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Compression, Key management – HP Data Protector Express Basic-Software User Manual

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Hint

The text entered here will be added to the log file of an import job if the media later needs to be

imported and the incorrect passphrase is supplied. Use this field to create a reminder of the passphrase

as Data Protector Express cannot recover a lost passphrase.

Compression

Software encryption disables hardware compression, although you will still be able to select Software

compression.
If the backup device has hardware compression then performance will be better if only hardware

compression is used, and that there is little to no benefit of having both enabled. Enabling software

compression in this circumstance will reduce performance.
If Hardware encryption is selected, we recommend that Enable hardware compression is also selected.

Hardware encryption and hardware compression can be used on devices, such as the HP LTO-4 tape

drive without any loss of backup speed.

Key Management

Data Protector Express has adopted a very simple key management strategy. A media is encrypted

originally by configuring the job that creates it according to the parameters described above. From that

point on, the media is known to the catalog. As long as the media is known, restore jobs may use the

media without entering the passphrase again. If a media is unknown — because it was deleted from the

catalog or because it came from a different catalog — you must import the media to make it known to the

catalog again. The import process required you to supply the passphrase to complete the import. If the

passphrase supplied does not match that used to encrypt the media, then the hint supplied at encryption

time will be shown in the job log so you can try the import again.
When media is encrypted the media is depicted on the Jobs and Media view with a lock on it. The

Platinum colored lock indicates hardware, whereas the gold lock indicates software encryption. The

Media details window shows the type of encryption used.

User’s Guide

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