A host upgrade or migration is not complete until you have ensured that the host is reconnected to its managing vCenter Server and reconfigured if necessary, and that the host license is reapplied or upgraded.
After you upgrade or migrate a host, take the following actions:
View the upgrade logs. You can use the vSphere Web Client to export the log files.
If vCenter Server manages the host, you must reconnect the host to vCenter Server by right-clicking the host in the vCenter Server inventory and selecting Connect.
When the upgrade is complete, ESXi is in evaluation mode. The evaluation mode period is 60 days. You must reapply your license or assign an upgraded license to your product within 60 days after the upgrade. Use the License Portal and the vSphere Web Client to configure licensing. See the vCenter Server and Host Management.
On the VMware Web site, log in to your account page to access the license portal. From the license portal, upgrade your ESXi license. Use the vSphere Web Client to assign the upgraded license key to the host.
The host sdX devices might be renumbered after the upgrade. If necessary, update any scripts that reference sdX devices.
After the upgrade, convert any ESX 3.x-style /adv/Disk/MaskLUNs LUN masks to the claim rule format. Run the esxcli storage core claimrule convert command in the vSphere Command-Line Interface (vCLI). This command converts the /adv/Disk/MaskLUNs advanced configuration entry in /etc/vmware/esx.conf to claim rules with MASK_PATH as the plug-in.Caution:
This conversion will not work for all input MaskLUNs variations. See the vSphere Command-Line Interface Reference.
Upgrade virtual machines on the host. See Upgrading Virtual Machines and VMware Tools.