HP B6960-96035 User Manual download pdf (Page 150)

concurrently written in sess_7 and the second one in sess_8. Note that one object

can be stretched over several media. The media usage policy is appendable.

Figure 44 Each object written on a separate medium

Figure 44 on page 150 shows an example of using one backup specification per

object with the non-appendable media usage policy. The result is higher media

consumption. You could combine this with the append incrementals only policy, to

get the incremental backups of the object on the same medium.

For more information on how full and incremental backup policies influence restore

performance and media usage, see “Full and incremental backups” on page 71.

Writing data to several media sets during backup

During a backup session, you can write all or some objects to several media sets

simultaneously, using the Data Protector object mirror functionality. For more

information, see “Object mirroring” on page 119.

Calculating media condition

Media condition factors

Data Protector calculates the state of used media using media condition factors. The

state of the poorest medium in a pool determines the state of the entire pool. For

example, as soon as the state of one medium in a media pool is poor, the state of

the pool becomes poor. When that particular medium is removed from the pool, the

state reverts to either fair or good.

Media can have three states: good, fair, or poor.

On a per medium basis, the following is used for calculating the condition:

• number of overwrites

The usage of a medium is defined as the number of overwrites from the beginning

of the medium. Once the medium has more than the threshold number of

overwrites, it is marked as poor

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HP B6960-96035 User Manual Page 150