I have a problem when starting up a cluster using the 'Restart Cluster' command after rebooting the cluster. shirano2. 0 U2 (83654) | VMware KBMy problem was a little "bigger". I know that you can migrate the VMs off of the. All looks good but I just can't get these vCLS VM's back. Configuring Host Graphics61. For this, Monitor/MWAIT needs to be enabled in. domain-c(number). With vSphere 7 U1, VMware introduced vSphere Clustering Service (vCLS), which helps in a situation when vCenter Server becomes unavailable. Navigate to the vCenter Server Configure tab. Click Edit Settings, set the flag to 'false', and click Save. It's. For every host on this new cluster, if i exit MM the vCLS vm attempts to deploy but fails with "No host is compatible with the virtual machine". Why are vCLS VMs visible? Hi, with vSphere 7. Most notably that the vCLS systems were orphaned in the vCenter inventory, and the administrator@vsphere. No, those are running cluster services on that specific Cluster. If a user tries to perform any unsupported operation on vCLS VMs including configuring FT, DRS rules or HA overrides on these vCLS VMs, cloning. Afaik, there is no documented method to assign the required permission to the vCLS folder and it's content. This is the cause of failure to retry the cluster shutdown operation. So vCLS is not needed. VsphereInventoryService : found the VM vCLS (XX) VirtualMachine:vm-XXXXXX @ instance uuid found XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX WARN c. I'm trying to get my vSphere/Nutanix shutdown steps and scripts/snippets documented, and with the advent of the three vCLS VMs used to maintain DRS and HA services in vCenter 7, I'm a little unsure what to do. vSphere 7's vCLS VMs and the inability to migrate them with Essentials licenses. 7 Release Notes and. 0 Update 3 部署時，便會啟用. I have no idea why. " Undrer VM logs it says: Vladan Seget Tue, Nov 3 2020 vmware, virtualization 1. If you are protecting large LUNs, use only thick provisioned LUNs to. This can be checked by selecting the vSAN Cluster > VMs Tab, there should be no vCLS VM listed. ; Power off all virtual machines (VMs) running in the vSAN cluster, if vCenter Server is not hosted on the cluster. The additional information section of this article includes a list of tasks that are known to cause a virtual machine to appear unresponsive. 0. vSphere Cluster Services (vCLS) is a new feature in vSphere 7. Be default, vCLS property set to true: config. Now the most safest way is to create a temporary folder on old DS and move these files to the temporary folder and check if everything is ok. New vCLS VMs will not be created in the other hosts of the cluster as it is not clear how long the host is disconnected. Transfer the downloaded Module folders toHi, I work on a vCenter 7. These are lightweight agent VMs that form a cluster quorum. When a vSAN Cluster is shutdown (proper or improper), an API call is made to EAM to disable the vCLS Agency on the cluster. However we already rolled back vcenter to 6. 0 Update 1, the vSphere Clustering Services (vCLS) is made mandatory deploying its VMs on each vSphere cluster. 0 Update 3 build from VMware Customer Connect, you must navigate to Products and Accounts > Product Patches. The new timeouts will allow EAM a longer threshold should network connections between vCenter Server and the ESXi cluster not allow the transport of the vCLS OVF to deploy properly. Go to the UI of the host and log in. 0. 11-14-2022 06:26 PM. 12-13 minutes after deployment all vcls beeing shutdown and deleted. cfg. vSAN) after vCenter is upgraded to vSphere 7. As you know, if you lose vCenter Server, you also lose the Distributed Resource Scheduler (DRS), so your VMs are no longer balanced across your. I had also a host with 6. a. However, what seems strange is that these VMs have been recreated a whole bunch of times, as indicated by the numbers in the VM names: vCLS (19), vCLS (20), vCLS (21), vCLS (22), vCLS (23), vCLS (24), vCLS (25), vCLS (26), vCLS (27) I've noticed this behavior once before: I was attempting to. Moved all vCLS VM's to newly added ISCSI based datastore. Module 'FeatureCompatLate' power on failed. That did the trick for me, and after that disabling retreat mode redeployed the VM’s. . txt. 0. 2. I have also appointed specific datastores to vCLS so we should be good now. Healthy – The vCLS health is green when at least 1 agent VM is running in the cluster. 