nvmeof rdma regression issue on 4.14.0-rc1 (or maybe mlx4?)

[Yi Zhang]

On 10/19/2017 05:44 PM, Sagi Grimberg wrote:
>
>> Hi Sagi
>> With this patch, no such error log found on host side,
>
>
> Awsome. that's the culprit...
>
>> but I found there is no nvme0n1 device node even get "nvme nvme0: 
>> Successfully reconnected" on host.
>
> That is expected because you did not persist a namespace UUID
> which caused the kernel to generate a random one. That confused
> the host as it got the same namespace ID with a different UUID.
>
> Can you please set a uuid when you rerun the test?
>
I tried add uuid filed on rdma.json, it works well now.

[root at rdma-virt-00 ~]$ cat /etc/rdma.json
{
   "hosts": [
     {
       "nqn": "hostnqn"
     }
   ],
   "ports": [
     {
       "addr": {
         "adrfam": "ipv4",
         "traddr": "172.31.0.90",
         "treq": "not specified",
         "trsvcid": "4420",
         "trtype": "rdma"
       },
       "portid": 2,
       "referrals": [],
       "subsystems": [
         "testnqn"
       ]
     }
   ],
   "subsystems": [
     {
       "allowed_hosts": [],
       "attr": {
         "allow_any_host": "1"
       },
       "namespaces": [
         {
           "device": {
             "nguid": "ef90689c-6c46-d44c-89c1-4067801309a8",
             "path": "/dev/nullb0",
             "uuid": "00000000-0000-0000-0000-000000000001"
           },
           "enable": 1,
           "nsid": 1
         }
       ],
       "nqn": "testnqn"
     }
   ]
}

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