Ext4: Reducing reservered blocks
2009 December 8
When you format an disk with ext4 a default of 5% reserved blocks are for privileged processes. In case the file system fills up important process can still fill up and continue to function.
To reduce the 5 % to 1 % use the following command:
sudo tune2fs -m 1 /dev/sda1
Make sure you use the correct partition.
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This is actually not ext4 specific and works on ext2/3 also.
Thx for the info.