Identifying datasets with excess space

Use dataset groups to identify datasets with extra allocated space. If DFSMS Data and Storage Class ACS routines are not configured for space restrictions or release unused primary space, the total space is in excess of the specified threshold.

Before you begin

To monitor for this condition, perform the following steps:
  • Create a group of datasets.
  • Create a threshold to monitor the Largest Free Space for those datasets.
  • After you have isolated a group of datasets, it is possible to analyze individual datasets.
    Note: You can also use the Dataset Attribute Summary workspace to monitor space usage on a system-wide basis if the group orientation does not provide sufficient scope for your storage management activities.

About this task

To set up this threshold, perform the following steps:

Procedure

  1. In Figure 2, right-click anywhere within the Dataset Group Summary table, click Properties to open the Properties editor.
  2. Click the Thresholds tab.
  3. Select the Largest Space Free attribute and change the operator in the first row to Greater than (>) and the value to 1000 or a reasonable value for your system. Check that the indicator is set to critical.
  4. Repeat the process on the second and third line to set a threshold that indicates an acceptable warning and informational level.
  5. Click Apply and OK.

    Whenever the Largest Free Space value for the dataset group exceeds the specified thresholds, that group is highlighted in the table view. You can analyze the resulting list of datasets and take appropriate action.