SESparse snapshot recovery
VMware uses space-efficient sparse formats for some snapshots and linked storage workflows. SESparse metadata tracks allocated grains and space reclamation; damage can stop a VM, break consolidation, or expose an older guest state.
Understand the symptom
A child snapshot contributes newer guest sectors while unchanged reads fall through to its parent. Recovery maps descriptors and CIDs, validates sparse metadata and grain locations, and determines whether UNMAP or reclamation state affects block interpretation before assembling a protected guest view.
What you may see
vSphere continues to request consolidation after an attempted cleanup.
The host rejects an SESparse extent or its descriptor.
Recent changes may remain trapped in an unreadable child.
The snapshot file may be affected by underlying VMFS or storage faults.
Protect the source
Consolidation can propagate a bad interpretation into a healthier parent.
Matching CIDs does not prove that extents belong to the same guest history.
Blocks marked unused at one layer cannot be interpreted without chain context.
Do this now
Pause snapshots, backup, replication, Storage vMotion, and consolidation.
Copy all descriptors, extents, deltas, VMX, VMSD, NVRAM, and logs.
Record snapshot manager state, file listings, CIDs, parent hints, and exact errors.
Snapshot or image failing storage before deep reads or repair attempts.
NEPFOSYS process
NEPFOSYS establishes parent-child order and identifies every extent needed for the newest state.
Candidate metadata and grain mappings are tested on copies against guest structures.
Recovered partitions, databases, and priority files are checked from the reconstructed chain.
A clear next step
Start a case with the exact symptoms, incident timeline, prior attempts, encryption details, and the files that matter most. NEPFOSYS will route the case to the appropriate DFW intake or nationwide mail-in path.
Start with a case reviewQuestions, answered
No. VMware uses several sparse formats; the descriptor, extent type, and platform version must be identified.
That produces an older state when child snapshots contain newer writes.
VMware logs can identify the exact chain, disk opens, snapshot operations, and first failing extent.
DFW local · Nationwide mail-in