enabled to true and click Save. If vCLS VMs are on the same host as production VMs, a host failure could affect both, potentially delaying or complicating the recovery process. ESX cluster with vCLS VMs NCC alert: Detailed information for host_boot_disk_uvm_check: Node 172. vCLS-VMs unterstützen. Be default, vCLS property set to true: "config. If it is not, it may have some troubles about vCLS. Note: vCLS VMs are not supported for Storage DRS. No luck so far. This document is intended for explicit diagnostics on vCLS VMs. Select the vCenter Server containing the cluster and click Configure > Advanced Settings. To ensure cluster services health, avoid accessing the vCLS VMs. A datastore is more likely to be selected if there are hosts in the cluster with free reserved DRS slots connected to the datastore. power on VMs on selected hosts, then set DRS to "Partially Automated" as the last step. Starting with vSphere 7. To override the default vCLS VM datastore placement for a cluster, you can specify a set of allowed datastores by browsing to the cluster and clicking ADD under Configure > vSphere Cluster Service > Datastores. All vcls get deployed and started, after they get started everything looks normal. In vSphere 7. Create and manage resource pools in a cluster; Describe how scalable shares work; Describe the function of the vCLS; Recognize operations that might disrupt the healthy functioning of vCLS VMs; Network Operations. Then apply each command / fix as required for your environment. NOTE: This duration must allow time for the 3 vCLS VMs to be shut down and then removed from theTo clear the alarm from the virtual machine: Acknowledge the alarm in the Monitor tab. We have 6 hosts (7. vCLS VM is a strip-down version of the photon with only a few packages installed. disable retreat mode, re-instate the vCLS VMs and re-enable HA on the cluster. All 3 vCLS vms power off once each day. Please reach out to me on this - and update your documetation to support this please!. vSphere. vSphere 7's vCLS VMs and the inability to migrate them with Essentials licenses. We tested to use different orders to create the cluster and enable HA and DRS. See vSphere Cluster Services for more information. I am trying to put a host in mainitence mode and I am getting the following message: "Failed migrating vCLS VM vCLS (85) during host evacuation. This can be checked by selecting the vSAN Cluster > VMs Tab, there should be no vCLS VM listed. The vCLS agent VMs are tied to the cluster object, not the DRS or HA service. You shut down the vSphere Cluster Services (vCLS) virtual. If vSphere DRS is activated for the cluster, it stops working and you see an additional warning in the cluster summary. Right-click the ESXi host in the cluster and select 'Connection', then 'Disconnect'. Click on “Edit” and click on “Yes” when you are informed to not make changes to the VM. m. When you create a custom datastore configuration of vCLS VMs by using VMware Aria Automation Orchestrator, former VMware vRealize Orchestrator, or PowerCLI, for example set a list of allowed datastores for such VMS, you might see redeployment of such VMs on regular intervals, for example each 15 minutes. I'm trying to delete the vCLS VMs that start automatically in my cluster. The VMs are inaccessible, typically because the network drive they are on is no longer available. The vCLS agent virtual machines (vCLS VMs) are created when you add hosts to clusters. Correct, vCLS and FS VMs wouldn't count. Run lsdoctor with the "-r, --rebuild" option to rebuild service registrations. Monitoring vSphere Cluster Services. Simply shutdown all your VMs, put all cluster hosts in maintenance mode and then you can power down. You can name the datastore something with vCLS so you don't touch it either. Starting with vSphere 7. Once the tool is copied to the system, unzip the file: Windows : Right-click the file and click “Extract All…”. The general guidance from VMware is that we should not touch, move, delete, etc. The workaround was to go to Cluster settings and configure a datastore where to move the vCLS VMs, although the default setting is set to “All datastores are allowed by the default policy unless you specify a custom set of datastores. 7 U3 P04 (Build 17167734) or later is not supported with HXDP 4. The three agent VMs are self-correcting. clusters. Also if you are still facing issues maybe you can power it off, delete it and then vCLS service will re-create it automatically. 5 and then re-upgraded it to 6. 