vSAN Health Check Overview

The vSAN Health Check is a built-in feature that delivers a simplified troubleshooting and monitoring experience of all things vSAN, it examines all aspects of a vSAN configuration, and reports on any issues or failures. It should be the starting point for any troubleshooting activity and most monitoring activities.

vSAN Health Checks

Hardware Compatibility:  Ensure that the components being used are supported. This includes the hardware, software, and drivers.

Performance Service: Check the health of the performance service.

Network: Check vSAN Network Health, ensuring that each host in the vSAN cluster has a VMkernel interface configured for vSAN traffic, being able to ping successfully between all hosts on the vSAN network interface. It also checks for network partitioning. 

Physical disk: Monitor the health of physical disks in the vSAN cluster, which include disk surface issues, controller issues, driver issues, metadata health, congestion, issues with the I/O stack.

Data: Check that all of the objects deployed on the vSAN datastore are healthy.

Cluster: Monitor your vSAN cluster health, which include checking that the health check service is installed across all the hosts in the cluster and verifies that all hosts are running with an up-to-date version. The cluster health check also monitor CLOMD live-ness. CLOM is responsible for creating, repairing, and migrating objects, and is critical for handling various workflows and failure handling in vSAN.

Limits: Monitor vSAN cluster limits. Which include component limits, disk space utilisation, read cache reservation and the impact of a host failure on the limits in the cluster.

Online health: Monitor the vSAN cluster health and send to VMware’s masked  analytics for advanced analysis. You must participate in CEIP to use the online health checks.

vSAN iSCSI target service: Monitor the iSCSI target service, if applicable.

Encryption: Monitor vSAN encryption health, if applicable.

Stretched cluster: Monitor the health of a stretched cluster, if applicable.


  • You can click the Ask VMware button to open a knowledge base article that describes the health check and provides information about how to resolve the issue.
  • vSAN periodically retests each health check and updates the results. To run the health checks and update the results immediately, click the Retest button.

I hope this post was helpful. Thank you for reading.

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My name is Amine El Badaoui and I currently live in Aylesbury, a small town in the south east of England

I have been working in the IT industry for few years now and specialise in VMware virtualisation, data centre infrastructure and cloud technologies. Over the years I have obtained numerous industry certifications from Microsoft, Netapp and VMware.I currently work as a VMware Product Engineer @ https://www.rackspace.com/

This blog represents my random technical notes and thoughts. The thoughts expressed here do not reflect my current employer in anyway.

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