[Lustre-discuss] lctl tcp routing

Mohr Jr, Richard Frank (Rick Mohr) rmohr at utk.edu
Thu Nov 20 08:04:57 PST 2014

Are you using the same LNET names for the two file systems (ie - tcp0)?  Do the compute nodes have a single ethernet interface for both file systems, or do they have two (one on 172.16/16 and one on 192.168.200/24)?

Rick Mohr
Senior HPC System Administrator
National Institute for Computational Sciences

On Nov 20, 2014, at 9:15 AM, Alexander Oltu <Alexander.Oltu at uni.no>

> Hi,
> We have  a cluster with its internal Lustre filesystem with 10GbE
> TCP/IP lnet. The IP range is in 172.16/16 subnet.
> Now we want to mount an external Lustre filesystem on our compute
> nodes. The external FS has an IP range in 192.168.200/24 subnet.
> Switches from both are connected.
> We fixed routing tables on both subnets by:
> on 172.16 machines:
> route add -net dev eth0
> on 192.168.200 machines:
> route add -net dev eth0
> We can ping nodes each other from the both subnets. But lnet ping is not
> working and as such we can't mount external Lustre filesystem.
> I know that we can add virtual IPs on the compute nodes in 192.168.200
> range and it will work, but maybe someone knows about solution with
> routing tables and lctl routes?
> Thanks,
> Alex.
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