For one of our host connection its showing 2 Bad Connections(PFA) in ISCSI connections. Can anyone help me out how to find it and how to fix the issues(for common issues).
The only thing that comes to mind is a volume or volumes that are no longer available. Like a snapshot or deleted volume without first disconnecting the volumes.
If you have support I would open a support case. They can either remote in, or review the logs for more info.
I would also check the Windows Events and array events logs for any errors.
As long as you have good connections to all your volumes in-use you should have no issue with a firmware upgrade. I would check that that all your data volumes are connected OK.