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. These are lightweight agent VMs that form a cluster quorum. Note: If this alarm is on multiple virtual machines, you may select the host, cluster, data. Folders are a method of setting permissions in VMware vCenter. All VMs shutdown including vCenter Server Appliance VM but fails to initiate 'Maintenance Mode' on the ESXi Hosts. clusters. If that. vcls. See SSH Incompatibility with. 7 so cannot test whether this works at the moment. DRS balances computing capacity by cluster to deliver optimized performance for hosts and virtual machines. Here’s one. 0. However, for VMs that should/must run. 6 ESXi 6. Placing vCLS VMs on the same host could make it more challenging to meet those. vCLS is also activated on clusters which contain only one or two hosts. domain-c7. The configuration would look like this: Applying the profile does not change the placement of currently running vm's, that have already be placed on the NFS datastore, so I would have to create a new cluster if it takes effect during provisioning. Reply. ”. More specifically, one that entitles the group to assign resource pools to a virtual machine. Since the use of parenthesis () is not supported by many solutions that interoperate with vSphere, you might see compatibility issues. g. There is no other option to set this. . Repeat steps 3 and 4. Click Edit Settings, set the flag to 'false', and click Save. 0 Update 1. MSP supports various containerized services like IAMv2, ANC and Objects and more services will be on. I happened upon this issue since i need to update the VM and was attempting to take a snapshot in case the update went wrong. 2. Unfortunately, one of those VMs was the vCenter. Click Edit Settings, set the flag to 'false', and click Save. VMware released vSphere Cluster Services in version 7 Update 1. Please wait for it to finish…. You cannot find them listed in Host, VM and Templates or the datastore view. Click Edit Settings, set the flag to 'true', and click Save. If a disconnected host is removed from inventory, then new vCLS VMs may be created in. The VMs just won't start. If running vSphere 7. We would like to show you a description here but the site won’t allow us. Deleted the remotes sites under data protection and deleted vCenter and vCLS VMS ;) Enable and Configure Leap. This can generally happens after you have performed an upgrade on your vCenter server to 7. Be default, vCLS property set to true: config. vCLS monitoring service will initiate the clean-up of vCLS VMs and user will start noticing the tasks with the VM deletion. Power-on failure due to changes to the configuration of the VMs - If user changes the configuration of vCLS VMs, power-on of such a VM could fail. It actually depends on what you want to achieve. I've followed the instructions to create an entry in the advanced settings for my vcenter of config. 04-13-2022 02:07 AM. 0 U1c and later to prevent orphaned VM cleanup automatically for non-vCLS VMs. . Admins can also define compute policies to specify how the vSphere Distributed Resource Scheduler (DRS) should place vCLS agent virtual machines (vCLS VMs) and other groups of workload VMs. vSphere Cluster Service VMs are required to maintain the health of vSphere DRS" When im looking in to my VM and Templates folers there is an folder called vCLS but its empty. If this tag is assigned to SAP HANA VMs, the vCLS VM anti-affinity policy discourages placement of vCLS VMs and SAP HANA VMs on the same host. It now supports 32k volumes per Service, aligned with PowerFlex core software volume scalability. esxi hosts1 ESXi, 7. 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. When logged in to the vCenter Server you run the following command, which then returns the password, this will then allow you to login to the console of the vCLS VM. vSphere DRS remains deactivated until vCLS is re-activated on this cluster. 0 U1c and later to prevent orphaned VM cleanup automatically for non-vCLS VMs. . 0. The DRS service is strictly dependent on the vCLS starting vSphere 7 U1. Enthusiast 07-11-2023 12:03 AM. 5. Reply. 