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vSAN space reporting feature overview (2144399)

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Purpose

This article describes the vSAN space reporting feature and the space usage data definitions shown in space reporting.

Resolution

Q: What does the space reporting feature do?
A: vSAN space reporting is enabled by default in vSAN 6.2 and later releases. 
Using the vSAN space, you can view these information:
  • General vSAN space usage.
  • Detailed space usage breakdown that indicates the total amount of used and free space that is available.
  • The purpose for which the space is used.
vSAN space reporting is enabled by default in vSAN 6.2 and later releases. It displays general vSAN space usage,  displays a detailed space usage breakdown that indicates the total amount of used and free space that is available, and the purpose for which the space is used.

Q: What is the meaning of each reported data value shown in the space reporting view?
A: The space reporting page includes three portals:
  • capacity overview portal
  • capacity breakdown portal
  • deduplication and compression overview ports
The space usage data definition in the capacity overview portal are listed here.

Capacity Overview

  • Provisioning: Logical capacity configured for all objects on the cluster
  • Used - Physically Written: Capacity storing actual data of the objects on the vSAN datastore
  • Used - VM Over-reserved: Space wasted due to higher than needed space reservation setting. Reducing object space reservation policy can free up space without the need to delete or move any data
  • Used - Total: Space not available for new allocations
  • Used - vSAN system overhead: Capacity consumed by vSAN for system needs.

Used Capacity Breakdown

There are two types of capacity breakdown, by object types and by data types. 

Object type breakdown

  • Virtual disks: The total space used for all of virtual disks
  • VM home objects: The total space used for the VM home directory
  • Performance management object: The total space used for vSAN performance service
  • Vmem: The total space used for the virtual memory for all VMs
  • File system overhead: The vSAN file system overhead
  • Checksum overhead: The space required for checksum metadata overhead
  • The deduplication and compression overhead: The metadata overhead required for deduplication and compression
  • The snapshot memory: The total space used for the snapshot memory
  • Other: Any other used space such as the user created file or the VM template in the vSAN datastore

Data type breakdown

  • Primary VM data: The total space used for primary VM data. This is user used data in VM/VMDK
  • vSAN overhead: The total of all kinds of vSAN overhead including replica, witness, RAID 5/6 component and so on
  • The temporary overhead. The space used when moving objects

Deduplication and compression overview

  • Used space before: The total used space before enabling deduplication and compression
  • Used space after: The total used space after enabling deduplication and compression
  • Saving: The total space savings achieved by enabling deduplication and compression

See Also

Request a Product Feature

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