Tsu-Fan Cheng <[EMAIL PROTECTED]> wrote:
> Hi,
> I have a pretty basic question: when I "df -H" my disk, the numbers
> cant add up,
>
>
> Filesystem Size Used Avail Capacity Mounted on
> /dev/ad0c 484G 429G 17G 96% /ad0c
>
>
> there should be more disk space available based on what is shown. why
> is this like that??
This is default behavior. From tunefs(8):
-m minfree
Specify the percentage of space held back from normal users; the
minimum free space threshold. The default value used is 8%.
Note that lowering the threshold can adversely affect perfor-
mance:
+o Settings of 5% and less force space optimization to always be
used which will greatly increase the overhead for file
writes.
+o The file system's ability to avoid fragmentation will be
reduced when the total free space, including the reserve,
drops below 15%. As free space approaches zero, throughput
can degrade by up to a factor of three over the performance
obtained at a 10% threshold.
Your df output suggests your minfree is set to the default 8%; to
confirm this:
% dumpfs /dev/ad0c | grep minfree | cut -f 1-2
--
Sahil Tandon <[EMAIL PROTECTED]>
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