0 Update 1, DRS depends on the availability of vCLS VMs. DRS is not functional, even if it is activated, until vCLS. Hi, I had a similar issue to yours and couldn't remove the orphaned VMs. Follow VMware KB 80472 "Retreat Mode steps" to enable Retreat Mode, and make sure vCLS VMs are deleted successfully. Because the METRO Storage Containers are deleted make sure they are recreated again to match the name from the. I would guess that the new vCLS VM's have something to do with this issue under the hood as of update 1, maybe not. WorkflowExecutor : Activity (Quiescing Applications) of Workflow (WorkflowExecutor),You can make a special entry in the advanced config of vCenter to disable the vCLS VMs. Back then you needed to configure an advanced setting for a cluster if you wanted to delete the VMs for whatever reason. Removed host from inventory (This straight away deployed a new vCLS vm as the orphaned vm was removed from inventory with the removal of the host) Logged into ESXi UI and confirmed that the. enabled (where 5080 is my cluster's ID. vcls. 2. When there are 2 or more hosts - In a vSphere cluster where there is more than 1 host, and the host being considered for maintenance has running vCLS VMs, then vCLS. In the vSphere 7 Update 3 release, Compute Policies can only be used for vCLS agent VMs. AssignVMToPool. Fresh and upgraded vCenter Server installations will no longer encounter an interoperability issue with HyperFlex Data Platform controller VMs when running vCenter Server 7. Only. DRS Key Features Balanced Capacity. 0 U3 (18700403) (88924) | VMware KB Click the vCLS folder and click the VMs tab. Clusters where vCLS is configured are displayed. Option 2: Upgrade the VM’s “Compatibility” version to at least “VM version 14” (right-click the VM) Click on the VM, click on the Configure tab and click on “VMware EVC”. How do I get them back or create new ones? vSphere DRS functionality was impacted due to unhealthy state vSphere Cluster Services caused by the unavailability of vSphere Cluster Service VMs. ; Use vSphere Lifecycle Manager to perform an orchestrated. 5 and then re-upgraded it to 6. In case of power on failure of vCLS VMs, or if the first instance of DRS for a cluster is skipped due to lack of quorum of vCLS VMs, a banner appears in the cluster summary page along with a link to a Knowledge Base article to help troubleshoot the. 0 U2 to U3 the three Sphere Cluster Services (vCLS) VMs . vCLS. In these clusters the number of vCLS VMs is one and two, respectively. cmd file and set a duration for the command file e. If the datastore that is being considered for "unmount" or "detach" is the. Wait a couple of minutes for the vCLS agent VMs to be deployed and. 01-22-2014 07:23 PM. When the nodes are added to the cluster, the cluster will deploy a couple of vCLS virtual machines. vcls. When you do this vcenter will disable vCLS for the cluster and delete all vcls vms except for the stuck one. When Fault Domain "AZ1" is back online, all VMs except for the vCLS VMs will migrate back to Fault Domain "AZ1". vCLS VMs from all clusters within a data center are placed inside a separate VMs and templates folder named vCLS. Shared Storage Requirements . Repeat steps 3 and 4. Do note, vCLS VMs will be provisioned on any of the available datastores when the cluster is formed, or when vCenter detects the VMs are missing. A. With the tests I did with VMware Tools upgrades, 24h was enough to trigger the issue in a particular host where VMs were upgraded. 0 Update 3 environment uses the pattern vCLS-UUID. See vSphere Cluster Services for more information. Existing DRS settings and resource pools survive across a lost vCLS VMs quorum. Log in to the vCenter Server Appliance using SSH. No need to shut down the vCLS machines - when a host enters maintenance mode they will automatically vmotion to another host. vcDr:::protectionGroup as category for the iSCSI-FreeNAS datastore will prevent vCLS VMs to be placed on it, or in case that they're already created, they will be. 0 Update 1, DRS depends on the availability of vCLS VMs. To resolve the anomaly you must proceed as follows: vCenter Snapshots and Backup. To avoid failure of cluster services, avoid performing any configuration or operations on the vCLS 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:"vSphere DRS functionality was impacted due to unhealthy state vSphere Cluster Services caused by the unavailability of vSphere Cluster Service VMs. Anyway, First thing I thought is that someone did not like those vCLS VMs, found some blog and enabled "Retreat mode". This issue is expected to occur in customer environments after 60 (or more) days from the time they have upgraded their vCenter Server to Update 1 or 60 days (or more) after a fresh deployment of. New vCLs VM names are now vCLS (1), vCLS (2), vCLS (3). 3. event_MonitoringStarted_commandFilePath = C:\Program Files\APC\PowerChute\user_files\disable. vSphere DRS remains deactivated until vCLS is. Note: After you configure the cluster by using Quickstart, if you modify any cluster networking settings outside of Quickstart, you cannot use the Quickstart. 