[dm-devel] Can we add a command to display the physical topology link information from the host to the storage?

[dingwenyi]

We execute the multipath -ll output information as follows, and can not obtain the information about the host's initiator and storage target that can be directly recognized , such as WWN.
mpathe (360022a11000beb2a7fc8e9c500000001) dm-3 HUAWEI,S5500T
size=512G features='1 retain_attached_hw_handler' hwhandler='0' wp=rw
|-+- policy='service-time 0' prio=1 status=active
| `- 6:0:0:1 sde 8:64  active ghost running
`-+- policy='service-time 0' prio=1 status=enabled
  `- 7:0:0:1 sdd 8:48  active ready running
mpathd (360022a11000beb2a7fca035a00000004) dm-2 HUAWEI,S5500T
size=100M features='1 retain_attached_hw_handler' hwhandler='0' wp=rw
|-+- policy='service-time 0' prio=1 status=active
| `- 6:0:0:0 sdc 8:32  active ready running
`-+- policy='service-time 0' prio=1 status=enabled
  `- 7:0:0:0 sdb 8:16  active ghost running


We have a solution for the multipath path. Add a command to display the physical topology link information from the host to the storage, and display the following information to quickly and easily find the host and initiator information on the storage.
[root at redhat7 ~]# multipath -k
link-6:0:0 host-WWNN=iqn.1994-05.com.redhat:86329aefccdb host-WWPN=[unknown] target-WWNN=iqn.2006-08.com.huawei:oceanstor:21000022a10beb2a::1020002:129.13.100.240 target-WWPN=[undef]
link-7:0:0 host-WWNN=iqn.1994-05.com.redhat:86329aefccdb host-WWPN=[unknown] target-WWNN=iqn.2006-08.com.huawei:oceanstor:21000022a10beb2a::20003:129.13.100.241 target-WWPN=[undef]

could you agree with this solution or have a better solution?



I am looking forward to your reply.
Best wishes to you.
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