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The feature that enables high availability of virtual machines in Huawei FusionCompute is automatic restart after failure. This feature plays a crucial role in ensuring that virtual machines can quickly recover from unexpected downtime caused by hardware failures or other issues. When a virtual machine stops functioning, the system detects the failure and automatically restarts the virtual machine on another host within the cluster. This minimizes service disruption and enhances overall reliability.

In the context of high availability, automatic restarts are essential because they reduce the recovery time objective (RTO) for applications running on those virtual machines, allowing services to resume with minimal human intervention. This is particularly important for mission-critical applications that need to maintain uptime and availability.

Other options, while related to the management and maintenance of virtual machines, do not directly contribute to automatic recovery in the same way. Manual server migration provides flexibility but requires human effort and does not offer the automatic failover needed for high availability. Event logging is vital for identifying issues over time but does not impact the immediate availability of virtual machines. Scheduled maintenance helps to plan downtime for updates and upgrades, but it does not inherently make systems more resilient to failures.