Re: df 顯示的磁碟大小怪怪的？
因為系統會保留 8% 的空間來給 root 用
當 HD 剩餘容量小於 8% 時，只有 root 才可使用
當然可以調整，請 man tunefs
-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.
If the value is raised above the current usage level, users will
be unable to allocate files until enough files have been deleted
to get under the higher threshold.
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