> So the solution is to never get more than 90% full disk space

while that's true, its not Henrik's main discovery. Henrik points
out that 1/4 of the arc is used for metadata, and sometime
that's not enough..

if
echo "::arc" | mdb -k | egrep ^size
isn't reaching
echo "::arc" | mdb -k | egrep "^c "
and you are maxing out your metadata space, check:
echo "::arc" | mdb -k | grep meta_

one can set the metadata space (1G in this case) with:
echo "arc_meta_limit/Z 0x4000000" | mdb -kw

So while Henrik's FS had some fragmentation, 1/4 of c_max wasn't
enough metadata arc space for number of files in /var/pkg/download

good find Henrik!

                        Rob
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