The entries contained in this file are the snapshots and relationships between each snapshot and its child disks. It contains the snapshot metadata and is the primary source of information for the snapshot manager. vmsd – This file is the database file for the snapshot itself. Data in the child VMDK disk is saved in the SPARSE format using the copy-on-write mechanism. It contains the difference between the current state of the virtual disk and the state that existed at the time that the previous snapshot was taken. -delta.vmdk – The delta disk is represented in the format of.vmdk – The flat.vmdk file contains the raw data in the base disk. The VMware snapshot operation creates several files with different extensions: In the VMware vSphere client, you can right-click the VM name, select Snapshots and click Take Snapshot to create a snapshot. The recovery process reads all the files in a sequential order starting with the parent disk file followed by the related delta files. If the latter is deleted or corrupted, then you can no longer recreate the VM. Note though that the child disks are directly dependent on the corresponding parent disk. This allows for quicker versioning and enhances protection against data loss incidents. The first snapshot is an exact image of your machine and the subsequent snapshots collect the changed data blocks only. The system creates child disks for each source disk of every snapshot. All changes are captured and written to newly-created delta disk files that are stored in the same folder as the base disk. When you take a snapshot, the state of the base virtual disk is recorded and maintained at that moment. Snapshots are generally used to restore a VM after a system failure, bad update or error. It preserves the state and the data of the VM including its power state (on, off or suspended) and all its files such as disks, memory and network interface cards. A snapshot is an exact record of a machine or system at a specific point in time.
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