Then she remembered: VMware snapshots store previous block states in deltas. The base VMDK still has the original block from 467 days ago. But delta 14 has the latest write. The corrupted block in delta 09 might actually be stale—overwritten in a later delta.
She had to restore from the delta —not the base.
It was 2:00 AM on a Saturday when Maria’s phone buzzed with a severity-one alert. The finance department’s main ERP VM, , had crashed hard. The snapshot chain had been growing for 467 days—longer than anyone had been on the team. restore vmware from delta vmdk
She did something risky: manually edited the descriptor file of delta 14, pointing its parentFileNameHint to the actual CID of delta 13’s extent.
At 6:00 AM, the clone finished. She attached the new VMDK to a test VM. It booted. FSck was clean. She mounted the DB—all transactions present. Then she remembered: VMware snapshots store previous block
She powered off the test VM, detached the old broken chain, attached the restored VMDK to the original FinServe-07, and powered it on.
Maria’s manager whispered over the bridge line: “Just roll back to the snapshot. We lose a day, fine.” The corrupted block in delta 09 might actually
Maria documented everything and added a new rule: No snapshot older than 72 hours without a consolidation plan. She also wrote an internal tool called delta-forensics to map block dependencies across a chain.