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Home > Storage > PowerMax and VMAX > Storage Admin > Dell PowerMax: Data Reduction > Storage Group
For application workloads to achieve capacity savings from data reduction it must be enabled at the storage group level. This is supported with Unisphere and Solutions Enabler. The feature is enabled by default when creating storage groups. There are two I/O flows for incoming data, data reduction enabled, where data is sent through the data reduction hardware and reduced, or data reduction disabled in which data bypasses the data reduction hardware and is written to disk unreduced. The storage group data reduction setting determines which I/O path the data will follow. In both cases, setting enabled or disabled is done using the data reduction option when provisioning storage. The option to enable or disable data reduction for individual storage groups can be changed at any time. However, changing the setting simply informs the system which I/O path the data will follow. Changing the setting does not immediately inflate already reduced data or attempt to reduce data already consuming capacity.