I did look through the documentation for the recommended specs to compare against what's in our environment. I couldn't find something specific to the vSZ-D but did use the specifications found for the overall release.
Per Ruckus documents for our release at the base Essentials install (1-2 nodes, 1-100 APs), they recommend:
100 GB HD, 2 vCPU, 13 GB RAM
10 GB HD, 8 vCPU, 13 GB RAM
I did increase the HD size on the vSZ-D instance to 100 GB from the 10 GB while it was gracefully shutdown. Another forum article indicated the device should detect this additional space and start using it.
Appreciate the response.