Are UCS IO modules active/active?

[pettitm]

Hello,

Trying to find out how much throughput I have between my FIs and Chassis IO Modules. I know the FIs are active/active from an interface standpoint, but not sure about the IO Modules in the Chassis'. For each Chassis, I have 2 "H10GB CU3M" going from FI-A to IO Module 1 and 2 "H10GB CU3M" going from FI-B to IO Module 2. First question is, does that give me 20G for the entire Chassis or 40G? Second questions is, should we have set this up so that each IO Module has one connection to FI-A and one to FI-B? I guess if everything is active/active then it doesn't really matter.

Thank you in advance for your time and response!

[Wes Austin · Accepted solution]

Both IOM are active if you have vNIC pinned to both A and B side fabrics. You want connections from FI-A to IOM-A and FI-B to IOM-B. You have 20G on A side and 20G on B side, however, if you have eight blades in a chassis, this 20G is divided amongst the blades.

Looking here, you see I have a vNIC pinned to A and B side fabric, so if I am utilizing both links, this would be a situation where both IOM are active at the same time.

This documentation should also be beneficial for you to review:

https://www.cisco.com/c/en/us/solutions/collateral/data-center-virtualization/unified-computing/whitepaper_C11-720526.html

https://www.cisco.com/c/en/us/products/collateral/servers-unified-computing/ucs-manager/whitepaper_c11-697337.html

[pettitm]

Thank you very much for the response! I do have vNICs on both A and B sides. Just for my clarity, will you please let me know what is true in my situation? I have two 10G from FI-A to IO Module 1, and two 10G from FI-B to IO Module 2. Thank you!

1. Each blade in the chassis could do 20G but the chassis total to the FI is also 20G (to be split among all blades in the chassis)?

1. Each blade in the chassis could do 20G but the chassis total to the FI is 40G (to be split among all blades in the chassis)?

2. Each blade in the chassis could do 40G but the chassis total to the FI is also 40G (to be split among all blades in the chassis)?