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US PATENT DOCUMENTS tures, Within that vvbn space. Notably, the block allocation structures of a vvol are siZed to the vvol, and not to the underlying aggregate, to thereby alloW operations that man age data served by the storage system (eg, snapshot opera tions) to e? iciently Work over the vvols. The? le system layout extends the? le system layout of a conventional Write anyWhere? le layout system implementation, yet maintains performance properties of the conventional implementation.