Hi all,

I am running a small Ceph cluster  (1 MON and 3OSDs), and it works fine.
However, I have a doubt about the two networks (public and cluster) that an OSD 
uses.
There is a reference from Mellanox 
(https://community.mellanox.com/docs/DOC-2721) how to configure 'ceph.conf'. 
However, after reading the source code (luminous-stable), I get a feeling that 
we cannot run Ceph with two NICs/Ports as we only have one 
'ms_async_rdma_local_gid' per OSD, and it seems that the source code only uses 
one option (NIC). I would like to ask how I could communicate with the public 
network via one RDMA NIC and communicate  with the cluster network via another 
RDMA NIC (apply RoCEV2 to both NICs). Since gids are unique within a machine, 
how can I use two different gids in 'ceph.conf'? 

Justin
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