Multiple ZSphere Windows VMs recover after manual startup following black screens or freezes

Issue

Use this article to troubleshoot multiple ZSphere Windows VMs that recover after manual startup following black screens or freezes.

Symptoms

• Multiple Windows VMs display black screens and recover after manual startup.
• Management-node services, storage status, and the libvirtd service appear normal.

Environment

• Product: ZVF
• Version: 4.x
• Component: ZSphere
• Affected object: VM stability
• Scenario: VM runtime issues. Confirm the current version, deployment topology, storage type, and operation timeline.

Possible causes

• Insufficient guest OS resources, blue screens or black screens, drivers, or patches.