Quote from "snakyjake"
I'm presuming OMV+Samba+Greyhole will provide a single network share that will have pooled 1+ physical drives.
When I go to the OMV network share, I can see the two Samba shares I've created. I was expecting to see only 1 share (the Greyhole pool share).
Greyhole can allow any number of shares to use the pool. All the shares on which you enabled Greyhole will share the storage of the pooled drives.
For example, if you have a Videos and Photos shares, and both are using Greyhole, they will all appear to have the free space of all the drives in your pool, but when you add files in either share, the available space on both shares will decrease.
So create the shares you'd like to use the storage pool on (in the SMB service tab), and continue with step 6 to configure each share (in the Greyhole service page, Samba Shares tab). People usually create multiple shares (Documents, Videos, Photos, etc.)
And if you need further help on that, please post the screenshot the other guys asked for.