delta.vmdk file: an incremental disk file that captures all changes made to the VM since the last snapshot was taken. vmdk file: a virtual disk file that contains the raw data in the virtual disk. The relationship can change if you have multiple branches in the snapshot chain.Ĭreating a VMware VM snapshot, you will create these files: Successive snapshots generate new child disks from the last child disk on the chain. When you create a snapshot for the first time, the first child disk is created from the parent disk. VM snapshots are not standalone, but depend on the parent VM disk or snapshot chain, and incrementally record changes since the last snapshot. You can take multiple snapshots for restoring the VM to multiple points in time. When taking a VM snapshot, all writable data will become read-only.
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In Microsoft Hyper-V environments, snapshots are also called checkpoints since Windows Server 2012 R2. It is a quick and efficient way to roll back VM to a specific point in time, just like the undo function. The state includes the power state of the VM (powered-on, powered-off, or suspended), and the data includes all the files that make up the VM (disk, memory, and other devices).
What is Virtual Machine snapshot (VM snapshot)Ī VM snapshot is an image that captures the complete state and data of a virtual machine at a specific point in time.
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Virtual machine backups and snapshots are both common measures to ensure data security.īut what is the difference between a snapshot and a backup, and how to use them properly? Many users have been troubled by this question. When using virtual machines, protecting data is one of the most important tasks. Virtual machine provide a secure sandbox environment for testing programs or accessing virus-infected data, the ability of not affectting physical machines has made it popular with businesses.
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