Which of the following are requirements for successful VMotion migration? (Choose Two)
A. Virtual Machines must have access to the same subnets on the source and destination hosts. B. Gigabit Ethernet networking must exist between the source and destination hosts.
C. Virtual Machines cannot be configured to use RDMs.
D. CPUs with the same clock speed and cache size must exist on both the source and destination hosts.
The Correct Answer and Explanation is:
The correct answers for the requirements for successful VMotion migration are:
A. Virtual Machines must have access to the same subnets on the source and destination hosts.
B. Gigabit Ethernet networking must exist between the source and destination hosts.
Explanation
A. Virtual Machines must have access to the same subnets on the source and destination hosts.
For a successful VMotion migration, the virtual machine (VM) must maintain its network connectivity throughout the process. This means that the VM should have access to the same subnet on both the source and destination hosts. If the VM’s network identity (IP address and MAC address) changes during migration, it can lead to loss of connectivity, affecting applications running on that VM. Keeping the VM on the same subnet ensures that network communication remains uninterrupted.
B. Gigabit Ethernet networking must exist between the source and destination hosts.
VMotion requires high bandwidth and low latency connections to ensure that the migration process is seamless and quick. Gigabit Ethernet is typically the minimum standard for VMotion to be effective, as it allows for the rapid transfer of VM memory and disk state between the hosts. Insufficient bandwidth can lead to extended downtime during migration, resulting in performance degradation and potential service disruptions.
C. Virtual Machines cannot be configured to use RDMs.
This statement is incorrect as VMotion can work with RDMs (Raw Device Mappings), although there are some considerations regarding storage types and compatibility.
D. CPUs with the same clock speed and cache size must exist on both the source and destination hosts.
This statement is misleading. While it is preferred for CPUs to have similar architectures, modern virtualization technologies, particularly VMware’s Enhanced VMotion Compatibility (EVC), allow for migration between CPUs with different clock speeds and cache sizes, provided they share a compatible instruction set and features.
In summary, the successful VMotion migration depends significantly on maintaining network connectivity and ensuring sufficient bandwidth between the hosts, which are covered in options A and B.