Secondary backups from Veritas NetBackup, MP3 risk data loss

If so, you run the risk for data loss if you have multi-fragment non-multiplexed, duplicated images. According to Veritas, this can be a serious problem if the original backup copy is set to expire quickly and a restore has to be made from a copy of the copy.

This situation commonly occurs with Virtual Tape Libraries (VTLs), where the original copy is sent to the VTL and the information is quickly copied from the VTL's longer-term storage.

The problem exists if:

If you make additional copies of the backup images using the "duplicate" operation in

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NetBackup, the images will be written incorrectly and any restores made from these copies will show some data loss. The affected files are the ones that cross fragment boundaries in the image.

Veritas officials point out that the problem does not affect disk-based backups at all or the original backup copy written to tape. If you have the original backup on tape, you can restore successfully from that.

The problem is specific to the bptm daemon in Maintenance Pack 3 and is fixed in Maintenance Pack 3a, which Veritas released last year.

More information from SearchWinSystems.com

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