There are two userid/password combinations in an MDS switch.
If you can telnet/ssh into the switch, then you have the correct userid/password combination.
However, DCNM and DM use SNMP. So they use...
At a high level, for devices to see each other here, they need to be:
(1)On the same fabric ( could be one switch or more switches that are connected together via ISL ) and logged in.
(2)In the same VSAN ( No IVR ( inter-vsan routing ) her )
Looking at this I see that bootflash: is 68% full on the active sup and 99% on the standby sup.
You can see what is using this space ( I suspect old versions of firmware or configuration backups ) by doing:
dir bootflash: ...
Depending on what you have "distribute" set to for the VSAN, you are either distributing the active zoneset only or the active zoneset and the full zone database:
9148S-2# show zone status vsan 1
VSAN: 1 default-zone: deny distribute: active ...