13Managing FabricsThe chassis supports a fabric type, which is Fabric A. Fabric A is used by the single I/O Module, and is always connected to the on-board Ethernet adapters of the servers.The chassis has only one I/O module (IOM), where the IOM is a pass-through or switch module. The I/O Module is classified asgroup A.Chassis IOM uses a discrete data path called Fabric, and it is named A. The Fabric A supports only Ethernet. Each server IO adapter(Mezzanine Card or LOM) can have either two or four ports depending on the capability. The mezzanine card slots are occupied byPCIe extension cards that are connected to PCIe cards (and not to IO modules). When you deploy the Ethernet, iSCSI, orFibreChannel networks, span their redundant links across banks one and two for maximum availability. The discrete IOM is identifiedwith a fabric identifier.NOTE: In the CMC CLI, the IOM is referred to by the convention, switch.Fresh Power-up ScenarioWhen the chassis is plugged in and turned on, the I/O module has priority over the servers. The IOM is allowed to turn on before theothers. At this time, verification of their fabric types is not performed.After the IOMs turn on, the servers turn on, and then CMC verifies the servers for fabric consistency.A pass-through module and switch are allowed in the same group if their fabric is identical. Switches and pass-through modules canexist in the same group even if they are manufactured by different vendors.Monitoring IOM HealthFor information about monitoring IOM health, see Viewing Information and Health Status of the IOM.Configuring Network Settings for IOMYou can specify the network settings for the interface used to manage the IOM. For Ethernet switches, the out-of-bandmanagement port (IP address) is configured. The in-band management port (that is, VLAN1) is not configured using this interface.Before configuring the network settings for the IOM, make sure the IOM is turned on.To configure the network setting of IOM in Group A, you must have the Fabric A Administrator privileges.NOTE: For Ethernet switches, the in-band (VLAN1) and out-of-band management IP addresses cannot be the same, orcannot be on the same network. This results in the out-of-band IP address in being not set. See the IOM documentationfor the default in-band management IP address.NOTE: Do not configure I/O module network settings for Ethernet pass-through and Infiniband switches.Configuring Network Settings for IOM Using CMC Web InterfaceTo configure the network settings for I/O Module:1. In the left pane, click Chassis Overview, click I/O Module Overview, and then click Setup. Alternatively, to configure thenetwork settings of the only available I/O module that is A, click A Gigabit Ethernet, and then click Setup.152
