You must follow certain guidelines when creating SnapVault relationships.
The following guidelines apply to all SnapVault relationships:
A volume can be the primary for multiple secondaries and also the secondary for another primary.
For example, if you want to back up an entire Storage Virtual Machine (SVM) to a SnapVault backup, then you must create a separate secondary volume for each volume in the SVM, and create a separate SnapVault relationship for each primary volume.
The relationship will work, but the efficiency provided by FlexClone volumes is not preserved.
If you rename a primary volume, it can take a few minutes for the relationship to recover from the name change.
Typically, you create a prepopulated secondary volume when you copy a primary volume to a secondary volume using tape. This process is known as tape seeding.
If the SnapVault secondary volume already contains data, you can create a SnapVault relationship by using the snapmirror resync command with the -type XDP option.
Before creating a SnapVault relationship to a prepopulated secondary, you must use the following guidelines:
When a SnapVault relationship is created, all Snapshot copies on the secondary volume that are more recent than the common Snapshot copy and that are not present on the primary volume are deleted. Newer Snapshot copies on the primary volume that match the configured SnapVault policy are transferred to the secondary volume according to the SnapVault policy.
You can use the -preserve option to keep any Snapshot copies that are more recent than the common Snapshot copy on the SnapVault secondary volume and that are not present on the primary volume.
When you use the -preserve option, data on the secondary volume is logically made the same as the common Snapshot copy. All newer Snapshot copies on the primary volume that match the SnapVault policy are transferred to the secondary volume.
This option is useful when the latest common Snapshot copy is deleted from the primary volume but another, older common Snapshot copy between the primary and secondary volumes still exists.