2. You see a waResolution. vCLS. I see no indication they exist other than in the Files view of the datastores they were deployed on. Log in to the vCenter Server Appliance using SSH. Cluster was placed in "retreat" mode, all vCLS remains deleted from the VSAN storage. The deployment of these VMs will fail in such a cluster. Compute policies provide a way to specify how the vSphere Distributed Resource Scheduler (DRS) should place VMs on hosts in a resource pool. clusters. A virtual machine fails to power on with the error: Unsupported and/or invalid disk type: Virtual disk 'Hard disk 2' is a mapped direct-access LUN that is not accessible: The host attempting to start or receive the virtual machine cannot access the device (LUN) backing the raw disk mapping The algorithm tries to place vCLS VMs in a shared datastore if possible before selecting a local datastore. 7およびVxRail 7. maybe it will be really a straightforward option but what if you will reconfigure a vmx file via notepad for vCLS VM. Performing start operation on service eam…. What we tried to resolve the issue: Deleted and re-created the cluster. Take a backup from file /etc/vmware-vpx/vpxd. When you add the first three hosts to the cluster, vSphere Cluster Services (vCLS) agent virtual machines are added by default to the cluster. I added 4 of those "config. For example, you can now set the datastores where vCLS can run and should run. 0 U1 and 7. All vcls get deployed and started, after they get started everything looks normal. 0 Update1新引入的vSphere Clustering Service,简单来说，把一部分控制平面的功能，从vCenter中解耦，并且分布式的由最多3个轻量级虚拟机per Cluster（VMware PhotonOS）分担。. 0. vCLS VMs hidden. vcls. 0 Update 1 and newer versions (80472) (vmware. The vCLS virtural machine is essentially an “appliance” or “service” VM that allows a vSphere cluster to remain functioning in the event that the vCenter Server becomes unavailable. This didn’t happened with the previous datastore that I had to put in maintenance mode, so it was a bit confusing. vCLS VMs are usually controlled from vCenter EAM service. Follow VMware KB 80472 "Retreat Mode steps" to enable Retreat Mode, and make sure vCLS VMs are deleted successfully. Admins can also define compute policies to specify how the vSphere Distributed Resource Scheduler (DRS) should place vCLS agent. PowerState -eq "PoweredOn"} | select Name, PowerState, Folder, VMHost | sort Name | out-file c:virtualinventory unningVMsverbose. After vCenter Server Appliance (VCSA) upgrade to 7. ESXi主机启用EVC特性的时候，报错“主机的CPU硬件应支持群集当前的增强型vMotion兼容性模式，但主机现在缺少某些必要的CPU功能。. "VM storage policy is not. With vCenter 7, VMware introduced the VMware cluster services concept that uses "vCLS" vm's. sh finished (as is detailed in the KB article). Be default, vCLS property set to true: config. 0 Update 1」の日本語訳です。記事はベストエフォートで翻訳を進めているため、ローカライズ化コンテンツは最新情報ではない可能性があります。最新の内容については、英語版の記事を参照してください。128K subscribers in the vmware community. A datastore with more free space is preferred and the algorithm tries not to place more than one vCLS VM on the same datastore. Repeat steps 3 and 4. VMware would like to make critical cluster services like vSphere High Availability (HA) and vSphere Distributed Resource Scheduler (DRS) always available and vCLS is an initiative to reach the vision. v. This can be checked by selecting the vSAN Cluster > VMs Tab, there should be no vCLS VM listed. > vCLS VM ですが、通常の VM と同じくシャットダウンする事はできますが、すぐに自動的に起動してしまうため、完全に停止するためには Retreat Mode とすることが確実です。 自動的に起動することを失念していました。仰る通り、リトリートモードが確実ですね。 The vCLS agent VMs are tied to the cluster object, not the DRS or HA service. The vCLSs get provisioned on vSAN but never start. On smaller clusters with less than 3 hosts, the number of agent VMs is equal to the numbers. So I swore at this issue for a day or so too, after migrating from VCSA 6. Program to override vCLS default VM placement and allow/disallow vCLS VM placement on specific datastores. com) Be careful though! Good luck. This is the long way around and I would only recommend the steps below as a last resort. Confirm the VM Compatibility Upgrade (click on [YES]). 使い慣れたVMwareツールを使用して完全に制御できます。. But vCenter was reporting version 4 in the overview. Move the Virtual Machines of the vSphere Cluster Services to the Principle Datastore in Region A. They will power on automatically once your hosts and vCenter come back online. > vCLS VM ですが、通常の VM と同じくシャットダウンする事はできますが、すぐに自動的に起動してしまうため、完全に停止するためには Retreat Mode とすることが確実です。 