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.
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1<rant> Just because a question is covered by a broad other question doesn't make my specific question a dupe. If that were true, then we wouldn't need specific laws -- just one "Be nice to people".– 101010Aug 25, 2014 at 17:09
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I quote: "when I add the “Used” and “Available” columns of df, I don't get the total figure". That is exactly what you're asking.– phemmerAug 25, 2014 at 17:10
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This information has been covered multiple times before; see What happened to my free space? and Why is (free_space + used_space) != total_size in df?– G-Man Says 'Reinstate Monica'Aug 25, 2014 at 17:34
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1 Answer
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.
