Before attempting recovery, identify the last valid snapshot in the chain. This requires logging into the ESXi host via SSH and navigating to the VM’s directory. Use the vmkfstools -e command to query the disk chain. If the output reports an error regarding parent linking, the chain is broken.
: Specialized software like Diskinternals VMFS Recovery or UFS Explorer can scan the raw blocks of an ESXi LUN. They can often find "orphaned" delta files and attempt to reconstruct the directory tree.
If the VM is functional but snapshots are stuck (often seen in "Needs Consolidation" warnings): : Use the Clone or Consolidate feature. delta vmdk recovery
: Use the CID (Content ID) check. Every VMDK has a CID in its descriptor file. If the parentCID of your delta file does not match the CID of the base disk, the chain breaks.
To execute a recovery, one must first understand the separation between the descriptor and the data. Before attempting recovery, identify the last valid snapshot
Snapshot configurations are highly fragile. The most common root causes of delta disk failures include:
: A small text-based descriptor file that links the delta to its parent. If the output reports an error regarding parent
Virtualization platforms (VMware vSphere, Workstation) use snapshots to preserve system states. A snapshot generates a (child) that records all writes since the snapshot creation while the parent VMDK remains read-only. While effective for backup and rollback, this redirection-logic structure is fragile. Corruption, accidental deletion of parent files, or improper snapshot consolidation can render the delta VMDK unrecoverable by standard hypervisor tools. This paper addresses how to recover data directly from a delta VMDK when the parent is missing, corrupt, or the snapshot chain is broken.
For partial recovery (only changed blocks since snapshot):
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