The real DESCRIPTION field here is just the auto-generated stub "Cisco UCS fabric:FcSanPcEp:peerSlotId 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 slot number on the far end of this FC SAN port-channel member port's connection, when the peer device is organized into slots. This is only meaningful when the far end is itself a modular device (like another switch with line cards); for this FC SAN port-channel member port, it fills out the physical address of the specific SAN switch port that this one bundled member link connects to alongside peerPortId. This FC SAN port-channel member port might report peerSlotId 8 if the SAN switch it connects to has a modular chassis with that many line-card slots.