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To configure a vCon and the associated vNICs and vHBAs for explicit assignment, do the following:
• Set the vCon configuration to any of the available options. You can configure the vCons through a
vNIC/vHBA placement policy or in the service profile associated with the server. If a vCon is configured
for All, you can still explicitly assign a vNIC or vHBA to that vCon.
• Assign the vNICs and vHBAs to a vCon. You can make this assignment through the Virtual Host Interface
Placement properties of the vNIC or vHBA or in the service profile associated with the server.
If you attempt to assign a vNIC or vHBA to a vCon that is not configured for that type of vNIC or vHBA,
Cisco UCS Manager displays a message box to advise you of the configuration error.
During service profile association, Cisco UCS Manager validates the configured placement of the vNICs and
vHBAs against the number and capabilities of the physical adapters in the server before assigning the vNICs
and vHBAs according to the configuration in the policy. Load distribution is based upon the explicit assignments
to the vCons and adapters configured in this policy.
If the adapters do not support the assignment of one or more vNICs or vHBAs, Cisco UCS Manager raises a
fault against the service profile.
vCon to adapter assignment occurs in a round-robin order. This order means that vNICs are placed on the
adapters in the following order: vcon-1, vcon-3, vcon-2, vcon-4. As a result, under the following
circumstances, the PCIE order of vNICs can be different than the explicit assignment configured in Cisco
UCS Manager:
Note
• In a server with two adapters when vNICs are explicitly assigned to all four vCons.
• When a service profile that includes explicit assignment is migrated from a server with a higher
number of adapters to one with a lower number of adapters.
Implicit Assignment of vNICs and vHBAs
With implicit assignment, Cisco UCS Manager determines the vCon and, therefore, the adapter to which a
vNIC or vHBA is assigned according to the capability of the adapter. Use this assignment option if the adaptor
to which a vNIC or vHBA is assigned is not important to your system configuration.
To configure a vCon for implicit assignment, do the following:
• Set the vCon configuration to All, Exclude Dynamic, or Exclude Unassigned. You can configure the
vCons through a vNIC/vHBA placement policy or in the service profile associated with the server.
• Do not set the vCon configuration to Exclude Assigned. Implicit assignment cannot be performed with
this setting.
• Do not assign any vNICs or vHBAs to a vCon.
During service profile association, Cisco UCS Manager verifies the number and capabilities of the physical
adapters in the server and assigns the vNICs and vHBAs accordingly. Load distribution is based upon the
capabilities of the adapters, and placement of the vNICs and vHBAs is performed according to the actual
order determined by the system. For example, if one adapter can accommodate more vNICs than another, that
adapter is assigned more vNICs.
If the adapters cannot support the number of vNICs and vHBAs configured for that server, Cisco UCS Manager
raises a fault against the service profile.
Cisco UCS Manager GUI Configuration Guide, Release 2.0
OL-25712-04 431
Configuring vNIC/vHBA Placement Policies