System information

another device that is already configured on the same path as the new device. This can be
done with various commands, such as l sscsi , scsi _i d , mul ti path -l , and l s -l
/d ev/d i sk/by-*. This information, plus the LUN number of the new device, can be used as
shown above to probe and configure that path to the new device.
3. After adding all the SCSI paths to the device, execute the mul ti path command, and check to
see that the device has been properly configured. At this point, the device can be added to
md , LVM, mkfs, or mo unt, for example.
If the steps above are followed, then a device can safely be added to a running system. It is not
necessary to stop I/O to other devices while this is done. Other procedures involving a rescan (or a
reset) of the SCSI bus, which cause the operating system to update its state to reflect the current
device connectivity, are not recommended while storage I/O is in progress.
25.7. Configuring a Fibre-Channel Over Et hernet Int erface
Setting up and deploying a Fibre-channel over Ethernet (FCoE) interface requires two packages:
fco e-uti ls
l l d pad
Once these packages are installed, perform the following procedure to enable FCoE over a virtual
LAN (VLAN):
Pro ced u re 25.4 . Co n f ig u rin g an Et h ern et in t erf ace t o u se FC o E
1. Configure a new VLAN by copying an existing network script (e.g. /etc/fco e/cfg -eth0 ) to
the name of the Ethernet device that supports FCoE. This will provide you with a default file to
configure. Given that the FCoE device is ethX, run:
# cp /etc/fcoe/cfg-eth0 /etc/fcoe/cfg-ethX
Modify the contents of cfg -ethX as necessary. Of note, D C B_R EQ UIR ED should be set to
no for networking interfaces that implement a hardware DCBX client.
2. If you want the device to automatically load during boot time, set ONBO OT = yes in the
corresponding /etc/sysco nfi g/netwo rk-scri pts/i fcfg -ethX file. For example, if the
FCoE device is eth2, then edit /etc/sysco nfi g /netwo rk-scri pts/i fcfg -eth2
accordingly.
3. Start the data center bridging daemon (d cbd ) using the following command:
# /etc/init.d/lldpad start
4. For networking interfaces that implement a hardware DCBX client, skip this step and move on
to the next.
For interfaces that require a software DCBX client, enable data center bridging on the
Ethernet interface using the following commands:
# dcbtool sc ethX dcb on
Then, enable FCoE on the Ethernet interface by running:
# dcbtool sc ethX app:fcoe e:1
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