Lustre 1.6 Operations Manual

Networks
On the servers:
options lnet networks=tcp0(eth0),tcp1(eth1)
Elan-only clients:
options lnet networks=elan0
TCP-only clients:
options lnet networks=tcp0
IB-only clients
options lnet networks="iib0"
options kiiblnd ipif_basename=ib0
Note – In the case of TCP-only clients, all available IP interfaces are used for tcp0
since the interfaces are not specified. If there is more than one, the IP of the first one
found is used to construct the tcp0 ID.
ip2nets
The ip2nets option is typically used to provide a single, universal modprobe.conf
file that can be run on all servers and clients. An individual node identifies the
locally available networks based on the listed IP address patterns that match the
node's local IP addresses. Note that the IP address patterns listed in the ip2nets
option are only used to identify the networks that an individual node should
instantiate. They are not used by LNET for any other communications purpose. The
servers megan and oscar have eth0 IP addresses 192.168.0.2 and .4. They also have
IP over Elan (eip) addresses of 132.6.1.2 and .4. TCP clients have IP addresses
192.168.0.5-255. Elan clients have eip addresses of 132.6.[2-3].2, .4, .6, .8.
modprobe.conf is identical on all nodes:
options lnet 'ip2nets="tcp0(eth0,eth1)192.168.0.[2,4]; tcp0 \
192.168.0.*; elan0 132.6.[1-3].[2-8/2]"'
Note – LNET lines in modprobe.conf are only used by the local node to determine
what to call its interfaces. They are not used for routing decisions.
7-2 Lustre 1.6 Operations Manual • September 2008