switch from memcache to diskcache

Hi,

is it possible to instruct afsd to use a disk cache, if it was started
with -memcache?

And better, but I don't belive it is possible, can I tell afsd to leave
the disk cache and only use the memcache? AFS lives till the end of init,
so it isn't possible to unmount the afs disk cache. If I can tell afs to
only use the memcache, I can unmount the partition and reboot the
computer in a safer way.

Joerg.