Insufficient vsphere ha failover resources. If this solution is not possible, consider using a different vSphere HA admission control policy, such as reserving a percentage of cluster resource for failover. Insufficient vsphere ha failover resources

 
 If this solution is not possible, consider using a different vSphere HA admission control policy, such as reserving a percentage of cluster resource for failoverInsufficient vsphere ha failover resources  I have […] Turn on, or turn off Proactive HA and then disable HA on the cluster, then re-enable HA; Verify no firewall is interfering with HA; Set Admission Control percentage to a different, low value (10% CPU/Memory) To change the Admission control please do the following : Open the Cluster; Open Config tap; Go for VSpere Availability ; Click on Edit vSphere High Availability (HA) failover resources are insufficient To resolve this problem, use similar CPU and memory reservations for all virtual machines in the cluster

I started testing failure scenarios on a 2 node vSAN cluster. 4 Click OK. Refer to the online vSphere. 0 Build 7070488, I have more than 78Gb of memory and 6Tera of harddisk. If the cluster is yellow or red, the capacity is insufficient to meet the resource reservations configured for all virtual machines and resource pools in the cluster. This option can also be set to "false", whereby the rules are not enforced. You can simulate failure of one or more hosts from a cluster (in vSphere) and identify how many: VMs would be safely restarted on different hosts. Besides writing on Yellow-Bricks, Duncan co-authors the vSAN Deep Dive book series and the. . event. I am then able to power on the virtual machine. Normally due to event "Insufficient resources to fail over this virtual machine. Hi, I have been trying to figure out why there is insufficient resources to power just one small VM in my vSphere cluster. I am then able to power on the virtual machine. 5 and VCenter appliance 6. want to guarantee failover of virtual machines. Click vSphere HA located under Services. An ESXi host fails and vSphere HA attempts to restart the VMs onto the dedicated failover hosts. This document provides best practice guidelines for designing and implementing Microsoft SQL Server (“SQL Server”) in a virtual machine to run on VMware vSphere (“vSphere”). Select an option for Define host failover. vCenter; Cluster level; Config; Vsphere availability; Uncheck box for Vsphere Availability ; OK; Enter Vsphere availability again and re-check the box; Save; Reset the warning to green Power up VMs that cannot startIn this case, vSphere HA does not fail over a virtual machine if doing so violates a rule, but it issues an event reporting there are insufficient resources to perform the failover. This is a known behavior by design and is currently being reviewed by VMware. I get an home lab with with 2 esxi hosts. Retry the operation after adjusting the resources to allow more memory. Thanks vsphere HA is turned on with response "restart VMs". Sufficient resources are available to satisfy HA failover level. The virtual machine. YELLOW Status: Insufficient vSphere HA Failover Resources Alarm (to yellow) GREEN (clear) Status:Insufficient resources to satisfy HA failover level on cluster. Not always but sometimes we tend to see an alarm on a VM "vSphere HA virtual machine failover failed". vSphere HA attempts to restart the VMs on other hosts in the cluster. How can we correct this. 0, and since I'm on more than 50% of available memory on each host, for me, it seems that I can't tolerate a single host failure. This monitor tracks the vCenter vAPI Endpoint Service Health Alarm. maxresetsThis monitor tracks the vCenter Alarm 'vSphere vCenter Host Certificate Management Mode'. Configure alarms in vCenter Server to be triggered when these actions occur, and have alerts, such as emails, sent to a specified set of. Insufficient resources to. You can also configure how vSphere HA responds if hosts lose management network connectivity with other hosts by using the host isolation response setting. Resolution. prior vSphere 5, HA had a huge dependency on the name resolution. If you have a cluster with 4 hosts and failover capacity set to 3, this means your cluster should be able to handle 3 host failures and run everything on the single node. This monitor tracks the vMon API Service Health Alarm. I don't know why it's not working anymore. By default, the alarm is triggered by the following event: vim. What happens to the VMs? A. I have cleared my cluster alarms this morning. “Insufficient vSphere HA failover resources”,` “License capacity monitoring”,` “Pre-4. Solution Check that all hosts in the cluster are healthy, that is, connected, not in maintenance mode and free of vSphere HA errors. HA. Veeam VMware: Host Network Uplink Redundancy Lost Alarm. D. To make changes to the vSAN network, you must take the following steps in the vSphere Client: . . Check whether the VMware vAPI Endpoint Service is running. md","contentType":"file"},{"name":"Set-vCenter51AlarmEmails. com Enjoy :smileyhappy:If you change the vSAN network configuration, the vSphere HA agents do not automatically pick up the new network settings. vmware. I made 4 VMs as depicted in picture. We now have a situation where the main Cluster is flagging the error; "Insufficient resources to satisfy HA failover level on cluster" The cluster has 6 hosts, there's plenty of headroom. Insufficient resources to satisfy configured failover level for vSphere HA I have two ESXi 5. md. VMware Technology Network. . 