This high-level overview describes the process for migrating an ESX/ESXi 4.x host to an ESXi 5.1 installation that is deployed by using vSphere Auto Deploy.

This scenario assumes the following details about your vSphere environment.

The hosts that you are migrating are managed by a vCenter Server running vCenter Server 4.x.

All hosts managed by that vCenter Server are running ESX/ESXi 4.x.

The following tasks provide an overview of the migration process.

1

Create host profiles for the ESXi 4.x hosts to be migrated and attach the host profiles to the hosts.

See the vSphere Host Profiles documentation.

2

Upgrade the 4.x vCenter Server to version 5.1.

See Upgrading to vCenter Server 5.1.

3

Prepare your Auto Deploy server and environment.

This preparation includes setting up the DHCP and TFTP servers that are used to PXE-boot Auto Deploy host machines and installing VMware PowerCLI.

See the information about preparing for vSphere Auto Deploy in the vSphere Installation and Setup documentation.

4

Apply an image profile for an ESXI 5.1 host that is deployed by using the Auto Deploy PowerCLI commands.

See the information about Auto Deploy in the vSphere Installation and Setup documentation.

5

Use vSphere vMotion to evacuate all virtual machines from the hosts to be migrated, and place the hosts in maintenance mode.

See the vCenter Server and Host Management documentation.

6

Reboot the hosts, enter the BIOS, and reconfigure the hosts to boot from the network.

See the information about Auto Deploy in the vSphere Installation and Setup. For ESXi 4.x hosts with compatible host profiles, the host configuration will be restored.

7

When one host is booted, complete any host configuration that was not migrated and take a host profile from the host.

See the vSphere Host Profiles documentation.

8

Clone the host profile and attach the profile to the other migrated hosts.

See the vSphere Host Profiles documentation.

9

Update the answer file of each cloned profile to provide host-specific configuration details, such as the IP configuration.

See the vSphere Host Profiles documentation.