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Snapshot Repository sizing
A new feature of firmware 07.83.xx.xx are Point-in-Time Snapshots. These provide the ability to roll back
snapshots to earlier point-in-time saves and optimize the data changes between snapshot images. This
feature utilizes two separate repositories to facilitate tracking of changes to the base volume. They are
the Snapshot Group repository and Snapshot Volume repository.
Snapshot Group repository
The Snapshot Group repository is used to track data changes to the base volume (volume that the
Snapshot Image was created from). The Snapshot Group repository may contain multiple Snapshot
Images (point-in-time records of base volume). A Snapshot Volume is created from these images and can
then be mapped to a host for access.
Figure 10. Modular Disk Storage Manager (MDSM) Snapshot Group View
Snapshot Volume repository
The Snapshot Volume repository is used to track data changes to the Snapshot Volume, if read/write
access is allowed. After a Snapshot Volume is mapped to a host for access, any changes to the volume
are tracked within this repository.
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