0U3j now with 5 ESXi hosts in a single cluster using 4 shared datastores for HA heartbeats, and after I patched to this version - actually, WHILE I was patching it using the VAMI, I was monitoring the console on the host the VCSA is running on and suddenly, it vanished. If this solution is not possible, consider using a different vSphere HA admission control policy, such as reserving a percentage of cluster resource for failover. This means, using vCenter HA requires 3x the storage space and more than 2x the compute resources. I tried a few different things in Admission Control tab, but even with Admission Control disabled it doesn't work. To check the reservations for VMs, I would select the Cluster in your vCenter inventory, then select the "Resource Allocation" tab. How much memory does each VM have assigned to it? - When HA calculates necessary available resources it does not look at highest peak load so far it looks at worst case scenario so lets look at your HA cluster - Lets assume your VMs have assigned 2 GB of RAM each for a total of 32 GB without a host failure you have 64. . . This behaves itself for about 1 hour and then the value for the Current Failover Capacity changes to 0 and so the "HA Insufficient resources to satisfy HA failover" alert appears even though there is 4 hosts in the cluster and working fine. "Insufficient vSphere HA failover resources". 3. vSphere High Availability (HA) failover resources are insufficient To resolve this problem, use similar CPU and memory reservations for all virtual machines in the cluster. in the Value column. "insufficient vsphere ha failover resources "they're identical nodes. 5; VMware のアドミッションコントロールを使用すると、HA スロットサイズの計算が想定と異なり、次のエラーが表示される: Insufficient Resources for HA failover "Insufficient capacity in cluster Production to satisfy resource configuration in DC" "Insufficient resources to satisfy vSphere HA failover level on cluster Production in DC" After a chat with support, they want me to disable vSphere HA, wait until that completes on both hosts, then turn it on again. 2 X Processors (8 cores each) with HT enabled. Resolutions. With the slot policy option, vSphere HA admission control ensures that a specified number of hosts can fail and sufficient resources remain in the cluster to fail over all the virtual machines from those hosts. Reason for this warning is, there is no enough resource in your cluster for fail-over. 11-02-2015 06:49 AM. There you can look at the resource settings for CPU and Memory. I am using cluster resource % (50) as recommended for vsan stretched clusters. External. This behavior, while providing the most secure failover protection for your cluster, might create issues in certain scenarios: · If you violate the failover constraints because there is a temporary, but nontrivial, time period in which there are not enough resources to. With vSphere 6. The hosts have insufficient resources. If one down, all the VM's keep working. - Triggered Alarm: Insufficient vSphere HA failover resources - Configuration issue: Insufficient resources to satisfy vSphere HA failover level on cluster. Insufficient Resources to Satisfy Configured Failover Level for HA. VMware vSphere Troubleshooting. Cannot find vSphere HA primary agent : Monitors whether vCenter Server is able to connect to a vSphere High Availability primary agent. Turn off the HA deploy VA then put HA back on -Short term solution (not recommended)B. 1 In the cluster’s Settings dialog box, select VMware HA. Best practice: Use vSphere HA-enabled clusters to deploy HCX. ; The vCenter HA Service (VMware vCenter High Availability Service) is responsible for protecting the vCenter Server Appliance against host, hardware and. This alarm will fire in vCenter, using triggers defined via the vSphere Client. Cause. . there are 2 options in cluster setting for admission control : Host failures cluster tolerates which i set that on 2 hosts. In this case, you can use the vSphere HA advanced options to reduce the slot size, use a different admission control policy, or modify the policy to tolerate fewer host failures. This is a server for exams and the supplier tells us to do so. Creating a DRS Cluster. " Not once are these actually related to a HA event or does a VM reboot. vSphere HA suspends the VMs until a host is available. Resolution. ThanksWhen you edit a DRS affinity rule, you must use vSphere HA advanced options to enforce the desired failover behavior for vSphere HA. Similarly, the Current