This section provides notes on snapshot backup operation.
Number of Required Backup Volumes
Snapshot high-speed backup requires as many backup volumes as the number of specified backup generations. Accordingly, snapshot backup is disabled if:
All the specified number of generations have been backed up, and
There is no new volume that can be used as a backup volume.
Simultaneous Backups
Performing snapshot high-speed backup simultaneously with the same transaction volume specified will perform two backups in parallel.
However, performing snapshot high-speed backup simultaneously more often than the number of preservation generations will cancel the backup operations starting from the oldest one. In other words, you cannot perform more simultaneous backups than the specified number of generations.
SDX Object Backup Operation
If the transaction volume is an SDX object, the backup operation may encounter a hardware problem. In this case, change the backup operation as follows:
Start the GUI client. For more information, see "4.4.3 Starting the GUI client".
Fetch all the device information from the storage server whose backup operation you wish to change. When you fetch device information, the system will detect a device with the same name as an SDX object whose backup operation can no longer be continued. Move the device to the [Additional instruction device] field. For information on fetching device information, see "4.4.5 Fetching device information on a Storage Server". At this time, do not delete the original SDX object that is displayed in the [Device not detected] field.
Set the added SDX object as a transaction volume. For more information, see 4.4.7 Setting the operation type for a device.
Set a backup policy for the added SDX object. For more information, see 4.4.8 Setting backup policies.
After specifying the added SDX object, perform the backup.
