This is the smallest single packet-delta sample UCS Manager observed among the sub-intervals making up the current reporting period. 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 a min of 0 tells an admin the interface went completely idle for at least one sub-interval, which is different from merely running below average. Seeing totalPacketsDeltaMin at 0 on this interface right before a reported connectivity complaint would support a theory that the link actually dropped traffic briefly rather than just slowed down.