In a blade server environment, the number of vNICs and vHBAs configurable for a service profile is determined by adapter capability and the amount of virtual interface (VIF) namespace available on the adapter. In Cisco UCS, portions of VIF namespace are allotted in chunks called VIFs. Depending on your hardware, the maxiumum number of VIFs are allocated on a predefined, per-port basis.
The maximum number of VIFs varies based on hardware capability and port connectivity. For each configured vNIC or vHBA, one or two VIFs are allocated. Stand-alone vNICs and vHBAs use one VIF and failover vNICs and vHBAs use two.
The following variables affect the number of VIFs available to a blade server, and therefore, how many vNICs and vHBAs you can configure for a service profile.
Maximum number of VIFs supported on your fabric interconnect
How the fabric interconnects are cabled
If your fabric interconnect and IOM are configured in fabric port channel mode
For more information about the maximum number of VIFs supported by your hardware configuration, see Cisco UCS 6100 and 6200 Series Configuration Limits for Cisco UCS Manager for your software release.