A small company has recently purchased an MSA and two B-series SN3000B switches.

The issue of seeing multiple volumes after creating just a single volume on the MSA is likely due to a lack of zoning on the Fibre Channel switches. Zoning is a method used in Fibre Channel networks to segment a fabric into smaller, manageable zones, which helps in controlling access between devices. By enabling zoning on the SN3000B switches, the customer can isolate the connections and ensure that only the desired host can see specific volumes. This prevents the scenario where multiple volumes are visible to a host that should only have access to one.

References:

HPE MSA Storage Overview

HPE B-series SN3000B Switches