VMware, Inc. vSphere-HA folder, vSphere HA configuration fails for the entire cluster. When vSphere HA or Fault Tolerance take action to maintain availability, for example, a virtual machine failover, you can be notified about such changes. Click Failures and Responses and then expand Host Failure Response. vSphere HA is failed over the operation in progress in the cluster in data center. 0 or later version. The web page explains the problem and solution of the configuration issues warning message "vSphere HA initiated a virtual machine failover action" or "HA. vSphere HA is failed over the operation in progress in the cluster in data center. x (2004401). Earn Credits. When I create a 2-node HA Cluster, is this possible to be handled with two physical mashine. The message cannot be removed. Review the event description for detail on the cause. 1 introduces the following new features and enhancements: vSphere Update Manager build recommendations for vSAN. 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 startkb. Cluster. To ensure successful remediation on a 2-node cluster, disable HA on the cluster or place the hosts in maintenance mode manually and then perform remediate the two host in the cluster. name} in datacenter {datacenter. You. VMware vSAN 6. 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. How can I get rid of this error? vSphere HA failover operation in progress in cluster TGCSNET-Vcenter1-Cluster in datacenter Datacenter-TGCSNET: 0 VMs being restarted, 5 VMs waiting for a retry, 0 VMs waiting for resources, 0 inaccessible vSAN VMs. After you dismiss the Cluster quickstart workflow, you cannot restore it for the current cluster. Submit and view feedback for. Is this bug back, what am i missing. If the slot size appears too high, click on the Resource Allocation tab of the cluster and sort the virtual machines. VxRail: "vSphere HA failover in progress" warning message seen in vSphere Web client. Resolution. 0 we are using vSphere 6. HA does not allow the operation. A dialog offers you the option to force a failover without synchronization. Hyper-V Failover Cluster With PRO. vSphere HA is a cluster-level feature that can be enabled to increase total availability of VMs inside the cluster and works whenever an ESXi host has been crashed, then HA will move VMs of that failed host to another available resources inside the cluster and reboot them in the new hosts. With dedicated failover hosts admission control, when a host fails, vSphere HA. Step 6: Try to delete the datastore again. Cause. HA. The failed VM stays disconnected until the host is rebooted and back online đ It doesnt get reconnected or restarted on another host. Cluster Configuration Issue: vSphere HA failover operation in progress in cluster <cluster-name> in datacenter <datacenter-name>: 0 VMs being restarted, 1 VMs waiting for a retry, 0 VMs waiting for resources, 0 inaccessible vSAN VMs. 7 DRS HA Cluster How can I get rid of this error? vSphere HA failover operation in progress in cluster TGCSNET-Vcenter1-Cluster in datacenter Datacenter-TGCSNET: 0 VMs being restarted, 5 VMs waiting for a retry, 0 VMs waiting for resources, 0 inaccessible vSAN VMs Thank you. After failures are detected, vSphere HA resets virtual machines. In the left pane of the Cluster Settings dialog box, select VM Monitoring. Prerequisites for Upgrading vCenter Server High Availability Environments To ensure a successful upgrade of vCenter Server in a high availability (HA) environment, your environment must meet certain prerequisites before running the upgrade. Review the vRealize Operations Sizing Guidelines for more information. How can I get rid of this error? vSphere HA failover operation in progress in cluster TGCSNET-Vcenter1-Cluster in datacenter Datacenter-TGCSNET: 0 VMs being restarted, 5 VMs waiting for a retry, 0 VMs waiting for resources, 0 inaccessible vSAN VMs. All You can configure vSphere HA to designate specific hosts as the failover hosts. For more information, see the How vSphere HA works section in the vSphere Availability Guide. For now, donât activate any of the clusterâs features (HA, DRS). How can I get rid of this error? vSphere HA failover operation in progress in cluster TGCSNET-Vcenter1-Cluster in datacenter Datacenter-TGCSNET: 0 VMs being restarted, 5 VMs waiting for a retry, 0 VMs waiting for resources, 0 inaccessible vSAN VMs. After a vSAN cluster fails with a loss of failover quorum for a virtual machine object, vSphere HA might not be able to restart the virtual machine even when the cluster quorum has been restored. In the event that one host fails and goes offline, HA will initiate a restart of the VM on the second host utilising the same set of files as before. Right-click the cluster name in the Navigator pane. 1 Solution Troy_Clavell Immortal 02-14-2012 11:51 AM are you running vCenter5 by any chance? If so, check your alarms. . Step 2: vSphere HA is turned ON, toggle vSphere HA to OFF and wait for all hosts to complete unconfigured for HA. Select the vCenter Server in the left hand pane. HA. vSphere HA is failed over the operation in progress in the cluster in data center Cause . Search for events with vSphere HA in the description. I have a cluster consisting of two ESXi hosts. 