debian-user/2019/01/msg01106.html
   https://lists.debian.org/debian-user/2019/01/msg01112.html
shows that gparted was using dumpe2fs.

You can run that tool yourself. Maybe something like:
# dumpe2fs -h /dev/sda1 | grep ^Free

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#231489

On Sun, Feb 07, 2021 at 12:39:59PM -0600, Richard Owlett wrote:
> I am experimenting with custom installs of MATE on Debian 10.7 .
> My goal is to minimize its footprint on disk, and reduce menu clutter.
> I have a default install with / on sda1.
> The custom install has / on sda2.
> Both installs use /sda3 for /home.
> 
> When running gparted from the first, it reports
>   sda1 used space is 3.85 GB
>   sda2 used space is 2.25 GB
> 
> When running gparted from the second, it reports
>   sda1 used space is 4.77 GB
>   sda2 used space is 1.80 GB
> 
> Why?
> TIA ;}

You may not have kept up with recent installers: the default size of swap 
is now smaller since it's almost never used.

Did you install both exactly the same way using the same media?

Andy Cater
> 
> 
> 

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#231503

On 02/07/2021 01:15 PM, Andrew M.A. Cater wrote:
> On Sun, Feb 07, 2021 at 12:39:59PM -0600, Richard Owlett wrote:
>> I am experimenting with custom installs of MATE on Debian 10.7 .
>> My goal is to minimize its footprint on disk, and reduce menu clutter.
>> I have a default install with / on sda1.
>> The custom install has / on sda2.
>> Both installs use /sda3 for /home.
>>
>> When running gparted from the first, it reports
>>    sda1 used space is 3.85 GB
>>    sda2 used space is 2.25 GB
>>
>> When running gparted from the second, it reports
>>    sda1 used space is 4.77 GB
>>    sda2 used space is 1.80 GB
>>
>> Why?
>> TIA ;}
> 
> You may not have kept up with recent installers: the default size of swap
> is now smaller since it's almost never used.
> 
> Did you install both exactly the same way using the same media?
> 
> Andy Cater

I created a swap partition during the install of the first system.

During the install of the second system I told the partitioning phase to 
NOT use the existing swap partition.
I then copied the "swap line" from the /etc/fstab of the first install 
to the  /etc/fstab of the second install.

Thus both installs are using the same physical partition for swap.

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#231579

On 02/07/2021 12:39 PM, Richard Owlett wrote:
> I am experimenting with custom installs of MATE on Debian 10.7 .
> My goal is to minimize its footprint on disk, and reduce menu clutter.
> I have a default install with / on sda1.
> The custom install has / on sda2.
> Both installs use /sda3 for /home.
> 
> When running gparted from the first, it reports
>    sda1 used space is 3.85 GB
>    sda2 used space is 2.25 GB
> 
> When running gparted from the second, it reports
>    sda1 used space is 4.77 GB
>    sda2 used space is 1.80 GB
> 
> Why?

The short answer is that gparted uses dumpe2fs which requires partition 
to be mounted {perhaps read only}.

Elsewhere in this thread David pointed me to an old thread with a 
discussion of gparted.


   [https://lists.debian.org/debian-user/2019/01/msg00910.html]

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#231581

On Wed, 10 Feb 2021 at 21:35, Richard Owlett <rowlett@cloud85.net> wrote:
> On 02/07/2021 12:39 PM, Richard Owlett wrote:

> > I am experimenting with custom installs of MATE on Debian 10.7 .
> > My goal is to minimize its footprint on disk, and reduce menu clutter.
> > I have a default install with / on sda1.
> > The custom install has / on sda2.
> > Both installs use /sda3 for /home.

> > When running gparted from the first, it reports
> >    sda1 used space is 3.85 GB
> >    sda2 used space is 2.25 GB

> > When running gparted from the second, it reports
> >    sda1 used space is 4.77 GB
> >    sda2 used space is 1.80 GB

> > Why?

> The short answer is that gparted uses dumpe2fs which requires partition
> to be mounted {perhaps read only}.

That's untrue. Demo:

root@kablamm:~# umount -v /dev/sdb1
umount: /dev/sdb1: not mounted.
root@kablamm:~# dumpe2fs -h /dev/sdb1 | grep ^Free
dumpe2fs 1.44.5 (15-Dec-2018)
Free blocks:              2721787
Free inodes:              792525

It seems too that you missed the point that gparted apparently
uses dumpe2fs to examine *unmounted* partitions.

It is also puzzling why you don't just mount any partition (that
you are curious about) somewhere and run 'df'?

Are you aware that you can easily access partitions that aren't
mounted automatically? Just mount them yourself, using the
'mount' command.

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