Subject: Re: overfull disk
To: Jaromir Dolecek <email@example.com>
From: Bill Sommerfeld <firstname.lastname@example.org>
Date: 01/31/1999 14:01:13
> I run out of disk space the other day and df output looked a bit wierd:
> dolecek~ > df
> Filesystem 1K-blocks Used Avail Capacity Mounted on
> /dev/wd0a 990582 961902 -20850 102% /
(McKusick, Joy, Leffler, Fabry: A Fast File System for UNIX), section 3.
In order for the layout policies to be effective, a file system
cannot be kept completely full. For each file system there is a
parameter, termed the free space reserve, that gives the minimum
acceptable percentage of file system blocks that should be free.
If the number of free blocks drops below this level only the system
administrator can continue to allocate blocks.
The df command reports the percentage of *available* space, (not the
percentage of *total* space) which is in use.
One nit, though.. the next sentance is an interesting claim:
The value of this parameter may be changed at any time,
even when the file system is mounted and active.
.. however, a, umm, documented bug in tunefs prevents this from happening...