5. The minimum NIC speed should be 1GbE. 0 Update 3 there has been the following reported issues. VxRail: "vSphere HA failover in progress" warning message seen in vSphere Web client. Reboot the Passive node. Select cluster object. If the Active node recovers from the failure, it becomes the Active node again. vSphere HA host status Hello Team, I see more often that on vSphere HA failover in progress on vSphere Cluster, as a workaround disabling/enabling HA will fix the issue. also vms are reporting. You can deploy a Supervisor on vSphere Zones to provide high-availability to your workloads at cluster level as one vSphere Zone maps to one vSphere cluster. The Test and Recovery operations fail if a vSAN stretched cluster has. Recent Posts. 0 or later. 5 is protected against multiple types of hardware and software. Cause. vSphere HA is failed over the operation in progress in the cluster in data center. Steps to fix vSphere HA failover operation in progress issue - YouTube. Wait for HA to unconfigure, click Edit and check Turn ON vSphere HA. Click Edit near vSphere HA that is turned off in our case. Dear VMware Community, I have a single vCenter Server v7. HA. Using the vSphere Web Client. vSphere HA failover in progress : Monitors the failover progress of vSphere High Availability. Then I turned on HA on this cluster. Select vSphere Availability in the Services section of the Configure page for your cluster. Place orders quickly and easily; View orders and track your shipping status; Enjoy members-only rewards and discounts; Create and access a list of your products Updated on 08/23/2022. How to remove VMware error Message - HA Failover operation in ProgressSUBSCRIBE & CLICK THE BELL! My Socials: Julius D. R not enough resources to satisfy the Vsphere HA failover the cluster level. VxRail: "vSphere HA failover in progress" warning message seen in vSphere Web client . In the vSphere Web Client, browse to the data center where you want the cluster to reside and click New Cluster. 00100-17920168-patch-FP. Run the following command. . For Manual Deployment, nodes are not created automatically. Such a configuration can cause network failure and disrupt vSAN internode communication, while vSphere HA internode communication remains unaffected. To use vSphere HA with vSAN, you must be aware of certain considerations and limitations for the interoperability of these two. In Windows Server 2012, Task Scheduler is integrated with Failover Clustering to allow the administrator to configure clustered tasks. 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. Select Advanced Options Option1: Configure a vSphere HA Isolation address. If a node fails, the server cluster transfers the groups that were being hosted by the node to other nodes in the cluster. Place orders quickly and easily; View orders and track your shipping status; Enjoy members-only rewards and discounts; Create and access a list of your products The vmware cluster is complaining with the amber triangle 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 VMs In 6. The HPE Simplivity Stretched Cluster solution works in cooperation with vSphere HA and vSphere DRS to ensure that when one or more HPE OmniStack System failures occur in a physical location, guest virtual machines can be restarted in a second location. After the failover, you can verify that the Passive node has the role of the Active node in the vSphere Client. vmware. TomHA. To do this you need to create another cluster as a test. As a result, VMware vSphere HA is configured to tolerate the failure of a single host. Click Advanced Options. This configuration signals the VMware vSphere cluster to reserve the necessary resources, such as CPU and memory, in order to accommodate all the virtual machines that were running on the failed. vSphere HA provides high availability for virtual machines by pooling the virtual machines and the hosts they reside on into a cluster. ConnectedToMaster :. AndréThe solution of this warning is to turn OFF and turn ON the vSphere HA feature as follows: 1. A vSphere Lifecycle Manager image is a combination of vSphere software, driver software, and desired firmware with regard to the underlying host hardware. 