> /usr/local/sbin/htcacheclean -D -p/md/cache -l8M -v -t
Statistics:
size limit 8.0M
total size was 240.7M, total size now 7.8M
total entries was 3337, total entries now 309

> df -hi /md
Filesystem Size Used Avail Capacity iused ifree %iused Mounted on
/dev/md0 484M 445M 2.0K 100% 37k 27k 58% /md

いっぱいな状態。