Memory Failover Capacity is 71% ( (21GB-6GB)/21GB). When we are trying new system, everytime receive "Simplivity Battery Backup Health Error" and when enable HA after installing "Insufficient Vsphere HA failover resources" Solved! Go to Solution. Maximizing the compatibility between virtual machines and hosts in the cluster can also. . Might not necessarily mean the CPU, Mem resources all the time. When i try to start VM4 (HA) vmware won't start it, firing this error: Insufficient resources to satisfy configured failover level for vSphere. vSphere Availability 5. The available Memory resources in the parent resource pool are insufficient for the operation:A VMware vSphere Metro Storage Cluster configuration is a specific storage configuration that combines replication with array-based clustering. Resolutions. Click Admission Control to display the configuration options. If this solution is not possible, consider using a different vSphere HA admission control policy, such as reserving a percentage of cluster resource for failover. When I change admission control policy to "percentage of cluster resources reserved as failover spare capacity @ 25% cpu & 25% mem. vc. As we all are aware this should start the vMotion process but in my case it does not. 0b: 3/14/2017: Batch mode install, upgrade, and unmount for multiple virtual machines selected from a virtual machine list; Client-side checks for insufficient. I am then able to power on the virtual machine. Scenario: Cluster biews shows that vSphere DRS is imbalanced. D. vSphere HA powers down the VMs. Click the Configure tab. Click the Configure tab. 6 vsan but my cluster instantly turns to: insufficient vsphere ha failover resources even if all 3 nodes (dell r730xd with 2x10 core) are empty. "Insufficient configured resources to satisfy the desired vSphere HA failover level on the cluster" post vCenter 6. There is an issue with VMware high-availability protection for this virtual machine. vSphere High Availability (HA) failover resources are insufficient To resolve this problem, use similar CPU and memory reservations for all virtual machines in the cluster. You can reserve a percentage of Persistent Memory for Host failover capacity. Review VMware online documents such as Troubleshooting VMware High Availability and the vSphere Troubleshooting Guide to resolve HA issues. . Select vSphere Availability and click Edit. Admission control is a policy used by vSphere HA to ensure failover capacity within a cluster. . Solution: In vSphere Client select the failed FT operation in either the Recent Tasks pane or the Tasks & Events tab and click the View details link that appears in the Details column. When VMware High Availability(HA) is turned ON. 5, default admission control policy is changed to “Cluster resource Percentage”. See images below:Go to: Hosts and Clusters >cluster >edit settings> VMwareHAWhen an ESXi host fails, vSphere HA attempts to restart its virtual machines on any of the specified failover ESXi hosts. event. " Not once are these actually related to a HA event or does a VM reboot. HA initiated a failover action. Click OK. Advanced Search. Insufficient resources to satisfy vSphere HA failover. Correct Answer: D Section: (none)vSphere HA Agent Is in the Agent Unreachable State. Reply. Browse Library Advanced Search Sign In Start Free Trial. Resolution. Hi, As I understand, you are unable to unable to turn on VMs in a HA cluster. Symptoms. How vSphere HA Works. vc. Select vSphere Availability and click Edit. below is a great link to get this resolved: VMware: Fixing Insufficient resources to satisfy configured failover level for HA | geekswing. 5 and VCenter appliance 6. This fault occurs when the HA configuration of CPU or memory resources reserved for. As a result you get the following alarm in vCenter: “Insufficient vSphere HA failover resources”. Consequently, vSphere HA is not able to monitor the virtual machines on the host and might not restart them after a failure. Code: Select all vCLS-98b596cf-d0d2-4cac-a45d-f39bf856e762: vSphere HA virtual machine failover failed vSphere HA failover operation in progress in cluster Cluster1 in datacenter XXXXXX: 0 VMs being restarted, 1 VMs waiting for a retry, 0 VMs waiting for resources, 0 inaccessible vSAN VMsInsufficient configured resources to satisfy the desired vSphere HA failover levelInsufficient configured resources to satisfy. Remember that this option is not recommanded because if HA append you will need more ressource that the remaining host on the environment can take. ca 250-853-3619 BC Data & Statistics sources. When VMware High Availability (HA) is turned ON, you also have it configure so that there is a certain amount of resource reserve for failover. Actual CPU & memory usage on both hosts is negible. Review VMware online documents such as Troubleshooting VMware High Availability and the vSphere. ps1. In my example a new VM with 4GHz of CPU and 4GB of RAM was deployed. 