Date: Wed, 30 Apr 2025 09:27:45 +0200
From: Edgar Fu� <e...@math.uni-bonn.de>
Message-ID: <aBHQ8WxxEI48Q1/t...@trav.math.uni-bonn.de>
| > By "fragments in use" do you mean
| >
| > 1) Fragment-sized pieces of disk with file data in them?
| > 2) Blocks with some but not all fragments occupied?
| > 3) Files with trailing sub-block portions?
| > 4) Fragment-sized pieces of disk occupied by (3)?
| Probably 1.
You probably really meant 4. Though that depends whether by 4
Mouse meant the extra 1..7 fragment sized bits at the end of the
file (the "trailing sub-block portions") or the total number of
frag sized pieces allocated by files which have trailing sub-block
portions. That wasn't clear from what was asked, but the former is
what I have been assuming was what you wanted to know (ie: how much
allocated space is in smaller than fs_bsize sized allocations, and so
on a raid with fs_bsize sized stripes how often would a RMW sequence be
needed for writing to a stripe).
1 is just what df tells you (how much space is used in the filesys,
just probably in different units).
kre
