# Dataset Group Summary

Use the Dataset Group Summary attributes to view information on your data set.

Dataset Group Name: A user-defined name that identifies a group of data set name masks that make up the data set group.

Dataset with Highest MSR: The data set with the slowest MSR (millisecond response time) within the group.

Dataset with Largest Allocation: The data set with largest space allocation within the group.

Dataset with Largest Free Space: The data set with largest amount of unused space within the group.

Dataset with Largest Usage: The name of the data set with largest allocation, maximum highest space allocation, and oldest referenced date within the group, in tracks.

Dataset with Oldest Referenced: The data set with oldest referenced date (read, write, or opened) within the group.

Group Total Average MSR: The total average MSR (millisecond response time) for all the active data sets within the group, in milliseconds. You can enable aggregation for this attribute in Tivoli® Data Warehouse.

Group Total Free Space: The total free space for all the data sets within the group, in tracks. You can enable aggregation for this attribute in Tivoli Data Warehouse.

Group Total I/Os: The total I/Os for all the active data sets within the group. You can enable aggregation for this attribute in Tivoli Data Warehouse.

Group Total Space Allocation: The total allocated space for all the data sets within the group, in tracks. You can enable aggregation for this attribute in Tivoli Data Warehouse.

Group Total Used Space: The total used space for all the data sets within the group, in tracks. You can enable aggregation for this attribute in Tivoli Data Warehouse.

Highest MSR: The highest MSR (millisecond response time) for the identified data set within the group, in milliseconds. You can enable aggregation for this attribute in Tivoli Data Warehouse.

Largest Space Allocation: The space allocation for the identified data set, in tracks. You can enable aggregation for this attribute in Tivoli Data Warehouse.

Largest Space Free: The free space for the identified data set, in tracks. You can enable aggregation for this attribute in Tivoli Data Warehouse.

Largest Space Usage: The largest allocation for the identified data set within the group.

Largest Usage Oldest Reference Date: The reference date for the identified data set within the group.

Managed System: An internal name used to identify the system from which this row of data was obtained.

Oldest Date Referenced: The last referenced date for the identified data set.

Percent Free: The percentage of the group total space allocation not in use. You can enable aggregation for this attribute in Tivoli Data Warehouse.

Percent Used: The percentage of the group total space allocation in use. You can enable aggregation for this attribute in Tivoli Data Warehouse.

Total Datasets: The total number of data sets in this data set group. You can enable aggregation for this attribute in Tivoli Data Warehouse.