rghosh8/supportGPT_data huggingface dataset:
### Human: Can you tell about Root Cause Analysis of CVM Reboots. ### Assistant: This article describes how to troubleshoot and perform root cause analysis when a CVM (Controller VM) suddenly reboots.. This article describes how to troubleshoot and perform root cause analysis when a CVM (Controller VM) suddenly reboots.

Logs to look for inside the CVM:

dmesg

Logs to look for on AHV host: 

dmesg

Logs to look for inside the ESXi:

dmesg

To review memory/cpu usage/disk latency of the CVM at the time of the reboot, the sysstats under /home/nutanix/data/logs/sysstats logs can be reviewed. Note that the logs are in UTC timestamp.

dmesg. Examples


	CVM command last reboot:

	nutanix@cvm$ last reboot
	
	Logs on CVM /var/log/messages and kern.log:

	nutanix@cvm$ last reboot
	
	ESXi logs /vmfs/volumes/xxxxxxxx-xxxxxxxx-xxxx-xxxxxxxxxxxx/ServiceVM*/vmware.log:

	nutanix@cvm$ last reboot

	"Restart Guest OS" on CVM initiated from vCentre results in the following signature in the cvm's vmware.log	(Note that this entry does not occur in the vmware.log if the CVM has been gracefully restarted from within the Nutanix Cluster via AOS Upgrade or cvm_shutdown command)

	nutanix@cvm$ last reboot
	"Shutdown Guest OS" on CVM initiated from vCentre results in the following signature in the cvm's vmware.log	(Note that this entry does not occur in the vmware.log if the CVM has been gracefully shutdown from within the Nutanix Cluster via AOS Upgrade or cvm_shutdown command)
	nutanix@cvm$ last reboot
		Another example of vmware.log (based on VMware bug nr. 676321):
	nutanix@cvm$ last reboot

	Another vmware.log (EPT misconfiguration - VMware KB 1036775):

	nutanix@cvm$ last reboot
	
	ESXi logs /vmfs/volumes/xxxxxxxx-xxxxxxxx-xxxx-xxxxxxxxxxxx/ServiceVM*/ServiceVM.out.0 shows jbd2/fio driver issue in this example:

	nutanix@cvm$ last reboot
	
	For any recent hard drive failure, check hades.out log.

	If the SSD is the metadata drive, AOS will force a CVM to reboot. Also, if AOS has trouble removing an HDD and a forced removal is triggered by hades, a CVM will reboot.

	The output of ServiceVM.out.0 (Bug 735768):

	nutanix@cvm$ last reboot

	ESXi vmksummary to see if the ESXi host rebooted:

	nutanix@cvm$ last reboot

	AHV:

	nutanix@cvm$ last reboot

	CVM:

	nutanix@cvm$ last reboot

	Scroll a few lines above to have more information:

	nutanix@cvm$ last reboot
	

For newer versions of CVM, you may have to grep for "rsyslogd.*start" rather than "kmsg started":

nutanix@cvm$ last reboot. ### 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.
### Human: Can you tell about NCC Health Check: nic_model_hypervisor_check. ### Assistant: The NCC health check nic_model_hypervisor_check checks if the specific NIC model is present on a Hyper-V 2019 cluster and not compatible with Hyper-V 2022.. The NCC health check nic_model_hypervisor_check checks if any of the below NIC cards are present on a Hyper-V 2019 cluster and is not compatible with Hyper-V 2022:

Intel 82599 chipset NIC modelIntel X540 chipset NIC modelIntel I350 chipset NIC model

Customers running Hyper-V 2019 with the above NIC models cannot upgrade to Hyper-V 2022 and above as Hyper-V 2022 is not compatible with these NIC models.

Running the NCC health check:

You can run the check as part of the complete NCC check from the command line by running:

nutanix@cvm$ ncc health_checks run_all

Or individually as:

nutanix@cvm$ ncc health_checks run_all

This NCC check is not scheduled to run automatically after a certain interval. This check would be available as a part of the Hyper-V 1-click upgrade pre-check.

