User's Manual

I/O Fabric Management 315

I/O Fabric Management

The chassis can hold up to six I/O modules (IOMs), each of which can be

pass-through or switch modules.

The IOMs are classified into three groups: A, B, and C. Each group has two

slots: Slot 1 and Slot 2. The slots are designated with letters, from left to right,

across the back of the chassis: A1 | B1 | C1 | C2 | B2 | A2. Each server has

slots for two mezzanine cards (MCs) to connect to the IOMs. The MC and

the corresponding IOM must have the same fabric.

The chassis supports three fabric or protocol types. The IOMs and MCs in a

group must have the same or compatible fabric types.

•

Group A

IOMS are always connected to the servers' on-board Ethernet

adapters; the fabric type of Group A will always be Ethernet.

•For

Group B,

the IOM slots are permanently connected to the

first MC

(

mezzanine card)

slot in each server module.

•For

Group C

, the IOM slots are permanently connected to the

second MC

(mezzanine card)

in each server module.

Each MC can support two external links. For example, in the first MC,

the first link is permanently connected to the IOM in slot 1 of Group B,

and the second link is permanently connected to the IOM in slot 2

of Group B.

NOTE: In the CMC CLI, IOMs are referred to by the convention, switch-n:

A1=switch-1, A2=switch-2, B1=switch-3, B2=switch-4, C1=switch-5,

and C2=switch-6.