Datastores. Overprovisioned Storage

This report helps you detect datastores for which the amount of provisioned storage space exceeds datastore capacity.


Thin provisioning allows administrators to allocate for virtual machines more storage space than there is real physical capacity. The Datastores. Overprovisioned Storage report helps you reveal excessive storage over-provisioning in your virtual environment.


Date/time Selection: defines the time period to analyze in the report.

Show details: defines how data will be sorted in the report tables. If you want to report on overprovisioned datastores, select Highest Disk Pressure. If you want to report on overprovisioned datastores which are about to run out of free space and affect VM performance, select Least Free Space.

Data Aggregation: defines whether data in the report will be aggregated to Hourly or Daily values.

Scope: defines a list of Groups or Objects that will be analyzed in the report (by default, the VMware Datastores group is selected). The Add Group option returns a Group and all objects that a group contains. The Add Object option returns only the selected object.

Sample Usage

Report on datastores with the largest amount of over-provisioned storage space. Use statistics for the previous month as a ground for the report analysis.


  1. Open the Datastores. Overprovisioned Storage report.
  2. From the From list, select Previous month > First day. From the To list, select Previous month > Last day.
  3. From the Show details list, select Highest Disk Pressure.
  4. From the Data Aggregation list, select Daily.
  5. Leave the Scope section without changes.
  6. Click Run to view the report.

Report Output

The TOP 5 Over-provisioned Datastores (GB) chart will show 5 most over-provisioned datastores, and graphically display the difference between the datastore capacity, provisioned and used space.

The TOP 10 Over-allocated by Storage VMs chart will show 10 VMs with excessive amount of allocated space, and graphically display the difference between allocated used and unused space.

For each datastore, details tables will provide information on the number of VMs residing on the datastore, free and provisioned space, capacity, disk pressure and the percentage of provisioned space that is actually used.

You can click a number in the VMs column of a details table to drill down to performance charts and statistics on storage space usage.