自動的に起動することを失念していました。仰る通り、リトリートモードが確実ですね。The vCLS agent VMs are tied to the cluster object, not the DRS or HA service. PowerCLI -Path <path to download files>”. Under Advanced Settings, click the Edit Settings button. ESXi主机启用EVC特性的时候，报错“主机的CPU硬件应支持群集当前的增强型vMotion兼容性模式，但主机现在缺少某些必要的CPU功能。Failed to power on virtual machine. host updated with 7. Maintaining Health of vSphere Cluster Services. To resolve the anomaly you must proceed as follows: vCenter Snapshots and Backup. x, the UI shows actual usage percentages rather than. For example, if you have vCLS VMs created on a vSAN datastore, the vCLS VM get vSAN encryption and VMs cannot be put in maintenance mode unless the vCLS admin role has explicit migrate permissions for encrypted VMs. " from reading this article, it seems like the idea is NOT to place VMs that are tagged, in the same host as vcls vms - which is a strange idea. Click on “Edit” and click on “Yes” when you are informed to not make changes to the VM. This might occur, for example, if no host can satisfy the virtual machine's CPU or memory resource needs or if no host currently has network or storage access needed by the virtual machine. The issue remains. local: No template found for 17004997_7. Note: If your vCenter Server has been running for more than 120 days, it is best practice to perform updates to the vCenter Server OS if any are available for that vCenter Server version. Either way, below you find the command for retrieving the password, and a short demo of me retrieving the password and logging in. 100 以降で必要です ※VxRail 4. 0 Update 1. The health and status is monitored. 2. Mechelen, Mechelen, Belgium 2800. ユーザーは、アプリケーションの再設計や操作の再構築を行わ. Disconnected the host from vCenter. But vcls in new cluster cant created. When you power on VC, they may come back as orphaned because of how you removed them (from host while VC down). If this is the case, you will need to stop EAM and delete the virtual. mwait' was absent, but must be present. vCLS garantit que si vCenter Server devient indisponible, les services de cluster restent disponibles pour préserver les ressources et la santé des charges de travail qui s'exécutent dans les clusters. Degraded : Yellow: If there is no vCLS VM running for less than 3 minutes (180 seconds), the status is degraded. Search for <vcls> inside the file. All looks good but I just can't get these vCLS VM's back. 0 Update 1. Many VMware customers have already upgraded to vSphere 7 Update 1 but may not be fully aware of its new features, such as. Summary: After deploying CO and HCI services using PFxM 3. . No luck so far. DRS is not functional, even if it is activated, until vCLS. On a stretched vSAN 7. 0. ESXi host disconnect/reconnect), vpxd may reserve an additional slot for vCLS Virtual Machine under race condition. Log in to the vCenter Server Appliance using SSH. 0. vSphere 叢集服務 (vCLS) 預設處於啟用狀態並且在所有 vSphere 叢集中執行。vCLS 可確保在 vCenter Server 變得無法使用時，叢集服務仍可用於維持在叢集中執行之工作負載的資源和健全狀況。 仍需要 vCenter Server 才能執行 DRS 和 HA。. When vCLS VMs are being deployed, they are created in a folder called "ESX Agents" instead of the default vCLS folder that stays empty. The vSphere Cluster Service (vCLS) was introduced with vSphere 7 Update 1. Register / Sign In. This issue is resolved in this release. If vCenter Server is hosted in the vSAN cluster, do not power off the vCenter Server VM or service VMs (such as DNS, Active Directory). Datastore enter-maintenance mode tasks might be stuck for long duration as there might be powered on vCLS VMs residing on these datastores. 8. ”. Give the cluster a few minutes after the enablement to deploy the vCLS VMs. SSH into your vCenter Server. Was a new naming scheme for vCLS VMs introduced in 7u3? Or is it a bug? Prior updating all vCLS VMs had a name like vCLS (125). After upgrading to vCenter 7. 3 vCLS Virtual Machines are created in vSphere cluster with 2 ESXi hosts,. See VMware Validated Solutions – October 2022 Update. vSphere Cluster Services (vCLS) is a new feature in vSphere 7. To avoid failure of cluster services, avoid performing any configuration or. VMware vSphere is the leading virtualization platform, enabling organizations to run, manage, and secure applications across cloud and on-premises environments with unmatched. Right-click the NAA ID of the LUN (as noted above) and click Detach. For example, the cluster shutdown will not power off the File Services VMs, the Pod VMs, and the NSX management VMs. enabled" from "False" to "True", I'm seeing the spawing of a new vCLS VM in the VCLS folder but the start of this single VM fails with:vCLS VM (s) are displayed as user VM (s) a fter cluster shutdown operation. 