Preparing for Migration

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Before beginning to migrate any type of vCenter Server deployment to an appliance, you must complete the preparation tasks.

Preparation tasks:

Synchronizing Clocks on the vSphere Network
Preparing vCenter Server Databases for Migration
Preparing to Migrate the Content Library
Prepare Managed ESXi Hosts for Migration
Download and Mount the vCenter Server Appliance Installer
Download and Run VMware Migration Assistant on the Source Windows Machine

Synchronizing Clocks on the vSphere Network
Verify that all components on the vSphere network have their clocks synchronized. If the clocks on the physical machines in your vSphere network are not synchronized, SSL certificates and SAML Tokens, which are time-sensitive, might not be recognized as valid in communications between network machines.
Preparing vCenter Server Databases for Migration
The vCenter Server Appliance instance requires a database to store and organize server data. Ensure your source vCenter Server database is prepared for migration to the target vCenter Server Appliance.
Preparing to Migrate the Content Library
When migrating from vCenter Server version 6.0 or earlier, you must prepare your environment before migrating the Content Library to prevent pre-check errors.
Prepare Managed ESXi Hosts for Migration
You must prepare the ESXi hosts that are managed by your vCenter Server installation before migrating it from Windows to an appliance.
Preparing vCenter Server Certificates for Migration
You must verify that your source vCenter Server certificates are prepared before you start the migration process.
System Requirements for the vCenter Server Appliance Installer
You can run the vCenter Server Appliance GUI or CLI installer from a network client machine that is running on a Windows, Linux, or Mac operating system of a supported version.
Determine the Oracle Database Size and the Storage Size for the New Appliance
Before upgrading a vCenter Server Appliance or migrating a vCenter Server on Windows that uses an external Oracle database, you must determine the size of the existing database. Based on the size of the existing database, you can calculate the minimum storage size for the new appliance so that the embedded PostgreSQL database can successfully assume the data from the old database with enough free disk space after the upgrade.
Determine the Microsoft SQL Server Database Size and the Storage Size for the New Appliance
Before upgrading a vCenter Server Appliance or migrating a vCenter Server on Windows that uses an external Microsoft SQL Server database, you must determine the size of the existing database. Based on the size of the existing database, you can calculate the minimum storage size for the new appliance so that the embedded PostgreSQL database can successfully assume the data from the old database with enough free disk space after the upgrade.
Download and Run VMware Migration Assistant on the Source Windows Machine
You must download and run the VMware Migration Assistant on your source vCenter Server or Platform Services Controller to prepare it for migration from Windows to an appliance. If you are using a deployment of vCenter Server with an external Update Manager that runs on Windows, download and run the VMware Migration Assistant on the source Windows machine where Update Manager runs to prepare Update Manager server and database for migration from Windows to the vCenter Server Appliance.

Parent topic: Migrating vCenter Server for Windows to vCenter Server Appliance

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