Had an issue this week on a pair of FAS8080s running 8.2.2P1 Cluster-Mode. During firmware upgrade for IOM6 module from version 0208 to 0209, I ran into ACP (Alternate Control Path) Connectivity Status showing "Partial Connectivity".
I followed the recommended action plan:
1. Disable the ACP feature in ONTAP:
>options acp.enabled off
2. Reseat the IOM module with the unresponsive ACP processor.
3. Reenable the ACP feature:
>options acp.enabled on
That however, did not resolve the issue and we had to replace the module in order to correct. I did not disable ACP prior to replacement.
After replacement, ACP shows status "Additional Connectivity":
ACP status then shows "Full Connectivity" with module status as "inactive (upgrading firmware)":
After firmware upgrade from 02.08 to 02.09, the module reboots:
It reports 02.09 firmware and status "inactive (initializing)":
And concludes with status "active":
I didn't expect to resolve this via HW replacement because it hadn't been reporting an ACP issue prior to the IOM6 firmware upgrade. But that's what resolved it.