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. 0 VMware introduced vSphere Cluster Services (vCLS). When changing the value for " config. But the real question now is why did VMware make these. It ignores the host that has the vSphere VM, which is good. DRS is used to: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. 3. Launching the Tool. Shut down 3x VM - VCLS /something new to me what it is/ 3. Only administrators can perform selective operations on vCLS VMs. We had the same issue and we had the same problem. 0U1 install and I am getting the following errors/warnings logged everyday at the exact same time. So the 1st ESXi to update now have 4 vCLS while the last ESXi to update only have 1 vCLS (other vCLS might had been created in earlier updates). VMware introduced the new vSphere Cluster Services (vCLS) in VMware vSphere 7. domain-c7. So, think of VCSA as a fully functional virtual machine where vCLS are the single core 2 GB RAM versions of the VCSA that can do the same things, but don't have all the extra bloat as the full virtual machine. xxx. Note: vSphere DRS is a critical feature of vSphere which is required to maintain the health of the workloads running inside vSphere Cluster. Description. Click Edit Settings, set the flag to 'false', and click Save. Placed the host in maintenance. Or if you shut it down manually and put the host into Maintenance Mode, it won't power back on. Enter the full path to the enable. Hello, after vcenter update to 7. All this started when I changed the ESXi maximum password age setting. Unmount the remote storage. When disconnected host is connected back, vCLS VM in this disconnected host will be registered again to the vCenter inventory. Browse to the . You can disable vCLS VMs by change status of retreat mode. It would look like this: Click on Add and click Save. clusters. If you suspect customer might want a root cause analysis of the failure later: Follow Crashing a virtual. Patent No. For example, you are able to set the datastores where vCLS can run and should run. But yes vCLS is doing some r/w data on the partitions. vmx) may be corrupt. Be default, vCLS property set to true: "config. Operation not cancellable. AndréProcedure. In These scenarios you will notice that the cluster is having issues in deploying the. tag name SAP HANA) and vCLS system VMs. Click Invoke Method. On the Virtual machines tab, select all three VMs, right-click the virtual machines, and select Migrate. Regarding vCLS, I don't have data to answer that this is the root cause, or is just another process that is also triggering the issue. 0 VMware introduced vSphere Cluster Services (vCLS). We have "compute policies" in VMware Cloud on AWS which provide more flexibility, on prem there's also compute policies but only for vCLS VMs so that is not very helpful. This will power off and delete the VMs, however it does mean that DRS is not available either during that time. ; If this is an HCI. vcls. Go to the UI of the host and log in Select the stuck vcls vm and choose unregister. 1 Solution. The vSphere Clustering Service (vCLS) is a new capability that is introduced in the vSphere 7 Update 1 release. It is a mandatory service that is required for DRS to function normally. vcls. • Recover replicated VMs 3 vSphere Cluster Operations • Create and manage resource pools in a cluster • Describe how scalable shares work • Describe the function of the vCLS • Recognize operations that might disrupt the healthy functioning of vCLS VMs 4 Network Operations • Configure and manage vSphere distributed switchesRecover replicated VMs; vSphere Cluster Operations. The ability to "hide" items. These VCLS files are now no longer marked as possible zombies. <moref id>. Configuring Graphics. ago. 5. Hey! We're going through the same thing (RHV to VMware). cmd file and set a duration for the command file e. This folder and the vCLS VMs are visible only in the VMs and Templates tab of the vSphere Client. vCLS VMs are by default deployed with a " per VM EVC " mode that expects the CPU to provide the flag cpuid. Simply shutdown all your VMs, put all cluster hosts in maintenance mode and then you can power down. OP Bob2213. 8,209,687 (“the ’687 patent”) that (1) VMware’s DRS 2. 