Sample Output:

For status: PASS

The check returns a PASS when the specific NIC cards (82599/X540/i350) are not present on a Hyper-V 2019 cluster.

nutanix@cvm$ ncc health_checks run_all

For status: FAIL

The check returns a FAIL when a specific NIC card (82599/X540/i350) is present on the cluster that runs Hyper-V 2019. The output message may vary in NCC versions.

nutanix@cvm$ ncc health_checks run_all

nutanix@cvm$ ncc health_checks run_all

Output messaging:

Check ID106040DescriptionCheck that there should not be any EOL card connectedCauses of failureNIC card is found which is EOL from Hyper-V 2022.ResolutionsReview KB 13079.ImpactNode Failure on Hyperv2022
Note : This hardware related check executes on the below hardware 
Nutanix NXDell XCHPE. Hyper-V 2022 is not compatible with the NIC models shown in the NCC check failure.

The unsupported NIC model needs to be replaced prior to the upgrade, or remain disconnected before and after the upgrade to Hyper-V 2022. Hyper-V 2019 supports the NIC card.

In case of any queries, kindly contact Nutanix Support.. ### 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.
### Human: Can you tell about Enable Microservices Platform precheck fails on Prism Central after LCM upgrade to 2.5 or later. ### Assistant: Enable Microservices Platform on Prism Central precheck fails after LCM upgrade to 2.5.. After the LCM upgrade to version 2.5 or later in Prism Central, it is impossible to enable Microservices Infrastructure due to network reachability precheck failure, even if the required URL is reachable.Identification:

Enable button on the Prism Central Management page in Prism Central Settings is greyed out and not clickable due to precheck failure.		Click here for more details" link shows the following message:	List the MSP controller and also check the health of the controller. Both will have errors:
	nutanix@PCVM:~$ mspctl cluster list
	Also, ncc health_checks system_checks microservice_infrastructure_status_check should come up with the below WARN

	nutanix@PCVM:~$ mspctl cluster list
	/home/nutanix/data/logs/genesis.out logs on PrismCentral show CONNECTION_ERROR due to "[Errno 20] Not a directory" for HTTPS URLs in test_connectivity_to_external_portals:
	nutanix@PCVM:~$ mspctl cluster list
	Below URLs are confirmed to be reachable and responding with valid HTTP codes if checked via curl from Prism Central. Any valid HTTP response code, including 4xx confirms that the URL is reachable in this case:
	nutanix@PCVM:~$ mspctl cluster list
	. The issue is fixed in pc.2023.1.0.1. Upgrade your Prism Central to pc.2023.1.0.1 or later.Workaround for PC earlier than pc.2023.1.0.1As a workaround, disabling HTTPS in the LCM Settings page should allow CMSP to be enabled in Prism Central Management.. ### 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.
### Human: Can you tell about How to check ACLI and NCLI command history. ### Assistant: This article describes how to access the ACLI and NCLI command history. ACLI is a command line utility that can be used to create/modify/manage VMs on AHV.

NCLI is a command line utility that can be used to manage almost all cluster operations.

It may be helpful to determine what commands were run previously to troubleshoot a current issue.

This article describes how to access the ACLI and NCLI command history.. ACLI History

The ACLI command history is stored in the file /home/nutanix/.acli_history.
Notes:

This file is a hidden file.This file is persistent across reboots of the CVM.This file is available only on CVMs hosted on AHV. It is not available on CVMs running on ESXi or Hyper-V.

To view the file, use the cat command. For example:

nutanix@cvm$ cat /home/nutanix/.acli_history

nutanix@cvm$ cat /home/nutanix/.acli_history

NCLI History

The NCLI command history is stored in the file /home/nutanix/.nutanix_history.
Notes:

This file is a hidden file.This file is persistent across reboots of the CVM.

To view the file, use the cat command. For example:

nutanix@cvm$ cat /home/nutanix/.acli_history

nutanix@cvm$ cat /home/nutanix/.acli_history

BASH History

In addition to the files above, all ACLI and NCLI commands that were directly run from bash are also logged to the file /home/nutanix/.bash_history. Again, use the cat command to view its contents:

nutanix@cvm$ cat /home/nutanix/.acli_history

nutanix@cvm$ cat /home/nutanix/.acli_history

More useful commands

Display last 10 lines of a file:

nutanix@cvm$ cat /home/nutanix/.acli_history

Display last 20 lines of a file:

nutanix@cvm$ cat /home/nutanix/.acli_history

Display first 20 lines of a file:

