To reduce disk fragmentation, space is always allocated for the first backup of a given session in 1 GB increments, until the session ends. If four streams are writing, each stream uses a pre-allocated chunk of disk space.
L'ultimo blocco di dati di 1 GB viene arrotondato per difetto in modo che il file di dati occupi le dimensioni effettive della sessione compressa al termine del processo di deduplicazione. Questo approccio fa sì che il disco venga frammentato in blocchi di 1 GB.
This is done only for backups to deduplication devices and only for the first backup of one root directory on one device.
For second backup and subsequent jobs, the amount of data physically written to disk is expected to be low.
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