04-02-2012 05:34 AM. For PowerStore X cluster, the recommended value is 1. Cluster Problems. Disable “EVC”. You can see the alarms have Acknowledge/Reset options, this is a. As a result you get the following alarm in vCenter: “Insufficient vSphere HA failover resources”. . Insufficient vsphere HA failover resources default alarm to be alerted when there are insufficient for vSphere HA cluster resources to ensure failover. Reason for this warning is, there is no enough resource in your cluster for fail-over. 1 hosts. name} in {datacenter. For testing we enabled maintenance mode on one of the ESXi host where the VCSA VM is running, we expect the VM to migrate (vMotion) to the other host automatically, but getting warning message saying "Insufficient vSphere HA failover resources". When I change admission control policy to "percentage of cluster resources reserved as failover spare capacity @ 25% cpu & 25% mem. Select an option for Define host failover. . Earlier today a host had an hardware issue and I saw "insufficient resources to satisfy ha failover" in vCenter where I'd have expected the other host to take over. This process seemed simple on the surface but proved quite challenging. El clu. vSphere HA Admission Control PMem Reservation;. In vSphere infrastructure, we will come across many known problems in highly available clusters. by virtual machines for failover. I have the witness appliance running in a remote datacenter. Now, I want to make a replication between of them, and to make a "failover cluster". As you can see I am using very little CPU or memory on either host. Upon further investigation of the tasks I see Unable to automatically migrate (VM) from ESXIHost1. Actual exam question from VMware's 2V0-21. 5 Update 1". Add a Virtual Machine to a Resource Pool. C. Insufficient resources to satisfy vSphere HA failover. . So as described above, the warning Running VMs utilization cannot satisfy the configured failover resources on the cluster pops up when the available unreserved memory for the VMs is approximately 0. vmware. vCLS provides a mechanism that allows VMware to decouple both vSphere DRS and vSphere HA from vCenter Server. 1 - Insufficient resources to satisfy configured failover level for vSphere HA. . By default, the alarm is triggered by the following event: vim. Resolutions. The VMware High Availability cluster has insufficient resources to guarantee failover. The ESXi version is 7. When vSphere HA performs failover and restarts virtual machines on different hosts, its first priority is the. Veeam VMware: Insufficient vSphere HA Failover Resources Alarm. Creating and Using vSphere HA Clusters 13. This way the HA is still on, and VA can be deployed. {"payload":{"allShortcutsEnabled":false,"fileTree":{"":{"items":[{"name":"LICENSE","path":"LICENSE","contentType":"file"},{"name":"README. net. For more information, see the Customizing vSphere HA Behavior section of the relevant vSphere Availability Guides: . The virtual machine violates failover when it attempts to power on. turn HA on/off didnt help admission controll is turned off, but even if i say 1 host can f. This is a server for exams and the supplier tells us to do so. The current failover level is not based on current cpu/memory usage but on the the vm reservations (ie. How vSphere HA Works. 0 Kudos All forum topics;Therefore HA will utilise the default slot size, which will be a 'false' value, as the number of VMs I can power on will be significantly lower than the number of available slots. In this example above, in that location is x ESXi hosts and one,25Tb (represents more fifty% of usage retentiveness on the cluster) of free memory and only five% of CPU usage, and however, we get this warning. Solution. . Hi everyone. 4 Click OK. First uncheck Enable VMware HA -> OK. . See vSphere Resource Management for more information on anti-affinity rules. This fault is reported when: The host is requested to enter maintenance or standby mode. Will need to check the admission control and. That makes sense about the message "insufficient resources to satisfy HA failover" that was generated, but Just wondered why the virtual machines on the ESX Server that disconnected didnt migrate to the other healthy ESX host as well. In this section, we will start investigating and understanding. 1 Solution. Cannot Configure vSphere HA When Using Custom SSL Certificates 46. Insufficient resource to satisfy vSphere HA failov. VMware Cloud Community. . Normally due to event "Insufficient resources to fail over this virtual machine. 