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Indice<br />
1 Introduzione 3<br />
2 Livelli ZFS 4<br />
2.1 Livello Interfaccia . . . . . . . . . . . . . . . . . . . . . . . . . 6<br />
2.2 Livello Oggetti Transazionali . . . . . . . . . . . . . . . . . . 6<br />
2.3 Livello Storage Pool . . . . . . . . . . . . . . . . . . . . . . . 9<br />
3 Astrazione della Memoria 12<br />
3.1 Capacità di Memorizzazione . . . . . . . . . . . . . . . . . . . 12<br />
3.2 Storage Pool . . . . . . . . . . . . . . . . . . . . . . . . . . . 13<br />
4 Gestione dello Spazio 15<br />
4.1 Dimensione Variabile dei Blocchi . . . . . . . . . . . . . . . . 15<br />
4.2 Rappresentazione spazio libero ed occupato . . . . . . . . . . 15<br />
4.3 Allocazione blocchi . . . . . . . . . . . . . . . . . . . . . . . . 16<br />
4.4 <strong>File</strong> Sparsi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17<br />
5 Integrità end-to-end dei dati 17<br />
5.1 Scrittura transazionale copy-on-write . . . . . . . . . . . . . . 18<br />
5.2 Checksumming . . . . . . . . . . . . . . . . . . . . . . . . . . 19<br />
5.3 Data Scrubbing . . . . . . . . . . . . . . . . . . . . . . . . . . 20<br />
5.4 Resilvering . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21<br />
6 Ridondanza Dati 22<br />
6.1 Ditto Blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22<br />
6.2 Raid-Z . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24<br />
6.3 Snapshot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26<br />
6.4 Clone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27<br />
6.5 Deduplicazione . . . . . . . . . . . . . . . . . . . . . . . . . . 28<br />
7 Cenni conclusivi 28<br />
2
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