> Source: [sk131412](https://support.checkpoint.com/results/sk/sk131412)

# sk131412 - Available Hardisk space in "df -h" output seems wrong

| Property | Value |
|----------|-------|
| Solution ID | sk131412 |
| Date Created | 2018-07-13 |
| Last Modified | 2022-07-28 |
| Technical Level | Advanced |
| Products | Security Gateway, Security Management Server |
| Versions | R82.10, R82, R81.20, R82.10, R82, R81.20, R82.20 |
| OS | Gaia |

## Symptoms

- Calculating the available space using the `"df -h"` command, does not seem correct.  
For example:

```

[Expert@hostname:0]# df -h
Filesystem                        Type   Size  Used Avail Use% Mounted on
/dev/mapper/vg_splat-lv_current   ext3   35G   25G  8.6G  74%
proc                              proc   0     0    0      -   /proc
sysfs                             sysfs  0     0    0      -   /sys
devpts                            devpts 0     0    0       -  /dev/pts
/dev/sda1                         ext3   289M  24M  251M   9%  /boot
tmpfs                             tmpfs  5.8G  4.0K 5.8G   1%  /dev/shm
/dev/mapper/vg_splat-lv_log       ext3   468G  373G 72G    84% /var/log
```

Calculating the number of available space, it is not correlated to the size-used space, in the var log partition. (486-373=113G, however, the available space is only 72G!)

## Cause

Standard behavior of Linux in *ext*file system.

By default, in *ext* file system, 5% of the file system is kept by root.

Using the command "*tune2fs -l \</dev/\<partition_name\>*", you can see the "reserved block counts", which is the blocks reserved by the system.

**Related solutions:**

* [sk106844 -df command shows wrong used space percentage](https://supportcenter.checkpoint.com/supportcenter/portal?eventSubmit_doGoviewsolutiondetails=&solutionid=sk106844)

## Solution

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