Monday, February 7, 2011

Palo vNIC or vHBA calculation


I got this tip from a good friend at Cisco. It great information when you start to design a UCS system.

It is generally advertised in marketing materials that the M81K Palo card can do a maximum 56 virtual interfaces (vNICS and/or vHBAs) (sometimes 128 in some marketing materials). 

This limit is actually set on the number of uplinks from the chassis to the fabric interconnect.  The formula is (15n-4) where N is the number of uplinks.  So plugin 1, 2 or 4 to get your max.

1 uplink per FEX:   15*1-4 = 11
2 uplinks per FEX: 15*2-4 = 26
4 uplinks per FEX: 15*4-4 = 56 (hence the maximum in the marketing slide)

Thanks Jason,


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