You can monitor the capacity of the vSAN datastore, deduplication and compression efficiency, and a breakdown of capacity use.

The vSphere Web Client cluster Summary tab includes a summary of vSAN capacity. You also can view more detailed information in the Capacity monitor.


  1. Navigate to the vSAN cluster in the vSphere Web Client.
  2. Click the Monitor tab and click vSAN.
  3. Select Capacity to view vSAN capacity information.


The Capacity Overview displays the storage capacity of the vSAN datastore, including used space and free space. The Used Capacity Breakdown displays the percentage of capacity used by different object types or data types. If you select Data types, vSAN displays the percentage of capacity used by primary VM data, vSAN overhead, and temporary overhead. If you select Object types, vSAN displays the percentage of capacity used by the following object types:

  • Virtual disks

  • VM home objects

  • Swap objects

  • Performance management objects

  • .vmem files

  • File system overhead

  • Checksum overhead

  • Snapshot memory

  • Deduplication and compression overhead

  • Space under deduplication engine consideration

  • iSCSI home and target objects, and iSCSI LUNs

  • Other, such as user-created files, VM templates, and so on

If you enable deduplication and compression on the cluster, the Deduplication and Compression Overview displays capacity information related to that feature. When you enable deduplication and compression, it might take several minutes for capacity updates to be reflected in the Capacity monitor, as disk space is reclaimed and reallocated. For more information about deduplication and compression, see Using Deduplication and Compression.