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As craig mentioned, the best way to "test" whether your connection works is to run the mkcloudserver command on the DSCLI once you think you have both DS8k and TS7700 configured. It will either work or it wont. If it succeeds, you have good paths between the two boxes. If it fails, there is some issue...and this is where it becomes difficult to determine as it can be any point in the network where ping/tracerouting will help determine the problem (e.g. packet loss, etc).
here is information about mkcloudserver command: mkcloudserver
If the object store is a TS7700 running FC5283 (Advanced Object Store), you will:
Please let me know if you are running the older FC5282 DS8000 Object Store feature. Setup-wize it is pretty close to the same but setting up a primary and secondary IP address to the TS7700 handles replication differently and there as some things you should know.
If you do experience a problem where mkcloudserver fails it could be a failure anywhere and in any path between the DS8000 and TS7700. mkcloudserver tests all paths and, if one path is no good it will fail. The default expectation is that each DS8k CEC TCT port will have 100% connectivity to every TS7700 grid link port. If the customer data center network is not configured to include 100% pathing both ways between these two systems (it can sometimes be configured this way when only like-subnet IP Address have available paths then we (TS7700) offers VTD_EXEC.369 that will restrict those routing paths that do not lie on the same subnet. You only want to use this EXEC if this is your use-case.
Another thing to know is the network configuration does not support Cisco ACI. ACI must be disabled otherwise it sometimes causes routing failure and will result in packet loss issue and the inability to configure between the boxes.
The DFSMS, TS7700 and DS8000 teams created a "cheat sheet" that summarizes some important things to know. It is just some quick information that may help you but wont contain details like some of the documents and links that can be found in the Library: https://community.ibm.com/community/user/storage/viewdocument/ibm-z-ds8k-tct-to-ts7700-user-cheat?CommunityKey=389634d3-147e-4db6-99d2-01852bb5a77f
Hope this helps