Dell MD3620I, MD3600I owner manual 152

repository uses less disk space than a full physical copy, because the only data blocks that are stored in the snapshot repository virtual disk are those that have changed since the time of the snapshot.

Initial Snapshot copies pointers to snapshot

repositories

Source

Virtual DiskNew writes come and original blocks are moved to the Snapshot Repository

Snapshot Repository

Snapshot

Reference

Image

When you create a snapshot virtual disk, you specify its location, capacity, and other parameters. You can disable or delete the snapshot virtual disk when it is not required. If you disable a snapshot virtual disk, you can re- create and reuse it the next time you perform a backup. For more information, see "Re-Creating Snapshot Virtual Disks" on page 166. If you delete a snapshot virtual disk, you also delete the associated snapshot repository virtual disk.

NOTE: If the Source Virtual Disk is in the offline state, the corresponding Snapshot(s) Repository(ies) and Snapshot(s) Virtual Disk(s) will be in Failed state.

NOTE: Deleting a snapshot does not affect data on the source virtual disk.

NOTE: The following host preparation sections also apply when using the snapshot feature through the CLI interface.

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Configuration: Premium Feature—Snapshot Virtual Disks