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ALERT - A160104 - FILE_SERVER_CVM_CONFIG_CHECK


KB ARTICLE PAGE


ALERT - A160104 - FILE_SERVER_CVM_CONFIG_CHECK

Article #000009845

Last modified onApr 17th 2024


SUMMARY:

The NCC health check "file_server_cvm_config_check" verifies whether AOS & Files
Cluster Internal Network are on different subnets.


VERSIONS AFFECTED:

NCC 4.x, All Nutanix Files Versions, ALL AOS Version

NCC
Nutanix Files


DESCRIPTION:

Alert Overview
The NCC health check file_server_cvm_config_check verifies if AOS & Files
Cluster Internal (storage) networks are on different subnets.


Sample Alert

Block Serial Number: 23SMXXXXXXXX
alert_time: Tue Apr 2024 15:05:10 GMT-0800 (PST)
alert_type: File Server
alert_msg: File Server {file_server_name} internal network {nvm_subnet} is not on the same subnet as Controller VM {cvm_ip} subnet {cvm_subnet}
cluster_id: xxxxx
alert_body: No Alert Body Available

 

Output messaging

Check ID160104Description"File Server internal network and Controller VM are in
different Subnet"Causes File Server internal network and the Controller VM are
in different subnets. This may cause performance issues.ResolutionsRe-IP the
file server's internal network is on the same subnet as the Controller VM.
Contact Nutanix support if the issue still persists or assistance
needed.ImpactFile Server performance might have degraded.Alert TitleFile Server
internal network is not on the same subnet as Controller VM.Alert MessageFile
Server {file_server_name} internal network {nvm_subnet} is not on the same
subnet as Controller VM {cvm_ip} subnet {cvm_subnet}


 


SOLUTION:

Troubleshooting 

Confirm the subnet which the Files internal interface has been selected to use
and also check the subnet in use by the CVMs. 
For Files, if you navigate to the File Server page in Prism Element, you can
select the affected Files cluster and click view IPs under "Storage Network" to
the bottom left of the page. 
You can find the IPs of the CVMs by browsing to settings, network configuration,
then selecting the Management LAN under Internal Interfaces. 

Resolving the Issue

When the File Server internal network and the Controller VM's are in different
subnets, it may cause performance issues due to slow IO (iSCSI traffic) which is
dependent on communication between File Server VM internal/Storage network and
CVM. The core reasoning is explained in the Nutanix Files Solution Guide:

Nutanix recommends placing the FSVM storage interface on the same network VLAN as the Nutanix CVM management interface (eth0 of the CVM). 
Using the same VLAN helps ensure maximum performance for ISCSI sessions.

The Procedure to update a File Server Network is documented in the Nutanix Files
Guide.
For your reference, the Nutanix Files Guide section to update your network is
available here. If you need more help, consider engaging Nutanix Support.

Running the NCC Check
You can run the following checks as part of the full NCC Health Checks:

nutanix@CVM$ ncc health_checks run_all

Or you can run the check separately:

nutanix@CVM$ ncc health_checks fileserver_checks fileserver_cvm_checks file_server_cvm_config_check

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 24 hours, by default.
 * This check will generate a WARN alert.