0. Solved: Hi, I've a vsphere 7 environment with 2 clusters in the same vCenter. ini and log files to see whats going wrong. So it looks like you just have to place all the hosts in the cluster in maintenance mode (there is a module for this, vmware_maintenancemode) and the vCLS VMs will be powered off. Search for vCLS in the name column. This is solving a potential problem customers had with, for example, SAP HANA workloads that require dedicated sockets within the nodes. User is not supposed to change any configuration of these VMs. vCLS is also a mandatory feature which is deployed on each vSphere cluster when vCenter Server is upgraded to Update 1 or after a fresh deployment of vSphere 7. 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: 'Feature ‘bad. for the purposes of satisfying the MWAIT error, this is an acceptable workaround). 0 U1c and later. Few seconds later in your vSphere UI, you will see vCLS starting to turn back on! 88400 Cloud Computing cyber security servers. The vSphere Clustering Service (vCLS) is a new capability that is introduced in the vSphere 7 Update 1 release. Mark as New; Bookmark; Subscribe; Mute;Why are vCLS VMs visible? Hi, with vSphere 7. It is a mandatory service that is required for DRS to function normally. The problem is when I set the value to false, I get entries in the 'Recent Tasks' for each of the. g. It has the added benefit of shuttung down VMs in tiers, which is handy so some VMs can shutdown ahead of others. I have found a post on a third party forum that pointed my attention to the networking configuration of the ESXi host VMkernel ports. DRS will be disabled until vCLS is re-enabled on this cluster. vCLS VMs created in earlier vCenter Server versions continue to use the pattern vCLS (n). See vSphere Cluster Services for more information. n. Depending on how many hosts you have in your cluster you should have 1-3 vcls agent vms. The agent VMs are manged by vCenter and normally you should not need to look after them. Note: vSphere DRS is a critical feature of vSphere which is required to maintain the health of the workloads running inside vSphere Cluster. Within 1 minute, all the vCLS VMs in the cluster are cleaned up and the Cluster Services health will be set to Degraded. These VMs are created in the cluster based on the number of hosts present. vSphere 7's vCLS VMs and the inability to migrate them with Essentials licenses. So if you turn off or delete the VMs called vCLS the vCenter server will turn the VMs back on or re. vCLS VMs will automatically be powered on or recreated by vCLS service. Under vSphere DRS click Edit. Starting with vSphere 7. xxx. Click Edit Settings, set the flag to 'false', and click Save. enabled and value False. Click Edit Settings. tests were done, and the LUNS were deleted on the storage side before i could unmount and remove the datastores in vcenter. If you want to remove vCLS from the equation altogether, you can enable. Is there a way to force startup of these vms or is there anywhere I can look to find out what is preventing the vCLS vms from starting?. (Which is disturbing, given that even the owner of the system can't resolve issues with the. 0 U1 when you need to do some form of full cluster maintenan. vSphere DRS functionality was impacted due to unhealthy state vSphere Cluster Services caused by the unavailability of vSphere Cluster Service VMs. Reply. This person is a verified professional. 1. Retrieving Password for vCLS VMs. 06-16-2021 05:07 PM. vCLS hidden. 5 and then re-upgraded it. Click Edit Settings, set the flag to 'true', and click. domain-c7. Now assign tags to all VMs hosting databases in AG. 5 cluster also and there are now vCLS vms too. Per this VMware document, this is normal. vCLS-VMs werden in jedem Cluster ausgeführt, selbst wenn Clusterdienste wie vSphere DRS oder vSphere HA nicht auf dem Cluster aktiviert sind. The vCLS agent virtual machines (vCLS VMs) are created when you add hosts to clusters. g Unmount the remote storage. From the article: Disabling DRS won't make a difference. 2. . 0 U2 (Dedup and compression enabled vSAN) . Run lsdoctor with the "-t, --trustfix" option to fix any trust issues. The tasks is performed at cluster level. The vCLS agent VMs are lightweight, meaning that resource consumption is kept to a minimum. An unhandled exception when posting a vCLS health event might cause the. enabled to true and click Save. In such scenario, vCLS VMs. Up to three vCLS VMs must run in each vSphere cluster, distributed within a cluster. I know that you can migrate the VMs off of the. Click Edit Settings. 09-25-2021 06:16 AM. The Supervisor Cluster will get stuck in "Removing". 