19. When you create a vSphere HA cluster, a single. Check which configuration is enabled there. " Not once are these actually related to a HA event or does a VM reboot. vCenter; Cluster level; Config; Vsphere availability; Uncheck box for Vsphere Availability ; OK; Enter Vsphere availability again and re-check the box; Save; Reset the warning to green Power up VMs that cannot start HA must respect VM anti-affinity rules during failover-- When the advanced option for VM anti-affinity rules is set, vSphere HA does not fail over a virtual machine if doing so violates a rule. I have a total of 18 VMs in this cluster, 4 are on, the rest are off. . vSphere HA reports that an agent is in the Agent Unreachable state when the agent for the host cannot be contacted by the primary host or by vCenter Server. Normally due to event "Insufficient resources to fail over this virtual machine. Hi my friends. Allocate and optimize resources for maximum efficiency with our server management software. The problem can have the following causes: Hosts in the cluster are disconnected, not responding or are placed to the maintenance mode. Normally due to event "Insufficient resources to fail over this virtual machine. Determines if vSphere HA enforces VM-VM anti-affinity rules. When I change admission control policy to "percentage of cluster resources reserved as failover spare capacity @ 25% cpu & 25% mem. Select a number for the Host failures cluster tolerates. No further action is required. In such cases, VMware HA will use VMware DRS to try to adjust the cluster (for example, by bringing hosts out of standby mode or migrating virtual machines using vMotion to defragment the cluster resources) so that VMware HA can perform the failovers. The default value is "true" and rules are enforced even if vSphere DRS is not enabled. So what exactly has happened here. according attach pic. HA admission control policy issue "Insufficient resources to satisfy the configured failover level for HA". Insufficient vsphere HA failover resources default alarm to be alerted when there are insufficient for vSphere HA cluster resources to ensure failover. vSphere HA failover in progress : Monitors the failover progress of vSphere High Availability. For more information see Setup for Failover Clustering and Microsoft Cluster Service; Power on task hangs:. Overview: This service builds on the replication capability of vSAN and the high-availability (HA) features of VMware vSphere ® High Availability when used in a stretched cluster configuration. Review the event description for detail on the cause. Have 6 ESXi 4. Click Admission Control to display the configuration options. With the default Host Failures Cluster Tolerates policy, vSphere HA performs admission control by calculating the available slot. This monitor tracks the vCenter alarm alerting that vSphere HA failover in progress. vSphere HA failover in progress: Alarm by default to be alerted when vSphere HA is failing on virtual machines: Cannot find vSphere HA master agent:When the primary host in a VMware vSphere ® High Availability cluster cannot communicate with a secondary host over the management network, the primary host uses datastore heartbeating to determine whether the secondary host has failed, is in a network partition, or is network isolated. This information pane shows the slot size and how many available slots there are in the cluster. md","path":"README. Avoid Network Partitions. With the fix, For Dedicated host policy, vSphere HA will tolerate maximum host capacity by 5% or configured Overhead values before generating Insufficient resource message. This issue is resolved in vCenter Server 6. VMware vSphere Troubleshooting. Turn off the HA deploy VA then put HA back on . With the slot policy option, vSphere HA admission control ensures that a specified number of hosts can fail and sufficient resources remain in the cluster to fail over all the virtual machines from those hosts. Deselect the Turn On vSphere HA option. ESA Infrastructure Preperation; Invalid virtual machine configuration. Insufficient configured resources to satisfy the desired vSphere HA failover level on the cluster. VMware vSphere High Availability allows organizations to ensure high availability for VMs and applications running on the VMs in a vSphere cluster (independent of running applications). vSphere Cluster Services. vSphere HA restarts VMs in another cluster. Insufficient resources and vSphere HA failover. Toda la carga esta sobre un host. Check which configuration is enabled there. Review your VM configurations to ensure they are compatible with vSphere HA. msg}. Hi. VMware vSphere. vmware. When you use the Host Failures Cluster Tolerates admission control policy, vSphere HA clusters might become invalid (red) due to insufficient failover resources. If the service is stopped, try starting it again. english: Insufficient vSphere HA failover resources german: Nicht ausreichende vSphere HA-Failover-Ressourcen french: Ressources de basculement vSphere HA insuffisantes spanish: Ressources de basculement vSphere HA insuffisantes korean: vSphere HA 페일오버 리소스 부족. This is a safety mechanism to ensure that enough capacity is available to handle VMs from failed. Click vSphere HA located under Services. I've tried turning HA off and on again, but the alarm comes back. 2. Insufficient vSphere HA failover resources Hello everyone, First let me apologize for the length of this post. Dear all. Insufficient resources to satisfy vSphere HA failover level on cluster WYNNE in Wynne HQ. Until