1 Kudo tdubb123. 5 host with 8 VMs running, we do a power reset from HP ilo, all the VM´s are migrated to other hosts succesfully after some minutes but there is a message displayed in vCenter Server, the message is: "VMs awaiting a retry: a previous restart attempt failed, and vSphere HA. Click OK. Another option would be to change the Admission Control policy in the HA Cluster settings to "Percentage of resources reserved for failover". @Rasulzade There is no impact to VMs when disabling and enabling HA. Run the following command. VMware HA provides a way to minimize virtual machine downtime in the event of a hypervisor (ESXi) host failure. 60GHz with 32 cores each for a total of 64 logical processors. Thank you. Deselect the Turn On vSphere HA option. HA initiated a failover action. Reason: The operation is not allowed in the current state. In the Home screen, click Hosts and Clusters. HA. we are doing vSphere HA tests in our infrastructure, in a ESXi 5. Using the vSphere Web Client. Cause. The health alert will clear and the task will progress when transient capacity is available. Not enough resources for vSphere HA to start VM. 0 components. VxRail: "vSphere HA failover in progress" warning message seen in vSphere Web client. However, automatic failover is deactivated. In the vCenter GUI, use the Hosts and Clusters view, Right-click the ESXi host and select Connection > Disconnect. 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. Click OK and wait for the cluster to reconfigure. The formula used to determined by the use of "slots". To disable/enable the vSphere HA in the vSphere Web Client:During remediation, the hosts in the cluster are remediated in sequence by default. After resolving network partition, some VM operations on linked clone VMs might failHA Cluster Introduction Part 4: How to continue operations by failover;. disabled. These clusters are running SQL server with the idea of HA for availability. With HA, vSphere can detect host failures and can restart virtual machines. VxRail: "vSphere HA failover in progress" warning message seen in vSphere Web client. x, HA is provided by the Fault Domain Manager (FDM) agent deployed on each of the HA cluster hosts. To ensure successful remediation on a two-node cluster, you must deactivate HA for the cluster or place the hosts in maintenance mode manually and then remediate the two hosts in the cluster. When trying to enable HA, the installation of the HA agent (FDM) starts, and the status switches into "Waiting for cluster election to complete", only to fail and start over again. Key benefits. Thank you. If the host is in a Not Responding state, there is a network problem or a total cluster failure. Resolution. Overview: This service builds on the replication capability of vSAN and the high-availability (HA) features of VMware vSphere ÂŽ High Availability when used in a stretched cluster configuration between two data centers. 0 Availability Guide. Automatic failover The Passive node attempts to take over the active role in case of an Active node failure. Using the vSphere Web Client. vSphere HA virtual machine failover unsuccessful. vcha. My advice would be to make sure there are no long running tasks on a. 2CPUs at 2. vSphere HA is failed over the operation in progress in the cluster in data center. If the Active node recovers from the failure, it becomes the Active node again. I'm trying to configure vCenter HA in two separate clusters. Select the affected cluster at which the removal of the host is failing 3. Step 7: If you disabled vSphere HA, re-enable it. To configure your cluster host networking and services manually by referring to different parts of the vSphere software, click the Skip quickstart button. Cause. 5, the vCenter High Availability feature was introduced. Using the vSphere Web Client. 