nutanix@cvm$ cat /home/nutanix/.acli_history

Display lines with ncli in them:

nutanix@cvm$ cat /home/nutanix/.acli_history

Display last 10 lines with ncli in them:

nutanix@cvm$ cat /home/nutanix/.acli_history. ### 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.
### Human: Can you tell about Importing VHDX 4k logical disk alignment is not supported on AHV. ### Assistant: VHDX images with 4k logical alignment either uploaded via Prism or imported via Move will fail with Assertion.. Importing VHDX with a 4k logical disk alignment is not supported on AHV. Qemu-img will fail with errors due to the logical disk alignment when importing disks into AHV or migrating with Move. In Prism after importing the image you will see the following failure of an Image Update task:

In the acropolis.out the file you will find an error, stating it failed to convert the image.

2020-09-22 13:25:14,646Z INFO download_util.py:160 File size for nfs://127.0.0.1/SelfServiceContainer/.acropolis/image/dda40e40-ed6e-49c4-b010-3fd285e9215c is 35353542656
Each error message will refer to an Assertion. This is because qemu-image does not know how to convert a 4k logically aligned disk. 

2020-09-22 13:25:14,646Z INFO download_util.py:160 File size for nfs://127.0.0.1/SelfServiceContainer/.acropolis/image/dda40e40-ed6e-49c4-b010-3fd285e9215c is 35353542656
From AOS 5.15.5+ LTS and  AOS 5.19+ STS, the error message has been improved to say:

2020-09-22 13:25:14,646Z INFO download_util.py:160 File size for nfs://127.0.0.1/SelfServiceContainer/.acropolis/image/dda40e40-ed6e-49c4-b010-3fd285e9215c is 35353542656
To view the properties of the disk run the following on a Hyper-V host using Powershell to confirm the disk properties.

2020-09-22 13:25:14,646Z INFO download_util.py:160 File size for nfs://127.0.0.1/SelfServiceContainer/.acropolis/image/dda40e40-ed6e-49c4-b010-3fd285e9215c is 35353542656
The below example of a VHDX disk has a logical sector size set 4k:

2020-09-22 13:25:14,646Z INFO download_util.py:160 File size for nfs://127.0.0.1/SelfServiceContainer/.acropolis/image/dda40e40-ed6e-49c4-b010-3fd285e9215c is 35353542656
 . AHV does not support importing logical 4k aligned VHDX images from Hyper-V source VMs. . ### 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.
### Human: Can you tell about VMDK image upload fails with "Invalid footer" error. ### Assistant: Creating an image from corrupted VMDK fails with "Invalid footer" error. Uploading a disk image to Prism > Image Configuration that involves a conversion from vmdk to the AHV qcow2 format may show the state as "Inactive" and the size as "-".

Image uploads are logged in the /home/nutanix/data/logs/acropolis.out log file of the Acropolis leader.

KB 2305 describes steps on how to find an Acropolis leader.

Look in the acropolis.out log file on the indicated node for "qemu-img", which will show conversion attempts from vmdk format to qcow2 format.

nutanix@cvm$ grep qemu-img ~/data/logs/acropolis.out

The "Invalid footer" indicates the vmdk is corrupt, which will create a corrupted qcow2 image.

A corrupt vmdk can also be verified by using a standalone version of the qemu-img conversion tool.. The vmdk disk image needs to be exported again.. ### 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.
### Human: Can you tell about NCC Health Check: ahv_rpmdb_integrity_check. ### Assistant: NCC 4.3 The ahv_rpmdb_integrity_check verifies the integrity of RPM database on the AHV host. The NCC health check ahv_rpmdb_integrity_check verifies the integrity of the RPM database on the AHV host. RPM database inconsistencies can lead to the host becoming non-upgradable.

