Hi there!
First step is to login to each controller/node. From here, you want to verify that the storage is visible to both nodes, and that the network interfaces will failover appropriately.
To check the health of the backend storage connections, run the command: "sysconfig -a" to show the system status. You are looking for a line that says:
System Storage Configuration: Multi-Path HA
The next step is to view the network interface running status and failover status. Two commands for this: rdfile /etc/rc and ifconfig -a
From the output of the /etc/rc file, see which IPs failover to which ports on the other controller (partner statement). On the partner system, check those ports exist, and vis-versa. You are welcome to post the output of those files here for us to review, but I encourage you to redact any information that may expose external IPs or company names.
It is not that friendly, and we have updated this mechanism significantly in newer versions of ONTAP.
Then you want to check that the hosts using storage will tolerate the up-to-30 second blip during failover (usually much shorter, but plan for worst case). If running iSCSI or FC, ensure ALUA is setup and that hosts can see targets on both controllers.
Assuming all is configured correctly, it should all go smoothly.
Hope this helps!