1. You can configure confidential vSphere Pods by adding. vSphere HA virtual machine failover failed. Using the vSphere Web Client. To disable/enable the vSphere HA in the vSphere Web Client:"vSphere HA failover operation in progress in cluster CGI_Test_Cluster in datacenter Bremen: 1 VMs being restarted, 1 VMs waiting for a retry, 0 VMs waiting for resources, 0 inaccessible vSAN VMs". Patch for VMware vCenter Server Appliance 7. How can I get rid of this error? vSphere HA failover operation in progress in cluster TGCSNET-Vcenter1-Cluster in datacenter Datacenter-TGCSNET: 0 VMs being restarted, 5 VMs waiting for a retry, 0 VMs waiting for resources, 0 inaccessible vSAN VMs. And then click. Cluster. This time, We explained the mechanism of "Application take over due to failover". Both hosts will see the shared volume and have visibility of the VM files. No impact. The alert is typically seen when a host failure occurs, and vSphere HA attempts to restart a VM that is already powered off. If there is only one vSphere HA-enabled host, an operation is not allowed, even if there is a sufficient percentage of resources available. As you can see in the screenshot above, the wizard looks quite similar in both management clients. Resolution. If a virtual machine does not have reservations, meaning that the reservation is 0, a default of 0MB memory and. Symptoms. ConnectedToMaster: ExtendedEvent: Host connected to a vSphere HA master: com. Product Patch for vCenter Server containing VMware software fixes, security fixes, and third-party product fixes. In the vSphere Client, browse to select the relevant vSphere HA cluster. W. Reference In the Home screen, click Hosts and Clusters. With VMware vSphere Replicationâ˘, quiescing of the virtual machine might fail, but replication continues and notifications will be observed in the VMware vSphere Web Client. vSphere Cluster HA provides high availability for virtual machines by pooling the virtual machines and the hosts they reside on into a cluster. 11-15-2012 06:24 AM. Create a vSphere HA cluster for VMware VM failover step by step. During HA failover, we are able to access our VMS & Hosts, then why its occurring?. Using the vSphere Web Client. Stretched clusters require on-disk format 2. Details VMware High Availability (HA) failover errors: HA agent on server in cluster cluster in datacenter has an error Insufficient resources to satisfy HA failover. Disable vCenter HA : Deactivates replication and failover. In the Summary tab, click Edit Settings. If either site fails, vSAN uses the storage on the other site. Below are other key benefits of the solution. TomCluster config Issue: vSphere HA initiated a failover action on 1 virtual machines in cluster LabCluster on datacenter DC01. Under Settings select vCenter HA and click Initiate Failover. It is important to understand and weigh the cost of the extra resources to the benefits that HA provides. There are specific alarms to HA. Cause. > Bind Device. Cause. VxRail: "vSphere HA failover in progress" warning message seen in vSphere Web client. Use HA with Host Failure Monitoring, Admission Control, and set FTT to the number of hosts in each site. Cluster Configuration Issue: vSphere HA failover operation in progress in cluster <cluster-name> in datacenter <datacenter-name>: 0 VMs being restarted, 1 VMs waiting for a retry, 0 VMs waiting for resources, 0 inaccessible vSAN VMs Place orders quickly and easily; View orders and track your shipping status; Enjoy members-only rewards and discounts; Create and access a list of your products Requirement: The management servers are pinned to a specific data center but can be failed over to a second data center in the event of an outage. Unfortunately there is no option to remove or acknowledge the message. Complete the New Cluster Wizard. These are new HPE DL380 servers. Cause. VMware High Availability failover virtual machines to other available hosts. Cluster. vSphere HA is failed over the operation in progress in the cluster in data center. Using the vSphere Web Client. If your vSphere inventory configuration uses a folder to store the NetApp HCI cluster within the vCenter datacenter, some operations, such as expanding NetApp HCI compute resources, will fail. Edit the Properties of the availability group and set Failover Mode to Automatic in all replicas. Resolution. For continued operation after the evaluation period, you need to obtain a new license key from VMware and add it to the vCenter Server license inventory. When you create a vSphere HA cluster, a single. HA determines the current failover capacity of the cluster, which is the number of hosts that can fail and still leave enough slots to satisfy all the powered-on virtual machines. The failed VM stays disconnected until the host is rebooted and back online đ It doesnt get reconnected or restarted on another host. The Skip Quickstart button prompts you to continue configuring the cluster and its hosts manually. you can remove and re-add the host to the cluster. What is vSphere Cluster Services (vCLS) vSphere Cluster Services (vCLS) is a new feature in vSphere 7. Restarting VMs on different ESXi hosts is possible because the HA cluster has shared storage that maintains virtual machine disk (VMDK) files accessible to