Summary
Expanding a datastore backed by a Zadara VPSA is a straight-forward process that can be accomplished using the following 3 steps.
1) Expand Volume in VPSA GUI
2) Rescan storage devices in ESXi
3) Expand datastore in ESXi
1) Expand Volume in VPSA GUI
From the VPSA GUI visit the volume section, select the volume to expand, then click the expand button
Enter number of GB to expand by and click submit
2) Rescan storage devices in ESXi
Select host >> Configure >> Storage Devices >> Rescan and Refresh Storage
Device should show with the new, expanded capacity
3) Expand Datastore in ESXi
Select host >> Configure >> Datastores >> Select Datastore >> Increase Capacity
Select device to expand
Select "Use 'Free space X GB' to expand the the datastore" and select the amount to increase by
Verify info and Finish
Datastore is now expanded