### Human: Can you tell about NCC Health Check: cluster_services_down_check. ### Assistant: The NCC health check cluster_services_down_check verifies if the cluster services are running on all Controller VMs in the cluster. If any cluster service is not running on any of the Controller VMs in the cluster, this check fails.. The NCC health check cluster_services_down_check verifies if the cluster services are running on all Controller VMs in the cluster. If any cluster service is not running on any of the Controller VMs in the cluster, this check fails.

Running the NCC CheckYou can run this check as part of the complete NCC Health Checks:

nutanix@cvm$ ncc health_checks run_all

Or you can run this check separately:

nutanix@cvm$ ncc health_checks run_all

You can also run the checks from the Prism web console Health page: select Actions > Run Checks. Select All checks and click Run.

This check is scheduled to run every minute, by default.

Sample outputFor status: PASS

nutanix@cvm$ ncc health_checks run_all

For status: FAIL

nutanix@cvm$ ncc health_checks run_all

For PC (Prism Central) ClusterThis check verifies whether all services are running on PC VM.

Note: If the Cluster Health service status is DOWN for more than 15 minutes, an alert email is sent by the AOS cluster to configured addresses and Nutanix Support (if selected). In this case, no alert is generated in the Prism web console. The email is sent once per 24 hours. You can run the NCC check cluster_services_down_check to see the service status.

Output messaging

Check ID3032DescriptionCheck that no services are down in the cluster.Causes of failureOne or more services in the cluster are down.ResolutionsIf this check occurs once or infrequently, no action is necessary.ImpactCluster performance may be significantly degraded. In the case of multiple services with the same condition, the cluster may become unable to serve I/O requests.Alert IDA3032Alert TitleCluster services are downAlert Smart TitleCluster services down on Controller VM ip_addressAlert MessageCluster Service: service_name is down on the Controller VM ip_address.. Run the following command to confirm if any service is currently down:

nutanix@cvm$ cluster status | grep -v UP

If any services are listed as DOWN, start those services by using the following command:

nutanix@cvm$ cluster status | grep -v UP

If there are issues starting some services, check the following:


	Check if the node is in maintenance mode by running the ncli host ls command on the CVM. Verify if the parameter Under Maintenance Mode is set to False for the node where the services are down. If the parameter Under Maintenance Mode is set to True, remove the node from maintenance mode by running the following command:

	nutanix@cvm$ cluster status | grep -v UP

	You can determine the host ID by using ncli host ls.
	
	See the troubleshooting topics related to failed cluster services in the Advanced Administration Guide available from the Nutanix Portal's Software Documentation page. (Use the filters to search for the guide for your AOS version). These topics have information about common and AOS-specific logs, such as Stargate, Cassandra, and other modules.
	
	Check for any latest FATALs for the service that is down. The following command prints all the FATALs for a CVM. Run this command on all CVMs.

	nutanix@cvm$ cluster status | grep -v UP
	

If a service does not start, or if you see FATAL logs for the service that is down, collect the logs and contact Nutanix Support for assistance.
Collect logbay bundle for the timestamp when the alert was noticed. For more information on logbay, see KB 6691.

For PC VM

Check if any services are down using the below command:

	nutanix@cvm$ cluster status | grep -v UP
	If any service is listed as DOWN, start that service using the below command:
	nutanix@cvm$ cluster status | grep -v UP
	Verify if all services are running using the command provided in step 1.

If the above commands do not help and you still see a service reported as DOWN, open a case to engage Nutanix Support at https://portal.nutanix.com/.
Collect logbay bundle for the timestamp when the alert was noticed. For more information on logbay, see KB 6691.. ### Human: Now explain this as a Nutanix support agent summarizing the answer step by step. In case, you don't know the answer say - I don't know.