# Disk Utilization

**URL:** <https://community.unix.com/t/disk-utilization/306554>\
**Category:** Red Hat\
**Created:** [March 15, 2012, 5:52am UTC](https://community.unix.com/t/disk-utilization/306554 "2012-03-15T05:52:40Z")\
**Posts on this page:** 4\
**Page:** 1

<div class="post-metadata">

**Author:** ![Duffs22](https://community.unix.com/letter_avatar/duffs22/32/6_449c533f586939b6e5f246632a46421f.png) [@Duffs22](https://community.unix.com/u/Duffs22)\
**Post date:** [March 15, 2012, 5:52am UTC](https://community.unix.com/t/disk-utilization/306554/1 "2012-03-15T05:52:40Z")

</div>

Hi,

Can anybody explain why my newly created 120G FS shows 100% utilization when only 113G of disk space has been used? ......

```nohighlight
# df -h .
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg01-lvol0
                      119G 113G 0 100% /u02
#du -h /u02
16K /u02/lost+found
112G /u02/bckups/rmanfull
112G /u02/bckups
112G /u02

```

R,  
D.

---

<div class="post-metadata">

**Author:** ![Scott](https://community.unix.com/letter_avatar/scott/32/6_449c533f586939b6e5f246632a46421f.png) [@Scott](https://community.unix.com/u/Scott)\
**Post date:** [March 15, 2012, 6:01am UTC](https://community.unix.com/t/disk-utilization/306554/2 "2012-03-15T06:01:18Z")

</div>

Reserved blocks?

```nohighlight
tune2fs -l /dev/mapper/vg01-lvol0 | grep "Reserved block"

```

---

<div class="post-metadata">

**Author:** ![Duffs22](https://community.unix.com/letter_avatar/duffs22/32/6_449c533f586939b6e5f246632a46421f.png) [@Duffs22](https://community.unix.com/u/Duffs22)\
**Post date:** [March 15, 2012, 6:03am UTC](https://community.unix.com/t/disk-utilization/306554/3 "2012-03-15T06:03:56Z")

</div>

Hi,

```nohighlight
# tune2fs -l /dev/mapper/vg01-lvol0 | grep "Reserved block"
Reserved block count: 1952816
Reserved blocks uid: 0 (user root)
Reserved blocks gid: 0 (group root)

```

Cheers!

---

<div class="post-metadata">

**Author:** ![mark54g](https://community.unix.com/letter_avatar/mark54g/32/6_449c533f586939b6e5f246632a46421f.png) [@mark54g](https://community.unix.com/u/mark54g)\
**Post date:** [March 15, 2012, 8:00am UTC](https://community.unix.com/t/disk-utilization/306554/4 "2012-03-15T08:00:12Z")

</div>

You can modify the reserved blocks, but they are often used by root to fix problems like this. I tend to reduce the 5% overhead when I am dealing with disks of over 100GB. 5GB is a large amount to allow for cleanup. When dealing with 1TB LUNs it is even more important to not bother with 5% waste, as those resources can be expensive.

look for the -m option in tune2fs