Dell NetWorker 19.9 Administration Guide

Auto media verification

If the Auto Media Verify attribute is enabled, the NetWorker server verifies data written to tape volumes from this media pool. This attribute does not apply to AFTD, file type and Data Domain devices.

Data is verified by repositioning the tape volume to read a portion of the data previously written to the media. The data read is compared to the original data written. This feature does not verify the entire length of the tape.

If the data read matches the data written, verification succeeds.

Media is verified when the following occurs:

• A volume becomes full while saving and it becomes necessary to continue on to another volume.
• A volume goes idle because all save sets being written to the volume are complete.

When a volume fails verification, it is marked full so that the server will not select that volume for future saves. The volume remains full until it is recycled or a user marks it not full. If a volume fails verification while the server is attempting to switch volumes, all save sets writing to the volume are terminated.

Auto media verification should not be used to verify the integrity of the data written to the entire tape. To fully verify the data written to the tape, either restore the tape contents or clone the data.