How It works

Acropolis Dynamic Scheduling proactively monitors the nutanix cluster for any compute and storage I/O contentions or hotspots over a period of time. If ADS detects a problem, ADS creates a migration plan that eliminates hotspots in the cluster and migrates VMs from one host to another. We can monitor VM migration tasks from the Task dashboard of the Prism Element web console Following are the advantages of ADS ADS improves the initial placement of the VMs depending on the VM configuration Nutanix volumes uses ADS for balancing sessions of the externally available iSCSI targets  

Just a few questions re sequential I/O and the OPLOG versus the Extent Store. If the I/O is deemed sequential in nature, will this always bypass the OPLOG or only when the write operation is larger then 1MB?  Does bypassing the oplog mean that the write will be a lot slower in comparison?  It still hits the SSD so my assumption is that it’s going to be the same. Why does the process of coalescing the writes before sequentially draining them help with performance? I’m interested in why this step is necessary as opposed to just writing directly to the SSD and then replicating out.

Hi,I can’t access LCM in my CE cluster. It just says “LCM Framework Update is in progress. Please check back when the update process is completed.” It’s been like this for days. Updating Foundation and NCC worked fine the old way.I can’t see any active tasks in Prism or using ecli task.listAny ideas?

I am interested on visualizing east west traffic as well as egress within my NTX environment. With Open vSwitch it seems to be supported through the default vTap interface on the bridges created on my interfaces.  My question is, has anyone successfully set up a Nutanix vTap interface to capture packet flow on an external appliance and are there any negative side effects of such a design (overhead, congestion, latency… etc)?  I do have an upstream appliance that can handle the analysis similar to Gigamon, CloudLens and ExtraHop.   https://docs.openvswitch.org/en/latest/topics/tracing/

Below are new knowledge base articles published on the week of February 28-March 6, 2021.KB 10526 - Alert - A200401 - VM forcibly powered off KB 10856 - Cluster Maintenance Utility version via cli KB 10861 - Acropolis crashing with "KeyError: u'off'" error after upgrade to 5.19.x KB 10863 - Non-admin AD users cannot Clone a VM when added to a Custom RBAC role on PC KB 10878 - VMSA-2021-0002 / ESXi OpenSLP / Disable CIM Server

The flash mode for VM allows to set the storage tier preference to SSD for a virtual machine or a volume group.  Without flash mode, data for a mission critical application such as a relational database can run out of the room in the SSD tier because other workloads running on the same cluster.  When this happens, the database could potentially migrate to the HDD tier. For extreme latency sensitive workloads, this migration to the HDD tier could negatively affect the read and write performance.  By default, you can use up to 25% of the cluster-wide SSD tier as flash mode space for VMs or VGs.

In the default AHV network schema, ther’s a connection between the AHV management and the virbr0. Can you explain me the purpose of that connection and the IP adresses used ? 

Hi,I would like to configure anti-afinity on on the VMs. I checked this only able to configure thru command. To configure the rules, does the VMs need to be powered down?

As Nutanix is constantly striving to be an API driven company and exposing more of its core functionality via API’s as well as improving integration with tools such as Ansible and Terraform, we hope you have been making the most of it. For example, did you know how to check the status of NGT and the NGT communication link using API’s? It is easily obtainable using the v3 REST API exposed from your Prism Central. Issue a GET request to https://<PC_IP_address>:9440/api/nutanix/v3/vms/<vm_uuid> Filter through the response to find a block similar to this.  

Hello, I am trying to collect some VM performance data from Prism element. I have noticed that some stats do not keep history for more than 5 minutes.   Example: controller_io_bandwidth_kBps vs. controller_read/write_io_bandwidth_kBps   GET 'https://{IP}:9440/PrismGateway/services/rest/v1/vms/{vmid}/stats/?metrics=controller_io_bandwidth_kBps&startTimeInUsecs=1589462400000000&intervalInSecs=300'   "statsSpecificResponses": [     {       "successful": true,       "message": null,       "startTimeInUsecs": 1589462400000000,       "intervalInSecs": 300,       "metric": "controller_io_bandwidth_kBps",      "values": [         8106,         5500,

If the clusters are related with prism central (so I should use v3), Can i use v2 to actions like: manage NIC, Attach/Detach Disks, manage snapshots from API v2?Is recovery plans is the same as snapshots here? I want to create jobs for automatic snapshots, but I do not see thios possibility in v2I am using the same account for api v2 and v3 actions, in production environment with my own IP, it will be the same host? It is specified in API Documentation, but I want to be sure if the host for both will be the same - eg. nutanixtest.com/v2… and nutanixtest.com/v3…Thanks!

HPE® ProLiant® Hardware CompatibilityThis document specifies the hardware, software, and firmware that the Nutanix platform requires to run on HPE® ProLiant® servers. Supported Hardware Models Hardware Hardware Supported Models HPE® Gen10 Servers HPE® ProLiant® Servers

Nutanix cluster requires three nodes minimum but Nutanix also offers the option of two-node cluster. By configuring external witness VM in a separate failure domain to the configuration provides  resiliency features of a three-node cluster.Requirements: Controller VM minimum requirements: 6 vCPU and 20 GB memory Replication factor (RF): RF2 spanned over two nodes and RF4 for metadata on SSDs over two nodes. RF4 for metadata helps during a node failure scenario to quickly transition the healthy node to run in single-node mode with the metadata remaining disk fault tolerant. (Metadata in a two-node cluster is typically small, so the storage need for four copies is modest.)

