Troubleshoot VMware VMDK file lock errors that block VM power-on, snapshot consolidation, migration or disk operations.
01 Confirm the affected virtual disk
06 Validate after remediation Retry the original operation only after the lock source is understood. Confirm the VM powers on, snapshots are consistent and the datastore remains healthy.
Read the vCenter task and identify the exact VMDK or delta disk. Record the VM name, datastore, ESXi host and operation that failed before making changes.
Confirm the affected virtual disk
Check for active operations
Review snapshots, backup jobs, replication, vMotion and Storage vMotion. A backup or replication process can legitimately hold a virtual disk while an operation is running.
Check VM registration
Confirm the VM is registered on only the expected ESXi host. An abandoned registration after a host failure can leave an unexpected lock holder.
Inspect the datastore
Check free capacity, latency and connectivity. A storage problem can make a valid lock look like a file-access problem.
Identify the lock holder
Use ESXi shell diagnostics and the VM directory listing to determine which host or process owns the lock. Capture the evidence before stopping services or changing registrations.
Validate after remediation
Retry the original operation only after the lock source is understood. Confirm the VM powers on, snapshots are consistent and the datastore remains healthy.
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