topic Re: Difference between show system disk usage and df -H in General Topics

Difference between show system disk usage and df -H

RemoteUser — Mon, 24 Feb 2025 11:27:22 GMT

Hi,

What is the difference between these two commands, and why is the output different?

show system disk usage
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg_splat-lv_current 32G 14G 19G 42% /
/dev/md0 291M 92M 185M 34% /boot
/dev/md3 60M 11M 50M 18% /boot/efi
/dev/mapper/vg_splat-lv_log 582G 8.3G 574G 2% /var/log
tmpfs 94G 891M 94G 1% /dev/shm

df -H
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg_splat-lv_current 35G 15G 21G 42% /
/dev/md0 305M 96M 194M 34% /boot
/dev/md3 63M 11M 52M 18% /boot/efi
/dev/mapper/vg_splat-lv_log 625G 8.9G 616G 2% /var/log
tmpfs 101G 934M 100G 1% /dev/shm

Re: Difference between show system disk usage and df -H

AkosBakos — Mon, 24 Feb 2025 12:02:39 GMT

Hi @RemoteUser

According to this sk: https://support.checkpoint.com/results/sk/sk144112

This command should be equivalent.

From my point of view, I always use df -h 🙂

Akos

Re: Difference between show system disk usage and df -H

AkosBakos — Mon, 24 Feb 2025 12:02:02 GMT

In my LAB the outputs are same if I use "-h" switch:

[Expert@mgmt-sakos-lab:0]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg_splat-lv_current 26G 20G 7.0G 74% /
/dev/sda2 291M 61M 215M 23% /boot
/dev/mapper/vg_splat-lv_log 20G 16G 5.0G 76% /var/log
tmpfs 7.8G 11M 7.8G 1% /dev/shm
cgroup 7.8G 0 7.8G 0% /sys/fs/cgroup

[Expert@mgmt-sakos-lab:0]# clish -c "show system disk usage"
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg_splat-lv_current 26G 20G 7.0G 74% /
/dev/sda2 291M 61M 215M 23% /boot
/dev/mapper/vg_splat-lv_log 20G 16G 5.0G 76% /var/log
tmpfs 7.8G 11M 7.8G 1% /dev/shm
cgroup 7.8G 0 7.8G 0% /sys/fs/cgroup

And the help said:

[Expert@mgmt-sakos-lab:0]# df --help
Usage: df [OPTION]... [FILE]...
Show information about the file system on which each FILE resides,
or all file systems by default.

Mandatory arguments to long options are mandatory for short options too.
-a, --all include dummy file systems
-B, --block-size=SIZE scale sizes by SIZE before printing them; e.g.,
'-BM' prints sizes in units of 1,048,576 bytes;
see SIZE format below
--direct show statistics for a file instead of mount point
--total produce a grand total
-h, --human-readable print sizes in human readable format (e.g., 1K 234M 2G)
-H, --si likewise, but use powers of 1000 not 1024
-i, --inodes list inode information instead of block usage

This maybe aswer to your question.

Re: Difference between show system disk usage and df -H

the_rock — Tue, 25 Feb 2025 02:41:25 GMT

As @AkosBakos indicated, I also tested in R81.20 and R82 labs, and outputs were exactly the SAME. I wish I had logical explanation why yours are different.

Andy

Re: Difference between show system disk usage and df -H

G_W_Albrecht — Tue, 25 Feb 2025 08:49:22 GMT

Which CP version is this ? As the percent values are the same, this could be caused by using the different calculation models binary/decimal:

4,7 GB = 4,38 GiB

E.g. Windows Explorer shows GiB numbers but calls it GB...

Re: Difference between show system disk usage and df -H

AkosBakos — Tue, 25 Feb 2025 08:50:55 GMT

Hi @G_W_Albrecht

From the help:

-H, --si likewise, but use powers of 1000 not 1024

Akos

Re: Difference between show system disk usage and df -H

the_rock — Tue, 25 Feb 2025 13:28:20 GMT

That makes sense.