vSphere 6. As a result you get the following alarm in vCenter: “Insufficient vSphere HA failover resources”. Insufficient vSphere HA failover resources. vSphere HA failover in progress : Monitors the failover progress of vSphere High Availability. My two esx4 hosts are configured to use HA and DRS for the majority of my guest machines, however I have tried to reserve some cpu cycles on two guests for which I have already disabled HA and DRS as I don't want them flp-flopping between hosts. Host2: used to handle failover. HA. If is not ESXi resources or VM reservations we check if the Datastore where the VM is allocated to have enough free space. See Network Partitions. Host3: used to handle failover. i can't click play. "Insufficient vSphere HA failover resources" "Insufficient capacity in cluster Production to satisfy resource configuration in DC" "Insufficient resources to satisfy vSphere HA failover level on cluster Production in DC" After a chat with support, they want me to disable vSphere HA, wait until that completes on both hosts, then turn it on againvSphere HA is enabled on the cluster. HPE CommunityInsufficient Resources. If calculate, host 175 will cover all 3 vm's with this setting. Instead of using slot sizes, HA uses calculations to ensure that a percentage of the cluster's resources are reserved for failover. If you have a cluster with 4 hosts and failover capacity set to 3, this means your cluster should be able to handle 3 host failures and run everything on the single node. vSphere HA operates within the boundaries of a cluster. vMSC infrastructures are implemented with a goal. Deselect the Turn On vSphere HA option. If restart is not possible, for example, the failover ESXi hosts have insufficient resources or have failed as well, then vSphere HA attempts to restart the virtual machines on other ESXi hosts in the cluster. When HA's Admission Control policy is set to "Number of Host failures the cluster will tolerate", HA has a very pessimistic view of your resources, as it has to be able to handle all possibilities. D. Admission control is a policy used by vSphere High Availability (HA) to ensure failover capacity within a cluster. This fault occurs when an attempted operation conflicts with a resource configuration policy. I have configuration cluster 2 esx 3. So what exactly has happened here. 1. 1 hosts. Problem Setting up a simple vSphere 6. In my example a new VM with 4GHz of CPU and 4GB of RAM was. When you edit a DRS affinity rule, you must use vSphere HA advanced options to enforce the desired failover behavior for vSphere HA. VM {vm. “Insufficient resources to satisfy configured failover level for vSphere HA”. But, in my case, i failed to put host 176 on 'Maintenance Mode' with alert ' insufficient resources to satisfy HA failover level on cluster '. There two options in HA. ExternalVeeam VMware: vCenter License Inventory Monitoring Alarm. Default alarm to alert when vSphere HA is in the process of failing over virtual machines. HealthStatusChangedEvent: Health status of the vMon API Service changed. 5. Resolutions. Connect to the ESXi host using SSH. Insufficient resources to. 3 Enter each advanced attribute you want to change in a text box in the Option column and enter a value. Admission control is set to 1 host failure toleration. I have AC set for cluster resource percentage, 5% and 5%, and still get "Insufficient configured resources to satisfy the desired vSphere HA failover level on cluster" I use HA all the time in other environments never seen these issue before. vSphere HA failover in progress: Alarm by default to be alerted when vSphere HA is failing on virtual machines: Cannot find vSphere HA master agent:If VXR014030 warning appears on any host stop and then restart HA. When VMware High Availability(HA) is turned ON. Refer to the online vSphere Availability Guide for. The amount of cluster resources has increased, then has got back to normal and now satisfies the configured HA failover level. event. Tắt tính năng HA. Hola, tenemos Vsphere Server 5 Essentials. Insufficient resources to satisfy vSphere HA failover. Causes. " Not once are these actually related to a HA event or does a VM reboot. External. vSphere HA Provides Rapid Recovery from Outages 9 vSphere Fault Tolerance Provides Continuous Availability 11 Protecting the vCenter Server Appliance with vCenter High Availability 11 Protecting vCenter Server with VMware Service Lifecycle Manager 12. vSphere HA Admission Control is responsible for this. These solutions are typically deployed in environments where the distance between data centers is limited, often metropolitan or campus environments. The particular virtual machine might be one that is not receiving its reservation. md. A virtual machine in a vSphere HA cluster is reported as vSphere HA unprotected although it has been powered on for several minutes. vSphere HA will retry the failover. I tried a few different things in Admission Control tab, but even with Admission Control disabled it doesn't work.