I installed Mist (geth v1.6.0-stable) on MacOs and the sync works just as normal. I'm trying to run geth and use --datadir to use a external HDD volume. This fails with the error message geth.ipc: bind: invalid argument.
geth --datadir /Volumes/extHDD/ - fails
geth --datadir /usr/name/tmp - just works.
Appreciate any pointers.