tune2fs, make free space to appear

ext2 ant ext3 file systems has reserved 5% disk space in case of dissapeared free space, for system proccesses. That system wouldn’t crash and would keep going.
For big filesystems those 5% are too much(with 1TB it would be 50G for system procceses), so we can tune a little bit.
You can check how much reserved space partition has with (You need root privileges for all actions):

to change reserved space (in percents)

check how much it got bigger

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