all the. In vSphere 5. vSphere HA failover in progress : Monitors the failover progress of vSphere High Availability. x /8. Resolution. Unselect Turn on vSphere HA, if it is selected. vSphere HA is failed over the operation in progress in the cluster in data center. Reduce Planned Downtime with vSphere. In the vSphere Web Client, the same notification can be found by selecting the referenced data center and navigating to Issues under the Monitor tab. vSphere Availability describes vSphere HA functionality. You must designate one site as the preferred site. 1. You can manually initiate a failover and have the Passive node become the Active node. Select Enable VMware HA. regards, maryYou can configure vSphere HA to designate specific hosts as the failover hosts. To disable/enable the vSphere HA in the vSphere Web Client:1. Solution. Since the release of vSphere 7. Cause. Reduce the planned downtime for common maintenance operations. Click OK to close the wizard and create an empty cluster. Requirement: The management servers are pinned to a specific data center but can be failed over to a second data center in the event of an outage. Click Settings in the context menu. Step 2: Create a cluster. Disable, then re-enable vSphere HA for the cluster per Configuring vSphere Availability Settings. 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. Hosts in the cluster are monitored and in the event of a failure, the virtual machines on a failed host are restarted on alternate hosts. Based on your plan for the resources and networking architecture of the cluster, use the vSphere. . Download Filename. 5, we will investigate whether we use it for the VxRail vCenter. Thank you. If a virtual machine does not have reservations, meaning that the reservation is 0, a default of 0MB memory and. You see an alarm indicating: vSphere HA failover in progress in Cluster No VMs are actually failed over No issues are noted in Horizon or with the ESXi hosts HA Master host's FDM service may stop. With the default Host Failures Cluster Tolerates policy, vSphere HA performs admission control by calculating the available slot. To activate HA, you must have at least one data node deployed, in addition. The VMs are deleted from vSphere before they are unprotected from HA, resulting in vCenter issuing a false failover alarm. vCenter High Availability (vCenter HA) protects the vCenter Server Appliance against host and hardware failures. Resolution. The vSphere Clustering Service (vCLS) is a new capability that is introduced in the vSphere 7 Update 1 release. VxRail: "vSphere HA failover in progress" warning message seen in vSphere Web client. To enable HA repeat the above steps and select Turn on VMware HA option. Depending on the type of failure detected, the virtual machines running on the hosts might need to be failed over. HA. Click Edit (upper right). Determine whether the virtual machine network adapters are connected to a corresponding port group. Using the vSphere Web Client. This part will introduce the detailed steps to create an efficient vSphere High Availability. 3. Tom vSphere HA virtual machine failover in progress alarm is reported to a powered off VM after scheduled host replacement completed: vSphere HA failover in progress vSphere HA failover operation in progress in cluster Cluster-1 in datacenter SDDC-Datacenter: 0 VMs being restarted, 1 VMs waiting for a retry, 0 VMs waiting for resources, 0. Select Cluster Features and then in the right pane. Cluster How can I get rid of this error? vSphere HA failover operation in progress in cluster TGCSNET-Vcenter1-Cluster in datacenter Datacenter-TGCSNET: 0 VMs being restarted, 5 VMs waiting for a retry, 0 VMs waiting for resources, 0 inaccessible vSAN VMs Thank you TomHigh Availability allows you to: Monitor VMware vSphere hosts and virtual machines to detect hardware and guest operating system failures. After the failover finishes, you must restart the remediation task on the new node. Table 1. How vSphere HA Works. Steps to fix vSphere HA failover operation in progress issue. In the vSphere Client, browse to the vSphere HA cluster. 