If you’ve created a snapshot of a VM, and run the VM, the snapshot is active. As a result, the LUN will be available exclusively to a single host for a brief period of time. Also, creating a snapshot causes metadata updates, which can cause SCSI reservations conflicts that briefly lock the LUN. When you first create a snapshot, the VM activity will pause briefly if you ping a VM while creating a snapshot you will notice a few timeouts. Snapshots have an adverse impact on the performance of the server in several ways. Snapshots enabled Virtual machine can expect performance issues as the usage of the disk and memory is utilized more. Snapshot feature can be enabled and scheduled and can be reverted to any date as per the requirement. Reverting back to the snapshot will not take a long time like building an operating system, as this can be done less than 4 to 5 minutes. Snapshots can be also called as lifesavers as they can revert back to the original state of operating system when something goes wrong. Now if you take a still picture of him with a camera that can be considered as a snapshot and if you go for video recording the entire activity of your friend with the camera, then that can be called as a backup. A simple example would be to consider your friend walking towards you from the other side of the road. What are snapshots? It is very much similar to a well known feature called system restore that you would have come across in Windows OS, similar to that snapshot is a feature in VMware where it copies the Virtual machine disk file at certain point of time. What does this feature do and how does this really stick with VM snapshots? To get a better view, one should have knowledge in snapshots feature and snapshot manager. VM Consolidation is a feature in vSphere 4.0U2.
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