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Dell PowerVault MD 34XX/38XX Series Storage Arrays CLI Guide

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Snapshot Images And Groups

A snapshot image is a logical image of the content of an associated base virtual disk created at a specific point-in-time, also called 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.
A snapshot image differs from a snapshot (legacy) in the following ways:
  • A snapshot image uses one repository for all snapshot images associated with a base virtual disk, improving performance when there are updates to the base virtual disk.
  • A snapshot image only exists within a snapshot group. To make the snapshot image read/write accessible by hosts, you must create a snapshot virtual disk.

For more information on the Snapshot feature, see the Administrator's Guide.

Only the following can be included in a snapshot image:
  • Standard virtual disks
  • Thin provisioned virtual disks
  • Consistency groups

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