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Dell PowerVault MD 32XX/36XX Series Storage Arrays CLI Guide

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Using The Snapshot Feature

The following types of virtual disk snapshot premium features are supported on the MD storage array:
  • Snapshot Virtual Disks using multiple point-in-time (PiT) groups
  • Snapshot Virtual Disks (Legacy) using a separate repository for each snapshot
  • NOTE: This section describes the Snapshot Virtual Disk using PiT groups. If you are using the Snapshot Virtual Disk (Legacy) premium feature, see Using The Snapshot (Legacy) Feature.

A snapshot image is a logical image of the content of an associated base virtual disk created at a specific point-in-time, often known as a restore point. This type of image is not directly readable or writable to a host since the snapshot image is used to save data from the base virtual disk only. To allow the host to access a copy of the data in a snapshot image, you must create a snapshot virtual disk. This snapshot virtual disk contains its own repository, which is used to save subsequent modifications made by the host application to the base virtual disk without affecting the referenced snapshot image.


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