If you are running fun_plug on your DNS-323, you may notice that your partitions are no longer unmounted properly at shutdown or reboot. You have this problem if you start seeing this line in your dmesg output:
EXT2-fs warning: mounting unchecked fs, running e2fsck is recommended
The solution to this problem is a utility called cleanboot. Unfortunately, since the first version, it has not worked for me and quite alot of other folks; instead of cleanly unmounting the partitions before shutting down or rebooting, it hangs the box. Bummer...
The good news is that a fellow forumer SilentException persisted and managed to fixed the utility for his box (forum post here). I just tried it and it works on mine too! Hooray! You may want to give it a shot and see if it works for you.