HP Storage Mirroring Software - Manual (Page 125)

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Use Checksum on All blocks of data during a Difference Mirror—This option allows a file
difference mirror to check each block of data, regardless of the file attributes. If this option is not
marked, Storage Mirroring will assume files are synchronized if their attributes match.
NOTE: Database applications may update files without changing the date, time, or file size.
Therefore, if you are using database applications, you should use the Block Checksum
All option to ensure proper file comparisons.