Run opensm with follow parameters:
opensm -c -o
It will make 1 loop and will exit (-o parameter). The -c option says to
opensm to generate option file.
The file will be generated under /var/cache/opensm//opensm.opts
Open the file and find line with "subnet_prefix". Replace the prefix
with new one.
Re-ran opensm: /etc/init.d/opensm start
It will automatically load the option file from cache repository and
will use new prefix
Jeff ,
Do we want to add it to Open-MPI FAQ ?
Regards,
Pasha
Jon Mason wrote:
I am getting the following error when I try to run OMPI over my dual
port IB adapter:
--------------------------------------------------------------------------
WARNING: There are more than one active ports on host 'vic20', but the
default subnet GID prefix was detected on more than one of these
ports. If these ports are connected to different physical IB
networks, this configuration will fail in Open MPI. This version of
Open MPI requires that every physically separate IB subnet that is
used between connected MPI processes must have different subnet ID
values.
Please see this FAQ entry for more details:
http://www.open-mpi.org/faq/?category=openfabrics#ofa-default-subnet-gid
NOTE: You can turn off this warning by setting the MCA parameter
btl_openib_warn_default_gid_prefix to 0.
--------------------------------------------------------------------------
I understand why it is doing the above based on the description in the
link above, but I cannot seem to find anywhere that will tell me how to
change the GID to something else.
Thanks,
Jon
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Pavel Shamis (Pasha)
Mellanox Technologies
