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Chapter 16. Configuring Fibre Channel over Ethernet

Based on the IEEE T11 FC-BB-5 standard, Fibre Channel over Ethernet (FCoE) is a protocol to transmit Fibre Channel frames over Ethernet networks. Typically, data centers have a dedicated LAN and Storage Area Network (SAN) that are separated from each other with their own specific configuration. FCoE combines these networks into a single and converged network structure. Benefits of FCoE are, for example, lower hardware and energy costs.

16.1. Using hardware FCoE HBAs in RHEL
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In RHEL you can use hardware Fibre Channel over Ethernet (FCoE) Host Bus Adapter (HBA), which is supported by the following drivers:

  • qedf
  • bnx2fc
  • fnic

If you use such a HBA, you configure the FCoE settings in the setup of the HBA. For more information, see the documentation of the adapter.

After you configure the HBA, the exported Logical Unit Numbers (LUN) from the Storage Area Network (SAN) are automatically available to RHEL as /dev/sd* devices. You can use these devices similar to local storage devices.

16.2. Setting up an FCoE device
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After you complete this procedure, the exported LUNs from the Storage Area Network (SAN) are automatically available to RHEL as /dev/sd* devices. You can use these devices in a similar way to local storage devices.

Prerequisites

  • You have configured the network switch to support VLAN.
  • The SAN uses a VLAN to separate the storage traffic from normal Ethernet traffic.
  • You have configured the HBA of the server in its BIOS.
  • The HBA is connected to the network and the link is up. For more information, see the documentation of your HBA.

Procedure

  1. Install the fcoe-utils package: 

    # dnf install fcoe-utils
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  2. Copy the /etc/fcoe/cfg-ethx template file to /etc/fcoe/cfg-interface_name. For example, if you want to configure the enp1s0 interface to use FCoE, enter the following command: 

    # cp /etc/fcoe/cfg-ethx /etc/fcoe/cfg-enp1s0
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  3. Enable and start the fcoe service: 

    # systemctl enable --now fcoe
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  4. Discover the FCoE VLAN on interface enp1s0, create a network device for the discovered VLAN, and start the initiator: 

    # fipvlan -s -c enp1s0
Created VLAN device enp1s0.200
Starting FCoE on interface enp1s0.200
Fibre Channel Forwarders Discovered
interface       | VLAN | FCF MAC
------------------------------------------
enp1s0          | 200  | 00:53:00:a7:e7:1b
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  5. Optional: Display details about the discovered targets, the LUNs, and the devices associated with the LUNs: 

    # fcoeadm -t
Interface:        enp1s0.200
Roles:            FCP Target
Node Name:        0x500a0980824acd15
Port Name:        0x500a0982824acd15
Target ID:        0
MaxFrameSize:     2048 bytes
OS Device Name:   rport-11:0-1
FC-ID (Port ID):  0xba00a0
State:            Online

LUN ID  Device Name   Capacity   Block Size  Description
------  -----------  ----------  ----------  ---------------------
     0  sdb           28.38 GiB      512     NETAPP LUN (rev 820a)
     ...
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    This example shows that LUN 0 from the SAN has been attached to the host as the /dev/sdb device.

Verification

  • Display information about all active FCoE interfaces: 

    # fcoeadm -i
Description:      BCM57840 NetXtreme II 10 Gigabit Ethernet
Revision:         11
Manufacturer:     Broadcom Inc. and subsidiaries
Serial Number:    000AG703A9B7

Driver:           bnx2x Unknown
Number of Ports:  1

    Symbolic Name:     bnx2fc (QLogic BCM57840) v2.12.13 over enp1s0.200
    OS Device Name:    host11
    Node Name:         0x2000000af70ae935
    Port Name:         0x2001000af70ae935
    Fabric Name:       0x20c8002a6aa7e701
    Speed:             10 Gbit
    Supported Speed:   1 Gbit, 10 Gbit
    MaxFrameSize:      2048 bytes
    FC-ID (Port ID):   0xba02c0
    State:             Online
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