I could get a ballpark idea when the next LTS be designated. Seems like its been awhile. I would like to get off the STS train.

Below are new knowledge base articles published on the week of February 21-27, 2021.KB 9288 - Alert - A1102 - PhysicalDiskAdd KB 10533 - Alert - A200403 - Non Compliance with Host Affinity policies. KB 10535 - [ Karbon ] Alerts stay in firing state in a Karbon Cluster UI KB 10815 - VMDK disk image uploaded to Prism shows as "Inactive" with no size KB 10819 - [Karbon] Karbon UI not loading after scaleout PC upgrade to pc.2021.1 - "upstream co

Below are the top knowledge base articles for the month of February 2021.KB 7503 - NX Hardware [Memory] – G6, G7 platforms - DIMM Error handling and replacement policy KB 1540 - What to do when /home partition or /home/nutanix directory on a Controller VM is full KB 4141 - Alert - A1046 - PowerSupplyDown KB 4409 - LCM: (Life Cycle Manager) Troubleshooting Guide KB 4158 - Alert - A1104 - PhysicalDiskBad

LCM simplifies Nutanix IT infrastructure life cycle operations by consolidating software and firmware component upgrades into a unified control plane. Prerequisites·   It's recommended to have a cluster with at least three nodes to perform a normal rolling hypervisor upgrade.·  

The iSCSI Data Services IP address is used to provide iSCSI access to the cluster storage. It is primarily used by Nutanix Volumes, but is also leveraged by other products such as Calm, Leap, Karbon, Objects and Files. This IP address is owned by one CVM of a cluster at a time, with ownership changing among the CVMs as needed to ensure that it is always available. To note, the iSCSI Data Services IP address CVM owner does not necessarily correlate with the CVM that currently maintains Prism service leadership.To find the current CVM acting as the iSCSI Data Services IP address owner, simply obtain the IP address output from all of the CVMs (generally by using the “allssh ifconfig” command) and verify which CVM reports as having this address. To find when a ownership change has occurred, the Stargate service logs from each CVM can be filtered for entries r

Hi. I have a question while using Xi Frame.If I want to use the List active session and stop  session functions among the Xi Frame functions, what privileges should the administrator at least be given to use them??For detailed functions, please check the red underlined area in the attached photo. 

Hi Nutanix Community, We often wonder what is the real storage capacity available on a Nutanix cluster. We have a three node cluster, in RF2. In Prism Element main page, under "Storage Summary", I see : 20.87TiB free (logical) of 22.37 TiB https:// Data Resiliency is OK. (green) Which one of the following statements is correct ? I can fill my storage up to 22.37 TiB without losing the data resiliency (=I can lose a node without losing data). I can fill my storage only up to 66% of 22.37Tib (= 14.76Tib) without losing the data resiliency Thank you 🙂

Below are new knowledge base articles published on the week of February 14-20, 2021.KB 9314 - Nutanix-Auth-FAQ KB 9866 - NCC Health Check: ergon_checks KB 10310 - Alert A801101 - L2StretchDeletionFailure KB 10574 - Pre-Upgrade check: test_vmd_node_esxi_upgrade_versions_compatible KB 10657 - Discrepancy between Memory Capacity on Prism and Hyper-V

Hi,My company is going through a major organization change, and we will be driving a lot of VM automation through Ansible.  Since all of us know that the Powershell support is woefully lacking in AHV, I would like to try to get more automation plugged in through Ansible.  Is there an example playbook out there for upgrading/installing NGT for both Windows and Linux?I know that updating NGT via Prism Central works pretty well for Windows, but once again, it fails miserably for Linux (at least OUL).  I would like to do it in an automated fashion, however, instead of 60 checkboxes at a time.  I need a feature that I can upgrade hundreds of VM’s at once and schedule it.Any assistance would be appreciated!

The shutdown token is used by a Nutanix cluster to prevent more than one entity from being down or offline during the occasion of software upgrades or other cluster maintenance. The CVM that is holding the token is the only entity allowed to be down or offline. Sometimes, for various reasons, a CVM can remain holding the token even after an upgrade or maintenance has been successfully completed. This usually does not cause any issues, however, until another upgrade or maintenance is invoked on the cluster sometime in the future. Upgrades or other maintenance pre-checks will search for any unrevoked tokens and, if existing, not proceed until that token has been properly revoked. Before manually revoking the token, it is good practice to verify that there are indeed no outstanding or ongoing upgrades or maintenance activities currently occurring with the cluster. Once confirmed, manual token revocation is often accomplished by a simple restart of the Genes

Windows 10 VM stuck at boot and giving black screen. Tried reboot but no luck.

Hello All, I have created this great powershell script that makes VM’s in AHV. It has been a journey let me tell you, but I made it through. The one thing I would like to add to this is creating a vm with UEFI boot option. I know this needs to be done at creation and I can create it in the acli with the following: acli vm.create UEFIVM2 uefi_boot=true However; is there a way to do this with powershell? I will look at finding a way to wrap the ssh command above but it sure would be nice if it was just a parameter on the                         new-ntnxvirtualmachine cmdletIs there a way I can create the vm with UEFI with powershell? Thanks,Scott