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Dell EMC PowerVault MD 34XX/38XX Series Storage Arrays Administrator's Guide

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Snapshot Virtual Disk read/write properties

A snapshot virtual disk can be designated as either read-only or read-write.
The following are the differences between the two:
  • Read-Only snapshot virtual disks provide the host read access to a copy of the data contained in the snapshot image. However, the host cannot modify the snapshot image. A Read-Only snapshot virtual disk does require an associated repository.
  • Read-Write snapshot virtual disks require an associated repository to provide the host write access to a copy of the data contained in the snapshot image. A Read-Write snapshot virtual disk requires its own repository to save any subsequent modifications made by the host application to the base virtual disk without affecting the referenced snapshot image. The snapshot is allocated from the storage pool from which the original snapshot image is allocated. All I/O writes to the snapshot image are redirected to the snapshot virtual disk repository that was allocated for saving data modifications. The data of the original snapshot image remains unchanged. For more information, see Understanding Snapshot Repositories.

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