Each option for migration to an SDDC that is compliant with this VMware Validated Design is based on the requirement to keep VM metadata, the availability of hardware, complexity of deployment and operation, and so on.

Virtual Machine Metadata

IT infrastructure contains metadata that is associated with each component. You use this metadata to keep track of the current settings and of historical changes, events, alarms and performance metrics. When migrating workloads between environments you must evaluate the importance of this metadata against the migration source.

Option A - New Greenfield Validated SDDC

Implementing a new greenfield SDDC according to this VMware Validated Design is the most direct method for reaching a state that is compliant with this design without migration work. After you implement this VMware Validated Design, you can manage it as a separate environment. You can use the new SDDC environment to stand up new workloads. The management components of and the workloads in the legacy environment can remain at their original location until you retire them.

Deploying a new standalone validated SDDC has the following attributes:

Table 1. Features of the New Greenfield Validated SDDC Migration Option

Attribute

Description

Advantages and disadvantages

Advantages

  • Reduced time to value because deployment is fast without migration work

  • Reduced implementation complexity

    You can leave the new and old environments isolated.

  • No legacy issues

  • The historical VM metadata is available in the old environment

  • Migration remains an option at a later date

Disadvantages

  • You must manage multiple environments.

  • The workloads might exceed the lifetime of the environment and you might have to migrate them in the end.

  • You must provide more hardware.

  • You must re-implement the integration with external and third-party components.

Alignment with this VMware Validated Design

High

Option B - Workload Migration

In the Workload Migration Option, you stand up a new greenfield SDDC according to this VMware Validated Design just as with Option A but you use Cross vCenter Server vMotion to move the existing workloads to the new environment. This option has the benefit of allowing the old and new environment to co-exist while the migration occurs, which allows for little to no downtime for the workloads.

After you evacuate the old environment, you can decommission it and reuse the hardware. You can also avoid purchasing new hardware because the physical hosts become free in the old environment. You can rebuild and add them to the new compute pods on a rolling basis. In this case, you must plan and schedule the migration on a per compute host basis.

Using a workload migration has the following attributes:

Table 2. Features of the Workload Migration Option

Attribute

Description

Advantages and disadvantages

Advantages

  • You can use the new environment immediately.

  • You can migrate old workloads on demand.

    You can reuse the old hardware as needed.

Disadvantages

  • Not all VM metadata history is migrated between environments.

  • You must provide more hardware while the two environments are running.

  • Operation overhead exists because you manage multiple environments.

  • You might need to migrate some workloads in waves to keep multi-VM applications intact.

  • You must re-implement the integration with external and third-party components.

Alignment with this VMware Validated Design

High

Option C - Architecture Alignment

Apply the Architecture Alignment Option to reuse investment or retain complete VM historical metadata. This migration option takes one or more existing components and reconfigures them to align them with the configuration that is prescribed in this VMware Validated Design.

This migration options requires significant planning and a well-defined starting point. Certain software configuration options cannot be re-configured and therefore might require a new implementation.

Using the Architecture Alignment Option has the following attributes:

Table 3. Features of the Architecture Alignment Migration Option

Attribute

Description

Advantages and disadvantages

Advantages

  • You must manage only one environment.

  • The historical VM metadata is available in the environment.

  • Integration with external and third-party components is preserved.

  • You provide minimal to none additional hardware.

Disadvantages

  • Significant time for planning and migration.

  • Planned downtime for reconfiguration.

  • More time for post-migration verification.

  • Inability to migrate all starting configuration.

  • You might not be able to align all starting configurations to this validated design.

Alignment with this VMware Validated Design

Medium

Option D - External Infrastructure Endpoint

Apply the External Infrastructure Endpoint Option to use an existing environment as a deployment option from within an SDDC that is compliant with this validated design. You configure the management pod in the validated SDDC to use the existing infrastructure and its cluster resources for compute workloads. The existing legacy environment (endpoint) does not match the specification of this VMware Validated Design and does not comply with the standards in this validated design.

This configuration has several management interfaces and requires additional effort for monitoring, alerting, backup, restore and disaster recovery.

Using the External Infrastructure Endpoint Option has the following attributes:

Table 4. Features of the External Infrastructure Endpoint Migration Option

Attribute

Description

Advantages and disadvantages

Advantages

  • The existing environment is intact.

  • The historical VM metadata is available in the existing environment.

  • You use a single tenant workload deployment interface.

  • You do not have to migrate hardware.

  • Integration with external and third-party components is preserved.

Disadvantages

  • External endpoint lifecycle (upgrade, patch, backup, restore, and disaster recovery) is not a part of the validated SDDC instance.

  • You must use additional monitoring interfaces.

  • You must provide more hardware.

  • You must manage multiple environments.

Alignment with this VMware Validated Design

Low