This is the smallest of the periodic multicast-packet delta samples UCS Manager collected within the current stats interval, expressed as a 64-bit unsigned count. It matters on the live receive-side counter set UCS Manager keeps for one Ethernet endpoint (a blade's vNIC adapter port, an I/O Module uplink, or a fabric-interconnect server port) inside a UCS domain because it shows the quietest moment for multicast arrivals (IGMP/ARP-like flood traffic, HSRP hellos, etc.) during the sampling window, separate from the average or peak. A value that stays near 0 while multicastPacketsDeltaMax spikes to several thousand on this interface points to bursty multicast traffic rather than a steady stream.