Talk:Zpool
From OpenZFS on OS X
It would be nice to recommend setting the mount point at zpool creation time with the -m option to mount in the /Volumes folder as expected on OS X.
Response: /Volumes is supposed to be reserved for file systems mounted by Disk Arbitration, so this would be inappropriate.
sudo zpool create -f -o ashift=13 -O casesensitivity=insensitive -O normalization=formD -m /Volumes/$poolname $poolname mirror /dev/diskX /dev/diskY
Also, it sounds like ashift really should be 13 for most people.