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Dell NetWorker 19.9 Administration Guide

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Converting sparse files to fully allocated files

The NetWorker server determines which files are sparse by comparing the allocated blocks with the byte size. If the allocated blocks do not account for the size of the file, NetWorker considers the file as sparse and the save operation replaces long strings of zeros with “holes” in the recovered file.

A recovery operation may recover some files as sparse when the files were not sparse at the time of the backup operation. Oracle databases are susceptible to this problem because they are zero-filled, fully allocated files, but are not sparse.

To workaround this issue, use the cp command to copy the file after recovery:

cp recovered_filename zero_filled_filename

This command converts a sparse file to a fully allocated file.

NOTE:Ensure that you have enough free disk space to accommodate a duplicate of each copied sparse file.

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