To upgrade virtual machines from ESX to ESXi (or from ESXi to ESX), you must perform a migration upgrade. You cannot perform an in-place upgrade from ESX to ESXi (or from ESXi to ESX). If a VMware ESX/ESXi version does not have upgrade support, perform a clean installation, after you save your VMFS datastore to another location or partition.

Note

For Upgrade Support to ESX 4.1 (includes support to ESX 4.1 updates) and Upgrade Support to ESXi 4.1 (includes support to ESXi 4.1 updates) the following details apply:

For more information about host upgrade and patch baseline, see the VMware vCenter Update Manager Installation and Administration Guide accessible on the VMware vCenter Update Manager Documentation page: http://www.configuresoft.net/support/pubs/vum_pubs.html.

The VersionInfo place holder used in file names, represents specific ESX or ESXi version information.

Upgrade Support to ESX 4.1 (includes support to ESX 4.1 updates) provides information about upgrade support for ESX. Upgrade support for a version of ESX usually includes all associated update releases. For example, where upgrading from ESX 4.0 is supported, upgrades from ESX 4.0 Update 1, ESX 4.0 Update 2, and so on are included. However, check the release notes of the ESX version to which you are upgrading for greater detail on ESX upgrade support.

Upgrade Support to ESX 4.1 (includes support to ESX 4.1 updates)

From ESX Version

File Name

Upgrade Tools Supported

ESX alpha, beta, or RC release (any)

N/A

No upgrade support

ESX 1.x

N/A

No upgrade support

ESX 2.5.x

N/A

No upgrade support

ESX 3.0.x

N/A

No upgrade support

ESX 3.5 (offline bundle)

Support applies to ESX 3.5 Update 5a only.

This file is a .iso file such as the following:

ESX-4.1.0-VersionInfo.iso

vCenter Update Manager 4.1 - host upgrade baseline

ESX 4.0 (offline bundle)

These files are .zip files such as the following:

upgrade-from-esx4.0-to-4.1VersionInfo.zip

pre-upgrade-from-esx4.0-to-4.1VersionInfo.zip

Install the pre-upgrade bulletin if you plan to use the vihostupdate utility or the esxupdate utility to get the new installer on the ESX server.

vCenter Update Manager 4.1 - host upgrade baseline

vihostupdateutility

esxupdate utility

ESX 4.1 (offline bundle)

This file is a.zip file such as the following:

update-from-esx4.1-4.1_VersionInfo.zip

vCenter Update Manager 4.1 - patch baseline

vihostupdate utility

esxupdate utility

ESX 4.1 (online patch)

This file is a roll up bulletin such as the following:

ESX410-VersionInfo

vCenter Update Manager 4.1 - patch baseline

Upgrade Support to ESXi 4.1 (includes support to ESXi 4.1 updates) provides details of upgrade support for ESXi. Upgrade support for a version of ESXi usually includes all associated update releases. For example, where upgrading from ESXi 4.0 is supported, upgrades from ESXi 4.0 Update 1, ESX 4.0 Update 2, and so on are included. However, check the release notes of the ESXi version to which you are upgrading for greater detail on ESXi upgrade support.

Upgrade Support to ESXi 4.1 (includes support to ESXi 4.1 updates)

From ESXi Version

Upgrade Tools Supported

ESXi 3.5 (offline bundle)

Support applies to ESXi 3.5 Update 5 only.

This file is a .zip file such as the following:

upgrade-from-esxi3.5-to-4.1_VersionInfo.zip

vCenter Update Manager 4.1 - host upgrade baseline

ESXi 4.0 (offline bundle)

This file is a .zip file such as the following:

upgrade-from-esxi4.0-to-4.1_VersionInfo.zip

vCenter Update Manager 4.1 - host upgrade baseline

vihostupdate utility

ESXi 4.1 (offline bundle)

This file is a .zip file such as the following:

update-from-esxi 4.1-4.1_VersionInfo.zip

vCenter Update Manager 4.1 - patch baseline

vihostupdate utility

ESXi 4.1 (online patch)

This file is a roll up bulletin such as the following:

ESXi410-VersionInfo

vCenter Update Manager 4.1 - patch baseline