The upgrade to vCenter Server impacts other software components of your datacenter.

Upgrading vCenter Server Components summarizes the impacts on your datacenter components.

Upgrading vCenter Server Components

Product

Component

Description

vCenter Server

VI Client 1.x

Not supported

VirtualCenter Server 1.x

Not supported

vSphere Client 4.0

Install

VirtualCenter Server 2.0

Upgrade

VirtualCenter Server 2.5

Upgrade

vCenter Server 4.0

Install

Oracle database

Verify that your database is supported. Upgrade if necessary.

Oracle 9i is no longer supported.

SQL database

Verify that your database is supported. Upgrade if necessary.

Microsoft SQL Server 2000 is no longer supported.

Linked Mode

Cannot join a Linked Mode group during the upgrade procedure. Join after the upgrade to vCenter Server is complete.

License server

License server

To manage ESX 3.x/ESXi 3.5 hosts, verify that the vCenter Server system is configured to use a license server. Install a license server if necessary.

ESX

ESX 2.5 host

Supported with vCenter Server 4.0, but cannot add the hosts to clusters.

VMFS2 volumes

Supported as read-only (deprecated)

ESX2 virtual machines

Support for ESX 2 virtual machines (virtual hardware version 3) starts with ESX 2. Support continues through ESX 4.0. Upgrade is optional, but strongly recommended.

VMDK2 virtual disk

The file layout introduced with ESX 2. Support continues through ESX 4.0. This is a single file with meta-data at the end.

ESX MUI

No change

VMware Tools

Upgrade (optional)

ESX 3.x/ESXi 3.5 host

Upgrade to ESX 4.0 (optional)

VMFS3 volumes

No change

ESX3 virtual machines

Support for ESX 3 virtual machines (virtual hardware version 4) starts with ESX 3. Support continues through ESX 4.0. Upgrade is optional.

VMDK3 virtual disk

The file layout introduced with ESX 3. Support continues through ESX 4.0. This is a two-file layout where a small descriptor file points to a data-file. This format allows features such as multiple snapshots.