红帽全球峰会12.3. Limitations for migrating virtual machines
Before migrating virtual machines (VMs) in RHEL 10, ensure you are aware of the migration’s limitations.
VMs that use certain features and configurations will not work correctly if migrated, or the migration will fail. Such features include:
- Device passthrough
- SR-IOV device assignment (With the exception of migrating a VM with an attached virtual function of a Mellanox networking device, which works correctly.)
- Mediated devices, such as vGPUs (With the exception of migrating a VM with an attached NVIDIA vGPU, which works correctly.)
- A migration between hosts that use Non-Uniform Memory Access (NUMA) pinning works only if the hosts have similar topology. However, the performance on running workloads might be negatively affected by the migration.
- Both the source and destination hosts use specific RHEL versions that are supported for VM migration, see Supported hosts for virtual machine migration
The physical CPUs, both on the source VM and the destination VM, must be identical, otherwise the migration might fail. Any differences between the VMs in the following CPU related areas can cause problems with the migration:
CPU model
- Migrating between an Intel 64 host and an AMD64 host is unsupported, even though they share the x86-64 instruction set.
- For steps to ensure that a VM will work correctly after migrating to a host with a different CPU model, see Verifying host CPU compatibility for virtual machine migration.
- Physical machine firmware versions and settings
- Migrating VMs between ARM 64 hosts is currently only supported between hosts with identical CPUs, firmware, and memory page size.
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