If we are planning to perform ONTAP code version from 9.11.1P6 to 9.15.1P16 for 10 node cluster please help what prechecks need to be taken care for upgrade readiness. Few points already validated:
1.Upgrade advisor shows incompatible switch is with target ONTAP.
2. Validated intercluster switch version current NXOS version is 9.3.5 so upgrade to NXOS 9.3.14. Current RCF is at 1.8 and is compatible with target ONTAP 9.15.1P16.
3. Validate current sp firmware and check whether current SP version is compatible with target ONTAP code version 9.15.1P16 but in SP compatability matrix not able to find 9.15.1P16 version to validate SP version compatibility. If upgrade is needed, Need to perform SP upgrade before ONTAP upgrade.
4.Upgrade path from 9.11.1P6 --> 9.11.1P16 --> 9.15.1P16
9.11.1P16 (this hop is for PANIC: page fault (supervisor read data, page not present) on VA 0x20 in process mlogd) --> Post 9.11.1P16 ONTAP perform bootarg disable to remediate pre check block Initialization of network interface failed on X91440A --> 9.15.1p16. is this a suggested path.
5.Most of the times Nodes are highly utilized(CPU crossing 50%). and Weekend we notice node utilization is stable below 50% for only 2 hours, whether we are can prefer to go with this 2 hours for ONTAP upgrade as it is a 10 node cluster.
6. Post ONTAP upgrade of 9.15.1P16 perform disk firmware, disk shelf and DQP upgrade.
7. Is the upgrade sequence correct: Intercluster switch upgrade - sp firmware - ONTAP upgrade - disk upgrade - disk shelf -DQP upgrade.
In addition to above points is there any additional checks/ground rules or requirements needed to perform ONTAP upgrade. And also advise on revert process whether it is disruptive. Any help is very much appreciated!!!!!