02-07-2012 01:00 PM. Every task is written twice. Refer to the errors list for details. Thank you. For details please see vSphere Availability. Once all Hosts have been unconfigured for HA, check "Turn on VMware HA". When the deployment finishes, vCenter Server has high availability protection. Workloads that you run on a Supervisor deployed on zones are distributed on the vSphere clusters that are part of the zones and are protected against cluster-level failure. To disable/enable the vSphere HA in the vSphere Web Client:VxRail: "vSphere HA failover in progress" warning message seen in vSphere Web client. In the vSphere Client, click Menu and select Hosts and Clusters. To disable/enable the vSphere HA in the vSphere Web Client: Log in to the vSphere Web Client. HA uses the actual reservations of the virtual machines. Refer to the online vSphere Availability Guide for. HA initiated a failover action. To disable/enable the vSphere HA in the vSphere Web Client:"vSphere HA failover operation in progress in cluster CGI_Test_Cluster in datacenter Bremen: 1 VMs being restarted, 1 VMs waiting for a retry, 0 VMs waiting for resources, 0 inaccessible vSAN VMs". Running ESXi 6. Then re-enable vSphere HA. Default vSphere alarms are set on the vCenter Server level and propagated to all child objects in the inventory. Thanks! 02-07-2012 01:36 PM. once DNS is confirmed, you can reinstall the HA agents by right clicking the Cluster --> edit settings --> Uncheck DRS/HA checkboxes --> OK. Reply. . vSphere HA is failed over the operation in progress in the cluster in data center. Conclution. This problem is caused by the dependency on VMware HA being available for normal operation of stretched cluster sites. Cluster Configure tab . The failed VM stays disconnected until the host is rebooted and back online đ It doesnt get reconnected or restarted on another host. With the resources failover policy in place, vSphere HA uses the following calculations to control virtual machine migration in the cluster. vSphere HA is failed over the operation in progress in the cluster in data center. In addition, the vSphere HA agent on the Primary VMâs host must be operating correctly. May 25, 2021 · A failover will promote the vCenter HA PassiveClustering on vSphere High Availability. When you add a host to a vSphere HA cluster, an agent is uploaded to the host and configured to communicate with other agents in the cluster. Insufficient vSphere HA failover resources vSphere 7. Cause. For enabling HA at the cluster level, refer to Configure vCenter HA With the vSphere ClientFDM does not require that DNS be configured on the hosts, nor does FDM rely on other Layer 3 to 7 network services. HA. Protecting vCenter Server with vCenter High Availability. The Cluster quickstart page appears. If you select Disabled, this setting turns off host monitoring and VMs are not restarted when host failures occur. TomThis monitor tracks the vCenter alarm alerting that vSphere HA failover in progress. Keeps the configuration of the cluster. To disable/enable the vSphere HA in the vSphere Web Client:Verify that VMware HA is only attempting to configure on one Service Console. See VMware online documents such as Troubleshooting VMware High Availability and the vSphere Troubleshooting Guide to resolve HA issues. Resolution. We've had some ESXi hosts PSOD a few times. Select Cluster-1. To enable HA repeat the above steps and select Turn on VMware HA option. vmware. Select your cluster, Hosts and Clusters. 4. vSphere HA failover operation in progress in cluster MNS-Cluster in datacenter Rosebelle-DC: 0 VMs being restarted, 1 VMs waiting for a retry, 0 VMs waiting for resources, 0 inaccessible vSAN VMs Steps to fix vSphere HA failover operation in progress issue After a HA failover event you see a warning message for a cluster in your vCenter Server/webclient: âHA initiated a failover on. Disable, then re-enable vSphere HA for the cluster per Configuring vSphere Availability Settings. Installing the VMware vCenter Server root CA⌠Video: HOW TO: Configure and Test SNMPv3 on⌠ESXi support for Intel iGPU with SR-IOVLink is expired, anyone can help? I have the same issues now. We're running vCenter 7. Proceed to. In the Home screen, click Hosts and Clusters. Activate vSphere HA. 5, currently we are facing one problem in our Cluster its showing ''Insufficient resources to satisfy HA failover level on cluster ''. Hosts in the cluster are monitored and in the event of a failure, the virtual machines on a failed host are restarted on alternate hosts. Cause. 4 Kudos. vSphere ® supports clustering using MSCS across virtual machines. If you dismiss the Cluster quickstart workflow. Using the vSphere Web Client. Read this post to learn how you can deploy a cluster and configure HA in VMware vSphere. Deselect the Turn On VMware HA option. Monitors the sufficiency of failover cluster resources required for vSphere High Availability. Click OK. Using the vSphere Web Client. If you plan to enable vSphere High Availability (HA), vSphere. Uncheck âPower on the virtual machine after recoveryâ in the last step of the recovery wizard. vSphere HA failed to restart a.