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Disk Utilization

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Operating Systems Linux Red Hat Disk Utilization
# 1  
Disk Utilization


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

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


Last edited by Duffs22; 03-15-2012 at 07:00 AM..
# 2  
Reserved blocks?

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

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# 3  

# 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)

# 4  
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
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