@rockstorgorgo, welcome to the Rockstor community. While I probably don’t know the answer to your question, can you give a little more detail on the version of Rockstor (including the Kernel) you’re running (which you can find in the top right-hand corner above the dashboard).
Also, if you’re comfortable with the command line might be helpful to post the output of the btrfs fi show command. That clarifies how your pool looks. Your RAID level is 1, I presume?
There are a couple of other posts around SMB and NFS shares, but those are also somewhat older.
If you don’t get any conclusive answers you could take a look at this how-to:
However, I hope that @phillxnet or others can probably shed some additional light on this before you have to go down that path.