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

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Snapshot Groups

The purpose of a snapshot group is to create a sequence of snapshot images on a given base virtual disk without impacting performance. You can set up a schedule for a snapshot group to automatically create a snapshot image at a specific time in the future or on a regular basis.
The following rules apply when creating a snapshot group:
  • Snapshot groups can be created with or without snapshot images.
  • Each snapshot image is a member of only one snapshot group.
  • Standard virtual disks and thin virtual disks are the only types of virtual disks that can contain a snapshot group. Snapshot virtual disks cannot contain snapshot groups.
  • The base virtual disk of a snapshot group can reside on either a disk group or a disk pool.
  • Snapshot virtual disks and snapshot groups cannot exist on the same base virtual disk.
  • A snapshot group uses a repository to save all data for the snapshot images contained in the group. A snapshot image operation uses less disk space than a full physical copy because the data stored in the repository is only the data that has changed since the latest snapshot image.
  • A snapshot group is initially created with one repository virtual disk. The repository contains a small amount of data, which increases over time with subsequent data updates. You can increase the size of the repository by either increasing the capacity of the repository or adding virtual disks to the repository.

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