Users Guide

4
Snapshot repository sizing
Point-in-time snapshots provide the ability to roll back virtual disks to previous point-in-time saves, and optimize the data changes
between snapshot images. This feature utilizes two separate repositories, the Snapshot Group repository and Snapshot Virtual Disk
repository, to facilitate tracking of changes to the base virtual disk.
Snapshot Group repository
The Snapshot Group repository is used to track data changes to the base virtual disk; the virtual disk from which the Snapshot
Image was created. The Snapshot Group repository may contain multiple Snapshot Images (point-in-time records of base virtual
disk). A Snapshot virtual disk is created from these images and you can map them to a host for access.
Figure 3. MD Storage Manager Snapshot Group View
Snapshot Virtual Disk repository
The Snapshot Virtual Disk repository is used to track data changes to the Snapshot Virtual Disk, if read/write access is allowed. After
you map a Snapshot Virtual Disk to a host for access, any changes to the virtual disk are tracked within this repository.
7