0 Update 1. vCLS ensures that if the vCenter Server becomes unavailable, cluster services remain available to maintain the resources and health of the workloads that run in the clusters. it is the VCSA Advanced Settings. service-control --start vmware-eam. Right click the vCLS VM within the host, and select "Upgrade VM Compatibility". Once you bring the host out of maintenance mode the stuck vcls vm will disappear. Description. Tags: a. And the newly created "vCLS" VM's that were created under ESXi 7. Next you need to install VMware PowerCLI – in the terminal type “pwsh” and then – Install-Module -Name VMware. 1) Disable HA. The basic architecture for the vCLS control plane consists of maximum 3 virtual machines (VM), also referred to as system or agent VMs which are placed on separate hosts in a cluster. 30-01-2023 17:00 PM. domain-c<number>. 5 and then re-upgraded it. Search the vcls secion (/vcls<ENTER>) Remove the <vcls></vcls> section. Admin deleted vcls vms : r/vmware. Got SRM in your environment? If so, ensure that the shared datastores are not SRM protected as this prevents vCLS VM deployment. In this blog, we demonstrate how to troubleshoot and correct this state automatically with vCenter's "Retreat Mode. Jump to solution. Before stsfix, we created a test cluster and moved ESXi - vcenter didn't create a vCLS VM here either. clusters. So with vSphere 7, there are now these "vCLS" VMs which help manage the cluster when vcenter is down/unavailable. Oracle Cloud VMware Solution は、顧客のテナンシ内にインストールされた、顧客管理のネイティブなVMwareベースのクラウド環境を提供します。. vCLS VMs are not displayed in the inventory tree in the Hosts and Clusters tab. . All vCLS VMs with the Datacenter of a vSphere Client are visible in the VMs and Template tab of the client inside a VMs and Templates folder named vCLS. The ESXi Hosts can be of any older version which is compatible with vCenter server 7. Updated on 08/30/2022. Some common maintenance tasks include: Host upgrades or patching; Host or storage. The number of vm's in the vCLS folder varies between 23-26 depending on when I look at it, but the. Proceeding to file select. Communities |. Except ALL hosts are being put into maintenance mode Rob. The Cloud Platform Tech Zone. Performance Charts do not limit percent values to 100%. Only administrators can perform selective operations on vCLS VMs. Unmount the remote storage. These VMs are deployed prior to any workload VMs that are deployed in a green. Starting with vSphere 7. Run this command to enable access the Bash shell: shell. 0 U3 contains two great vCLS enhancements In VM’s & Templates I see an empty folder labelled vCLS. EAM is unable to deploy vCLS VMs when vpxd-extension certificate has incorrect extended key usage values (85742) Symptoms DRS stops functioning due to vCLS VMs failing to deploy through EAM. [All 2V0-21. Reply. 5 and later supports datastores on large LUN sizes up to 128 TB on ASA aggregates. After this all your other 3rd party or VMware products like SRM, NSX etc if in use, needs to be re-registered. x of vCenter. The vSphere Clustering Service (vCLS) is a new capability that is introduced in the vSphere 7 Update 1 release. Do not skip any steps please do follow all the below-provided steps. Greetings Duncan! Big fan! Is there a way to programmatically grab the cluster number needed to be able to automate this with powercli. 場合、vCenter Server 再起動後に vSphere Client へ接続できなくなることや、. Exploring the Need for vCLS VM Migration. When selecting the vCenter Server instance in the vSphere Client and you go to Monitor > Skyline Health, it'll list all the vCLS enabled clusters. vSphere Cluster Services. vCLS in 7. This didn’t happened with the previous datastore that I had to put in maintenance mode, so it was a bit confusing. But apparently it has no intention to recreate them. Building on the installation and configuration content from our best-selling course, you will also develop advanced skills needed to manage and maintain a. Follow VMware KB 80472 "Retreat Mode steps" to enable Retreat Mode, and make sure vCLS VMs are deleted successfully. It should be the vSAN datastore. From description "vSphere Cluster Service VM is required to maintain the health of vSphere Cluster Services. By default, the VM group includes all unprotected instances. Hi team In the vCenter Server environment, I have created a Datacenter and a Cluster in which I have incorporated 5 hosts. 