The real DESCRIPTION field here is just the auto-generated stub "Cisco UCS fabric:FcSanPc:operSpeed managed object property", so it carries no real prose -- but the property name and its Gauge32 type tell you what it holds: It holds the speed this FC SAN port-channel has actually negotiated on the wire right now, regardless of what was configured. Comparing this to adminSpeed on the same FC SAN port-channel is a standard troubleshooting step: if adminSpeed says auto but operSpeed keeps coming up lower than expected, that mismatch usually points to a marginal SFP, a bad cable, or a speed-capped switch port on the far end. This FC SAN port-channel might show operSpeed 8Gbps even though it was configured for auto, reflecting whatever rate the two ends actually agreed on.