2

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.

7

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.

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