# Dataset Group Properties dialog box

You use this dialog box to define a group of data sets based on filtering rules (masks) and related properties.

You access this dialog box through the Dataset Group Summary workspace, which is described in Monitoring dataset groups. The settings to modify are as follows:

- Mask. You type a mask definition following the rules used by DFDSS data set name masking. For detailed information, see the IBM® Tivoli OMEGAMON® XE for Storage on z/OS®: User's Guide.
- Active. Select this checkbox to cause data collection from the catalog to be performed for the data sets that fall under a mask.
- Space Data. Select this checkbox to collect space data for the data sets that fall under a mask.

To learn more about creating and using data set groups see the IBM Tivoli OMEGAMON XE for Storage on z/OS: User's Guide.