Verifying that the cluster is ready to be reverted | ONTAP

Verifying cluster health (verifying that the cluster is ready to be reverted)
Before and after you upgrade, revert, or downgrade a cluster, you should verify that the nodes are healthy and eligible to participate in the cluster, and that the cluster is in quorum.

Verifying storage health (verifying that the cluster is ready to be reverted)
Before and after you upgrade, revert, or downgrade a cluster, you should verify the status of your disks, aggregates, and volumes.

Verifying the system time
You should verify that NTP is configured, and that the time is synchronized across the cluster.