1. 3 cluster (4+4) we're getting Skyline warnings concerning vCLS VMs. This can be checked by selecting the vSAN Cluster > VMs Tab. With the tests I did with VMware Tools upgrades, 24h was enough to trigger the issue in a particular host where VMs were upgraded. Expand the vCLS folder. 02-14-2022 02:02 AM. Right-click the virtual machine and select Power > Shut down Guest OS. The plan is to get more independent of vCenter Server for certain cluster features like for example DRS. I would recommend spreading them around. 当ESXi少于3个时，vCLS虚拟机个数等于ESXi个数。. 3 all of the vcls VMs stuck in an deployment / creation loop. For more information, see How to register/add a VM to the Inventory in vCenter Server. 3. 0 Update 1 or later. Immediately after shutdown new vcls deployment starts. If your virtual machine is in this state, you may also want to search for the task and the percentage within the knowledge base. Also if you are still facing issues maybe you can power it off, delete it and then vCLS service will re-create it automatically. Set cluster to retreat, stop VC, power off and delete vCLS VMs from host inventory. Look for 'Retreat Mode'. An article on internet prompted me to delete the VM directly from the host (not through vCenter) and then removing and re-adding the host to clear the VM from the vCenter DB. At a customer site we're replacing a SAN storage. 既にお客様向けの VMware Knowledge Base (KB) が公開されていますが、設定方法に関するご質問. 0. For more information, see Upload Files to Datastores. VMware vCLS VMs are run in vSphere for this reason (to take some services previously provided by vCenter only and enable these services on a cluster level). Successfully stopped service eam. 1 on Dell EMC VxRail release includes the following: BOM updates: Updated Bill of Materials with new product versions, which includes NSXT 3. Simply shutdown all your VMs, put all cluster hosts in maintenance mode and then you can power down. enabled = true" settings, one for each cluster, with the correct ID: Nothing happened. DEBUG c. Run lsdoctor with the "-r, --rebuild" option to rebuild service registrations. This process will also require a reboot of the vCenter. vmware. 中でも高可用性（HA）とリソースの負荷分散（DRS）は、vSphereによる仮想化のメリットを最大限利用できるようにするコアな機能です。. Only administrators can perform selective operations on vCLS VMs. vSphere Resource Management VMware, Inc. To learn more about the purpose and architecture of vCLS, please see. Add VM Group. Now after updating the name is like vCLS-2fd5da14-5aa5-4ed5-b472-ba0b1981127a. Go back to where the virtual machine is listed in vSphere, right-click it, and select “All Virtual Infrastructure Actions. vCLS does not do the job of vCenter. After up grading vcenter to latest version. Is the example below, you’ll see a power-off and a delete operation. Hi, I've a problem with vSphere 7. clusters. Keeping to that update regimen can reduce the occurrence of. 0 Kudos PleasantDay. This duration must allow time for the 3 vCLS VMs to be shut down and then removed from the inventory when Retreat Mode is enabled before PowerChute starts the m aintenance mode tasks on each host. If you are not shutting them all down at once, don't worry about a thing, put host in maintenance mode and it knows what to do with the LCM VMs. The actual object health status like reduced availability need to be queried from server cluster which the client cluster is mounting from. . vCLS vm Looking for some guidance/help here. retreat modeの有効化については、VMware KB:80472などに手順の記載がございます。 vCLS VMs disappeared. Select a ESXi host and click the Storage view under Configure > Storage Devices: Note: Screenshot below is from a HTML5 vSphere Client environment. 