[Lustre-discuss] lnet & client client access

[Isaac Huang]

On Fri, Nov 06, 2009 at 12:34:34AM +0100, Piotr Wadas wrote:
> ......
> --
> options lnet networks=tcp0
> --

When an interface name has been omitted, the lnet would iterate over
the list of system IP interfaces (by SIOCGIFCONF) and choose the 1st
one whose status is "up" (SIOCGIFFLAGS) and has been configured with a
valid IP address (SIOCGIFADDR).

If that 1st interface happens to be 'eth0', then it's equivalent to
explicitly setting interface like:

> --
> options lnet networks=tcp0(eth0)
> --

Apparently, in the 1st configuration, 'eth0' is not always the
interface picked by lnet - 'eth0' could not have been configured an IP
address, and there could be other IP interfaces (e.g. IPoIB) that come
ahead of it.

Thanks,
Isaac