This trick (by Sumit Rai) was published in Linux For You (LFY) under the Tips And Tricks Section. Sharing it with all the Linux Geeks out there :)

When you format a partition in Linux , 5% of the total space gets reserved for privileged  processes, by default. This is done so that system processes continue to function correctly ,if the filesystem gets full. This is useful for your ‘root’ partition.However if you have let us say 50GB separate home partition, you may want to make use of few additional GBs by reducing the percentage of the reserved space. You can use tune2fs command to change  the default allocation of space  reserved for privileged  processes. Command for the same is :
#tune2fs -m 1  /dev/sda6
Here  we have changed space reserved for privileged  processes on /dev/sda6 to 1 percent. You can use your device file according to the target partition instead of  ‘/dev/sda6′ . You can see the effected change by mounting the filesytem and checking available space using df command before and after you execute the above command. This command is quite useful in so called ‘Emergency’, so do remember it :)

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