HP B6960-96035 Selection of the media set, Selection of devices, Media set selection algorithm

Selection of the media set

If an object version that you want to restore exists on more than one media set, which has been created using one of the Data Protector data duplication methods, any of the media sets can be used for the restore. By default, Data Protector automatically selects the media set that will be used. You can influence the media set selection by specifying the media location priority. You can also manually select the media set you want to use for the restore, except when restoring integration objects.

Media set selection algorithm

By default, Data Protector selects the media set with the best availability and quality. For example, Data Protector avoids media sets with missing media or poor media; it considers the completion status of the objects, the availability and locality of the device to be used with a certain media set, and so on. A media set located in a library is used before one in a standalone device.

Selection of restore chain

If you use synthetic backup, there is often more than one restore chain for the same point in time of an object. By default, Data Protector selects the most convenient restore chain and the most appropriate media within the selected restore chain.

Media location priority

To influence the selection of the media set, specify the media location priority. This is important if you use the concept of multi-site storage. If you keep media at different sites, you can specify which location is preferable for a specific restore. Data Protector will use the media set with the highest priority if more than one media set matches the conditions of the selection algorithm.

You can set the media location priority globally or for a specific restore session.

Selection of devices

By default, Data Protector restores selected data with the same devices that were used during backup. Optionally, you can restore the data with some other devices of the same type. You can also specify what Data Protector should do if the selected devices are not available, for example, if they are disabled or already in use:

•Original device selection:

Data Protector should wait for the devices to become available. This is the preferred option for Data Protector SAP DB/MaxDB, IBM UDB DB2, Microsoft

126 Planning your backup strategy