Running the NCC Check

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

nutanix@cvm$ ncc health_checks run_all

Or you can run the 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 RunThis check applies only to the AHV hypervisor and does not run on Prism Central.The check is scheduled to run every 6 hours.This check will not generate an alert.Sample outputFor Status: PASS

nutanix@cvm$ ncc health_checks run_all

For Status: WARN

nutanix@cvm$ ncc health_checks run_all
For Status: ERR
nutanix@cvm$ ncc health_checks run_all
Output messaging

Check ID111093DescriptionChecks if RPM database is inconsistentCauses of failureFound corrupted RPM database(s) on AHV host(s).ResolutionsSource of corruption needs to be identified and fixed.			RPM DB may need repair or host may need to be re-imaged.			Refer to KB 10397 for details.ImpactAHV host upgrades may fail
. Multiple improvements were made in RPM database handling in AHV 20220304.242.Upgrade AHV to version 20220304.242 or newer to prevent the issue from happening.If this check is failing, the source of inconsistencies needs to be identified and fixed. RPM DB may need repair, or the host may need to be re-imaged.To speed up the resolution time, collect and attach the following information to the support case:

A complete NCC report:
	nutanix@cvm:~$ ncc health_checks run_all
	A log bundle is generated from the cluster. This can be collected through Prism Web Console's health page. Select Actions > Collect Logs. Logs can also be collected through the command line using logbay (KB 6691 - NCC - Logbay Quickstart Guide):
	nutanix@cvm:~$ ncc health_checks run_all
	. ### 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.
### Human: Can you tell about CVM cannot power on after ESXi host is configured as dedicated failover host in HA configuration. ### Assistant: CVM cannot power on after ESXi host is configured as dedicated failover host in HA configuration. If an ESXi host is set as a dedicated failover host in vSphere HA configuration, the Controller VM (CVM) cannot boot up after shutdown. You see an error message similar to:

no available resources

vSphere HA feature does not allow any VMs running on a host that is set as a dedicated failover host. But in a Nutanix cluster, the CVM needs to run on each host.

From VMware vSphere Availability guide

"To ensure that spare capacity is available on a failover host, you are prevented from powering on virtual machines or using vMotion to migrate virtual machines to a failover host. Also, DRS does not use a failover host for load balancing.". Do not configure dedicated failover hosts.

Refer to vSphere HA Settings in the vSphere Administration Guide for Acropolis.. ### 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.
### Human: Can you tell about OVA export from Prism Central fails with 'Internal Server Error. kInternalError: Internal Error: 5 :Error accessing ovas capabilities'. ### Assistant: Following steps for 'Exporting a VM as an OVA' in the Prism Central (PC) Infrastructure Guide, OVA export from PC fails with 'Internal Server Error. kInternalError: Internal Error: 5 :Error accessing ovas capabilities'.. Issue encountered when following the instructions in the Prism Central (PC) Infrastructure Guide for 'Exporting a VM as an OVA'.

After clicking 'Export', the following error occurs:

Internal Server Error. kInternalError: Internal Error: 5 :Error accessing ovas capabilities.

The Prism Element (PE) clusters to which the OVA is being exported meet the prerequisites of a minimum AOS version of 5.18 and a minimum of PC 5.18. Performing this task with the VM powered on or off or exporting with disk format as QCOW2 or VMDK returns the same error.



Log messages that can be seen in Aplos (~/data/logs/aplos.out) on Prism Central VM:

Internal Server Error. kInternalError: Internal Error: 5 :Error accessing ovas capabilities.

Metropolis (~/data/logs/metropolis.out) log may also record the error:

Internal Server Error. kInternalError: Internal Error: 5 :Error accessing ovas capabilities.. This is caused by an incorrect Prism Central certificate setup.

What is expected:

nutanix@PCVM$ sudo sed -e 1b -e '$!d' /home/private/server.key

Example of incorrect certificate setup:

nutanix@PCVM$ sudo sed -e 1b -e '$!d' /home/private/server.key

Generate a self-signed certificate that adheres to the formatting the system expects by issuing the command below from a Prism Central VM:

nutanix@PCVM$ sudo sed -e 1b -e '$!d' /home/private/server.key

At this point, you should be able to test the OVA export. Review and correct your custom SSL certificates before you upload them again to Prism Central.. ### 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.
### Human: Can you tell about Prism console slowness for Windows VMs running on AHV. ### Assistant: Slow Prism VM console for Windows. In some scenarios visual performance of the VM console in Prism UI may be degraded. Symptoms include:
Typing is not immediately recognized on screen. That is, user is typing and there are several seconds of delay until the text is shown on screen.Mouse pointer control can be slow or frozen.Switching between opened applications is very slow in responsiveness.

