Will Restarting vCenter Affect VMs? Exploring the Impact and Best Practices

Discover the impact of restarting vCenter on VMs and learn best practices to minimize disruptions. This article explains the relationship between vCenter and VMs, provides guidance on preparing for a vCenter restart, outlines steps to restart vCenter with minimal VM impact, and offers tips for monitoring VMs post-restart.


By Zelia / Updated on January 11, 2024

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Impact of Restarting vCenter on VMs

When considering a vCenter restart, it's essential to understand how it can affect VMs in your environment.


Understanding the relationship between vCenter and VMs

vCenter acts as the management layer for VMs, providing a centralized platform for tasks such as resource allocation, configuration management, and monitoring. It acts as a bridge between the physical infrastructure and the virtual environment, facilitating smooth communication and coordination.

Potential effects of vCenter restart on VM availability and performance

Restarting vCenter can have a temporary impact on VM availability and performance. During the restart process, the vCenter services and management functionalities become temporarily unavailable, which can affect VM management operations.

Preparing for vCenter Restart

To ensure a smooth vCenter restart with minimal impact on VMs, proper planning and preparation are crucial.

Importance of planning and communication

Before initiating a vCenter restart, it is essential to communicate the maintenance activity to relevant stakeholders, including system administrators and users. This helps manage expectations and minimize surprises.

Best practices for minimizing disruptions during vCenter restart

To minimize disruptions during a vCenter restart, consider the following best practices:

1. Ensure you have a documented restart plan that outlines the necessary steps and contingencies.

2. Schedule the restart during a maintenance window or a period of low VM activity.

3. Verify that all critical VMs have high availability features enabled, such as VMware High Availability (HA) or Fault Tolerance (FT).

Steps to Restart vCenter with Minimum VM Impact

To restart vCenter with minimal impact on VMs, follow these steps:

1. Properly Shutting Down and Restarting vCenter Server

  • Gracefully shut down vCenter services and ensure all active tasks are completed.
  • Restart the vCenter server using the appropriate method based on your environment.

2. Ensuring High Availability and Redundancy of vCenter Components

  • Deploy vCenter Server in a highly available configuration using vCenter Server High Availability or other methods.
  • Leverage vSphere Distributed Resource Scheduler (DRS) to ensure vCenter components are distributed across multiple hosts.

Monitoring VMs after vCenter Restart

After the vCenter restart, monitor the VMs to ensure they are functioning properly.

Verifying VM connectivity and functionality

  • Check VM connectivity to the network and verify that IP addresses and network configurations are intact.
  • Validate VM functionality by performing tests or accessing critical services running inside the VMs.

Addressing any post-restart issues promptly

If any issues ariseduring or after the vCenter restart, address them promptly to minimize disruptions. Troubleshoot the issues systematically, involving relevant support resources if needed.

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1. Access the restore feature in AOMEI Cyber Backup:

Open the AOMEI Cyber Backup software and navigate to the restore section.

2. Select the backup source:

  • Choose the backup source from where you want to restore the VMs.
  • This could be a local disk, network share, or cloud storage.

3. Choose the VMs to restore:

Browse through the available backups and select the VMs you want to restore.

4. Specify the restore destination:

Determine the location where you want to restore the VMs, such as the original location or a different datastore.

5. Configure restore settings:

Select the appropriate restore options, such as restoring specific files or folders, restoring to a different location, or overwriting existing VMs.

6. Initiate the restore process:

  • Review the restore settings to ensure they are correct.
  • Start the restore process and monitor the progress.


Restarting vCenter is a necessary maintenance activity in VMware environments, but it's essential to understand its potential impact on VMs. By following best practices, including proper planning, communication, and utilizing high availability features, you can minimize disruptions during the vCenter restart process. Monitoring VMs post-restart and addressing any issues promptly ensures the smooth functioning of your virtual infrastructure. Remember to consider the specific requirements and configurations of your environment to ensure a successful vCenter restart with minimal impact on your VMs.

Zelia · Editor
Zelia is an editor from AOMEI Technology.She mainly writes articles about virtual machine. Writing is one of her hobbies and she wants her articles to be seen by more people. In her spare time, she likes to draw and listen to music, and it is a pleasure for her to focus on her own world.