I have a confusion about apparent conflicts between the minfree setting
and time/space optimization.

Per the manpage:
minfree -
Specify the percentage of space held back from normal users; the
minimum free space threshold.  The default value used is 8%.
This value can be set to zero, however up to a factor of three in
throughput will be lost over the performance obtained at a 10%
threshold.  Settings of 5% and less force space optimization to
always be used which will greatly increase the overhead for file

space/time -
The filesystem can either try to minimize the time spent allocat-
ing blocks, or it can attempt to minimize the space fragmentation
on the disk.  Optimization for space has much higher overhead for
file writes.  The kernel normally changes the preference automat-
ically as the percent fragmentation changes on the filesystem.

I have a large (120GB) drive dedicated to data storage.  I don't want to
commit 10% (12GB) of space to free space, and I don't need nearly that
much to avoid overflowing the volume.  However, I want to maintain time
optimization.  When it says that "settings of 5% and less force space
optimization to be used", is that still the case when you specify time

Also, why is "up to a factor of three in throughput" lost over the 10%
setting?  Is that another allusion to space optimization going into
effect, or is there something else happening?  I guess I don't understand
the ramifications of the minfree setting.  Any suggestions or references?



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