An engineer must design the compute portion of a data center environment. The environment includes: - direct-attach Fibre Channel storage array with four 32 G Fibre Channel ports per controller - Cisc

Qty four 802.1q trunks from each IOM to each fabric interconnect does not specify PortChannel aggregation and implies separate logical links rather than bundled high-bandwidth physical channels, which is less optimal for performance and redundancy.

A four-port back-to-back PortChannel is not the typical connectivity model for IOMs to Fabric Interconnects; IOMs are fabric extenders that connect directly to FIs via aggregated uplinks.

A two-port PortChannel from each IOM to each fabric interconnect is a standard and highly available design. Each IOM 2408 has 10G uplinks, and a 2-port PortChannel provides 20 Gbps of bandwidth to each Fabric Interconnect, which is sufficient to handle the I/O for 32G Fibre Channel SAN ports when considering traffic aggregation from multiple blades through the IOM.

A four-port PortChannel from each IOM to each fabric interconnect would mean 8 cables per IOM (4 to FI-A, 4 to FI-B). While technically possible for an IOM 2408 (which has 8 uplinks), a two-port PortChannel per FI (total 4 uplinks per IOM) is often a more common and cost-effective design that still provides excellent performance and redundancy for 10G IOM uplinks to a 32G SAN.