0U3d, except one cluster of 6. The vCenter certificate replacement we performed did not do everything correctly, and there was a mismatch between some services. Original vCLS VM names were vCLS (4), vCLS (5), vCLS (6). An administrator is responsible for performing maintenance tasks on a vSphere cluster. 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. If the host is part of a partially automated or manual DRS cluster, browse to Cluster > Monitor > DRS > Recommendations and click Apply Recommendations. 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. #service-control --stop --all. Put the host with the stuck vcls vm in maintenance mode. They form a sorting entity and behave like a logical separation. Distribute them as evenly as possible. With config. 1. If vCenter Server is hosted in the vSAN cluster, do not power off the vCenter Server VM. vcls. we are shutting. @slooky, Yes they would - this counts per VM regardless of OS, application or usage. 0. 0 Update 1, the vSphere Clustering Services (vCLS) is made mandatory deploying its VMs on each vSphere cluster. Instructions at the VMware KB-80472 below:. Note: Please ensure to take a fresh backup or snapshot of the vCenter Server Appliance, before going through the steps below. thenebular • 7 mo. For the SD cards vs DRS vCLS VMs, how can those VMs move to SD Cards? That could be true if you are creating a datastore with the free space of the. Successfully stopped service eam. . vmx file and click OK. After a bit of internal research I discovered that there is a permission missing from vCSLAdmin role used by the vCLS service VMs. Browse to a cluster in the vSphere Client. vCLS vms continuously deploying. These agent VMs are mandatory for the operation of a DRS cluster and are created. 08-25-2021 12:21 AM. ” Since all hosts in the cluster had HA issues, none of the vCLS VMs could power on. To avoid failure of cluster services, avoid performing any configuration or operations on the vCLS VMs. 04-27-2023 05:44 PM. In the case of orphaned VMs, the value for this is set to, wait for it, orphaned. Add an NVIDIA GRID vGPU to a Virtual Machine61. enabled = false it don´t delete the Machines. The number of vm's in the vCLS folder varies between 23-26 depending on when I look at it, but the. vCLS monitoring service runs every 30 seconds. g. Connect to the ESXi host managing the VM and ensure that Power On and Power Off are available. Unfortunately it was not possible to us to find the root cause. The algorithm tries to place vCLS VMs in a shared datastore if possible before. Announcing End of General Support for vSphere 6. If the host is part of an automated DRS cluster,. #python lsdoctor. View GPU Statistics60. [05804] [Originator@6876 sub=MoCluster] vCS VM [vim. On the Select a migration type page, select Change storage only and click Next. 0 U1 VMware introduced a new service called vSphere Cluster Services (vCLS). In this demo I am going to quickly show you how you can delete the vCLS VMs in vSphere/vCenter 7. Be default, vCLS property set to true: config. Troubleshooting. 23. Shared storage is typically on a SAN, but can also be implemented. For example: EAM will auto-cleanup only the vSphere Cluster Services (vCLS) VMs and other VMs are not cleaned up. When you power on VC, they may come back as orphaned because of how you removed them (from host while VC down). log shows warning and error: WARN c. Otherwise it puts vsan in maintenance mode, all the hosts in maintenance mode, then shuts them down. In an ideal workflow, when the cluster is back online, the Cluster is marked as enabled again, so that vCLS VMs can be powered on, or new ones can be created, depending on the vCLS slots determined on the cluster. In vSphere 7 update 1 VMware added a new capability for Distributed Resource Scheduler (DRS) technology consisting of three VMs called agents. Click VM Options, and click Edit Configuration. Repeat steps 3 and 4. 0 Update 1 is done. The VMs are not visible in the "hosts and clusters" view, but should be visible in the "VM and templates" view of vCenter Server. This includes vCLS VMs. 0 Update 1. MSP is a managed platform based on Kubernetes for managing containerized services running on PC. Now it appears that vCLS vms are deploying, being destroyed, and redeploying continuously. When there are 2 or more hosts - In a vSphere cluster where there is more than 1 host, and the host being considered for maintenance has running vCLS VMs, then vCLS VMs will. September 21, 2020 The vSphere Clustering Service (vCLS) is a new capability that is introduced in the vSphere 7 Update 1 release.