Why does it show 0 in the available column?

[root@server log]# df
Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/sda2              4128448   4096484         0 100% /

It's an ext3 filesystem.


df reports the percentage of used blocks relative to the blocks not reserved for root use (by default I think it's 5% of the drive in ext3). It can be changed by using the -m option of tune2fs e.g. to set it to 2%

tune2fs -m 2 /dev/sdXY

The reserved blocks allow system daemons to keep going even when the disk is full, while non-root processes will not be able to write to it. It also helps reducing drive fragmentation.

Not the answer you're looking for? Browse other questions tagged or ask your own question.