HP Data Protector Software Performance White Paper

Cyclic redundancy check (CRC)

Cyclic redundancy checking (CRC) is an enhanced checksum function. When this option is

selected, CRC checksums are written to the media during backup. CRC checks allow you to

verify the media after the backup. Data Protector re-calculates the CRC during a restore and

compares it to the CRC on the medium. It is also used while verifying and copying the media.

This option can be specified for backup, object copy, and object consolidation operations. The

default value is OFF.

Figure 49 shows the default configuration parameters for Ultrium tape drives. CRC checking

was OFF.

Figure 49. HP StorageWorks Ultrium 960 advanced options – CRC checking OFF