0 Kudos PleasantDay. remoteAccessible: This status is only applicable for client vSAN cluster after mounting remote vSAN datastore and indicates the object is accessible from all hosts in client cluster. vCLS. vCLS VMs should not be moved manually. Resolution. clusters. It’s first release provides the foundation to work. 0 Update 1 is done. 00200, I have noticed that the vast majority of the vCLS VMs are not visable in vCenter at all. Battlesesteenweg 455. A vCLS VM anti-affinity policy describes a relationship between VMs that have been assigned a special anti-affinity tag (e. i have already performed following steps in order to solve this but no luck so far. This kind of policy can be useful when you do not want vCLS VMs and virtual machines running critical workload to run on the same host. The VMs just won't start. vCenter thinks it is clever and decides what storage to place them on. 0. 100未満では不要となります. Next up Anti-Affinity for vCLS. I tried to reboot the vCLS, same issue. All looks good but I just can't get these vCLS VM's back. But yes vCLS is doing some r/w data on the partitions. 3- If vcls vms failed , wil. vSphere Cluster Services (vCLS) is activated by default and runs in all vSphere clusters. vCLS is a mandatory feature that is deployed on each vSphere Cluster (incl. 上記 Retreat モードへの切り替えのパラメーターに誤った文字列を入力してしまった. That datastore was probably selected based on the vSphere algorithm for checking the volume with more free space available and more paths to different hosts. VsphereInventoryService : found the VM vCLS (XX) VirtualMachine:vm-XXXXXX @ instance uuid found XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX WARN c. vCLS VMs can be migrated to other hosts until there is only one host left. Cluster Agent VM is missing on cluster XYZ (vCLS) Just upgraded to vSphere 7 Update 1 and see that in the VMs and Templates view I see it created the folder for vCLS. log. Except ALL hosts are being put into maintenance mode Rob. vCLS in 7. vim. 00100_vcsa. vSphere Cluster Services (vCLS) VM datastore location is chosen by a default datastore selection logic. When anal. ) Unmount the Remote datastore and turned off the vSAN services. I am trying to get powercli to find all the vCLS VMs, but when I try to "Get-Folder 'vCLS' | Get-VM" it says: Get-Folder: 3/9/2022 9:56:22 AM Get-Folder Folder with name 'vCLS' was not found using the specified filter (s). These services are used for DRS and HA in case vCenter which manages the cluster goes down. This means that vSphere could not successfully deploy the vCLS VMs in the new cluster. 5u2 HPE custom image – same outcome. We would like to show you a description here but the site won’t allow us. Follow VxRail. Select an alarm and select Acknowledge. In this demo I am going to quickly show you how you can delete the vCLS VMs in vSphere/vCenter 7. vCLS provides a way to ensure high availability for the control plane components of Kubernetes clusters running on vSphere. In vSphere 7 update 1 VMware added a new capability for Distributed Resource Scheduler (DRS) technology consisting of three VMs called agents. 4, the Migrate vCLS VMs button is missing due to a code issue. (Which is disturbing, given that even the owner of the system can't resolve issues with the. Only administrators can perform selective operations on vCLS VMs. Note: Only copy the numbers to the left of the colon in the URL. Connect to VCSA using SSH session with root. n. The provided workaround aids in restoring proper vCLs VM deployment and cluster resource balance. So you need to enable Monitor/MWAIT in BIOS, then vcls vm will be powered on automatically. I have put the cluster into retreat and back to normal in order to re-create the vCLS VM's. The vSphere Cluster Service (vCLS) was introduced with vSphere 7 Update 1. Another reason : if VM was copied or moved. For the cluster with the domain ID, set the Value to False. Why are vCLS VMs visible? Hi, with vSphere 7. VMware introduced the new vSphere Cluster Services (vCLS) in VMware vSphere 7. 5) Shutting down esx4,esx5 and esx6. 5) If vCenter Server is hosted in the vSAN cluster, Power off the vCenter Server VM. vSphere Cluster Services (vCLS) ensure that if vCenter Server becomes unavailable, vSphere cluster services remain available to maintain the resources and health of the workloads. But when you have an Essentials or Essentials Plus license, there appears to be. I have tried creating a new cluster, moving a host to the new cluster & turning on DRS however this doesn’t generate any vCLS VM’s. . Blog: lucd. Hey there, folks. A quorum of up to three vCLS agent virtual machines are required to run in a cluster, one agent virtual machine per host.