With ONTAP 9.8 and later, an HA pair must not run an ONTAP version from a release that is different from other HA pairs in the cluster for more than ninety (90) days. When the cluster is in a mixed ve...With ONTAP 9.8 and later, an HA pair must not run an ONTAP version from a release that is different from other HA pairs in the cluster for more than ninety (90) days. When the cluster is in a mixed version state, you should not enter any commands that alter the cluster operation or configuration, except as necessary to satisfy the upgrade requirements.