Kernel-based Virtual Machine (KVM) has become one of the most popular hypervisors in the Linux ecosystem, providing near-native performance for virtualized workloads. Migrating physical servers to KVM virtual machines requires careful planning to avoid downtime and data loss.
Planning the P2V Migration
The first step in any physical-to-virtual migration is performing a thorough inventory of the source server. Document all installed services, network configurations, storage layouts, and application dependencies. Tools like virt-p2v and disk2vhd can capture a running physical system and convert it into a virtual disk image compatible with KVM.
Once the image is captured, you must configure the destination KVM host with appropriate resources. Allocate CPU cores, memory, and storage that match or exceed the original hardware. Use virtio drivers for disk and network interfaces to achieve the best I/O performance within the guest.
After the migration, verify that all services start correctly and that network connectivity is restored. Update DNS records, monitoring systems, and backup schedules to point to the new virtual machine. It is wise to keep the physical server powered on but isolated for at least two weeks as a rollback option.