The reasons for migrating to the Cloud vary: rising operating costs, new security requirements, or greater flexibility. Especially with complex system landscapes, a planned and controlledagis crucial.
Anyone who manages systems that have evolved over many years knows the challenges. The infrastructure functions, but it's outdated. Updates are risky, hardware is no longer available, and expertise is leaving the company. Migrating to a new, clean environment—for example, to a VMware-based Cloud infrastructure—makes technical sense, but is often not directly feasible. Especially when changing hypervisors, such as from Hyper-V, KVM, or Proxmox to a VMware environment, traditional migration reaches its limits. Cold migration also offers a clearly structured and reliable approach for transferring physical systems to a virtual platform.
What distinguishes Cold Migration from other approaches
Cold migration involves transferring virtual machines to a new Cloud environment while they areagoff. No dataagoccurs during operation, preventing potential inconsistencies. This approach is particularly suitable for systems that cannot tolerate ongoing changes or require a clean break. It also allows for switching virtualization platforms.
Platform-independent migration with a clear structure
A major advantage of cold migration lies in its technical independence from the source environment. By using VMware Cloud Director Availability (VCDA), the entire virtual machine is replicated directly, without requiring a specific export format or additional third-party tools. This means that regardless of whether the VM was previously running under Hyper-V, Proxmox, KVM, or another hypervisor, the cloning process works automatically and completely via the Netstream infrastructure.
No intermediate step involving VMDK, OVF, or OVA is necessary. Tools like Veeam, Acronis, or Clonezilla are also not required for this process. The migration is structured and performed using the VMware Cloud Director Availability Stack. This significantly reduces the complexity of the preparation, which is crucial, especially in heterogeneous or historically grown environments.
After import, the machine is initially deployed in a separate resource pool within the target system. There, all components such as network adapters, firewall rules, storage media, and resource classes can be configured and tested before the machine is put into operation.
Netstream supports cold migration from, among other environments, the following:
- VMware vSphere or ESXi
- Microsoft Hyper-V
- Nutanix AHV
- Proxmox VE
- KVM-based systems
- Bare Metal Systems
Prepare network,agand security
The network connection can also be fully configured in advance. VMware NSX allows for the mapping of VLANs, gateways, NAT rules, and VPN endpoints. For hybrid scenarios, an IPsec connection between the source and destination systems is available.
Variousagclasses can be used, ranging from standard to IOPS-optimized SSD volumes. Allocation is done per virtual disk, allowing for targeted control of performance and costs.
An additional snapshot can be created before switching over. This keeps the original virtual machine available as a fallback option for a defined period. The production launch is scheduled, often outside of normal business hours.
Conclusion: Platform-independent migration with a clear structure
Cold migration is particularly suitable when systems need to beagfrom an existing infrastructure to a new VMware environment independently. Typical scenarios include switching from Hyper-V, Proxmox, or KVM to VMware, or virtualizing formerly physical servers. Because each virtual machine is started and migrated individually using a preparedag, theagis sequential and targeted for each system.
This method allows for the controlled migration of individual machines to a new environment, regardless of compatibilities or dependencies within the source system. It is not necessary for the source and target environments to use the same virtualization technology. Network configurations, hostnames, and operating systems can be reviewed and adjusted during the migration.
The target environment is based on VMware Cloud Director. It is designed to be multi-tenant and offers features such as resource reservation, API control, role-based access management, Backup integration, and reporting as standard.