Please note that at the same time VM itself may perform fine. Symptoms may get worse with increased latency between users computer and VM running on cluster.The reason behind this is because the entire screen must be scraped many times a second (refresh rate) as AHV has no visibility into what is happening inside the guest OS. This process is expensive in nature as it is continuously parsing the framebuffer which introduces some level of latency.Nutanix recommends using Microsoft Remote Desktop (RDP) to connect to Windows VMs.. Improve the general usability performance of the console by disabling the visual effects in Performance Options:
Navigate to System Properties: Navigate to Advanced System SettingsNavigate to Performance Settings:Select "Adjust for best performance"Note: In a VDI environment, please ensure that this is updated on the master/gold image.. ### 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.
### Human: Can you tell about Prism - No compatible products found for the uploaded cluster summary file. ### Assistant: PE licensing error 'No compatible products found while licensing cluster'. When a customer tries to update a license on a cluster, they get the below error:

Error : No-compatible-products-found
. The licenses need to be applied through Prism Central. If customers have not installed Prism Central, their AOS version needs to be 6.0.1 or higher, and the Prism Central version needs to be 2022.4 or higher. After upgrading to the current version of Prism Central, the licenses will be applied by downloading the cluster summary file from Prism Central. 

If you need assistance installing Prism Central or applying the license, contact Nutanix Support.

 . ### 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.
### Human: Can you tell about Prism - Support of AES encryption / SHA digest. ### Assistant: AOS/Prism Central support only the 'AES' encryption and 'SHA' digest algorithm for SNMP. This 'AES' means 'AES-128', and 'SHA' means 'SHA-1'.. Several AES encryption options exist. The naming used indicates the protocol followed by the length of the key after a dash, for example, AES-128, AES-256, SHA-1, SHA-2, SHA-256, etc.The Prism UI provides no option to select the length of the AES or SHA key:This article explains which AES encryption / SHA digest variant is supported in Prism SNMP settings. . Nutanix SNMP AES/SHA implementations comply with the below standards below:
RFC-3826 defines only AES-128. AES in Prism uses AES-128.RFC-3414 defines two types of encryption protocols: HMAC-MD5-96 and HMAC-SHA-96. HMAC-SHA-96 uses the SHA-1 digest algorithm (RFC-3174), which is what Prism uses. . ### 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.
### Human: Can you tell about NCC Health Check: cvm_dvportgroup_binding_check. ### Assistant: NCC 3.6.2. The NCC health check cvm_dvportgroup_binding_check checks if the CVM (Controller VM) NIC is connected to a dvPort group with ephemeral binding and recommends static binding if it is so.. The NCC health check cvm_dvportgroup_binding_check checks if the CVM (Controller VM) NIC is connected to a dvPort group with ephemeral binding and recommends static binding if it is so.

For virtual machines backed by dvPort group with ephemeral/dynamic binding in a ESXi environment, there is a possibility that the virtual machines may lose network connectivity after a host reboot. This is a known VMware issue described in https://kb.vmware.com/kb/1021938.

This check has been introduced for NCC version 3.6.2 and above.

Running the NCC check

This NCC check runs as part of a full health check:

nutanix@cvm$ ncc health_checks run_all

It can also be run as an individual health check:

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 will run on ESXi hypervisor platforms.

This check is not scheduled to run at an interval.

This check will not generate an alert.

Sample output

For status PASS:

nutanix@cvm$ ncc health_checks run_all

Output messaging

Check ID3025DescriptionCheck for CVM dVportgroup bindingCauses of failureOne (or more) Nutanix cluster Controller VM NIC is connected to a dVportgroup with ephemeral binding.ResolutionsChange the Dvportgroup binding to staticImpactThe cluster may experience downtime.. If the ephemeral port binding is used, change it to Static binding. For instructions on setting a static binding, refer to VMware documentation - https://pubs.vmware.com/vsphere-51/index.jsp?topic=%2Fcom.vmware.vsphere.networking.doc%2FGUID-809743E1-F366-4454-9BA5-9C3FD8C56D32.html.

This is due to a pynfs issue. Nutanix used to recommend ephemeral binding when configuring dVswitch. This is no longer the case.

If you are using static binding or a standard switch, gather required logs (VMware support bundle) and contact Nutanix Support for further investigation.. ### 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.