Symm virtual provisioning TDAT � thin device pool TDEV � thin data device, which has extents or chunks (allocation unit is 12 tracks, or 768KB) Enabling technologies TDEV, TDAT, and pools IVTOC (VTOC now doesn�t happen when the bin file is loaded, it�s VTOC�ed when it�s written, so there�s a performance impact for this) (will this be like a COFW penalty?) FE-enabled pre-fetch Write Flow TDEV has an allocation table, pointers to physical storage Rather than point directly to a track on the TDAT, it points to a different allocation table at the end of the TDAT. The allocation table (id_tables?) in the TDAT then points to the track group (12 tracks) on the TDAT. Capacity is allocated round robin to all the TDATs. Wide Striping Drives are carved up into TDATs and added to a thin pool. The drives are spread out everywhere across al the DA pairs. Looks like 3PAR chunklets. Spreads workload more evenly across all spindles. No need for Symm Optimizer, not applicable. Some results from lab test...