What is the HA and DRS?

What is the HA and DRS?

What is the HA and DRS?

VMware HA and DRS are each able to provide availability for VMs. The main difference between the two technologies is that VMware designed DRS to work in clustered environments, while HA enables admins to protect their VMs without having to deal with the cost or complexity of a failover cluster.

What is VMware DRS cluster?

VMware vSphere® Distributed Resource Scheduler™ (DRS) is the resource scheduling and load balancing solution for vSphere. DRS works on a cluster of ESXi hosts and provides resource management capabilities like load balancing and virtual machine (VM) placement.

Does VMware HA require DRS?

The Requirement s for VMware HA You need to have VMware DRS enabled for better functionality of HA. In case you are using vCenter, make sure that you are on vCenter Server 5.5 or above. The VMware HA will need you to have your vSphere ESXi cluster virtual machines on the shared storage.

How does VMware DRS work?

VMware DRS runs within the VMware vCenter Server to automatically balance the memory load on all virtual machines within a cluster. DRS intelligently allocates resources and can be configured to automatically take care of workload Migration (with VMotion) or assign migrations based on rules defined by an administrator.

Will Drs work if vCenter is down?

VMware DRS dynamically balances computing capacity across ESXi hosts (DRS) or between datastores (Storage DRS). As DRS relies on vMotion/Storage vMotion and vCenter calculates a correct balance – DRS does not work when vCenter is down. All VMs configured (protected) by FT before vCenter outgate is safe.

How do I enable DRS?


  1. Browse to the cluster in the vSphere Client.
  2. Click Configure.
  3. Under Services, select vSphere DRS and click Edit.
  4. Select the Turn ON vSphere DRS and Turn on vSphere HA check boxes.
  5. Click OK.

What is a DRS rule?

With an anti-affinity rule, DRS tries to keep the specified virtual machines apart, for example, so that when a problem occurs with one host, you do not lose both virtual machines.

What is HA DRS and FT in VMware?

Using vSphere HA with Distributed Resource Scheduler (DRS) combines automatic failover with load balancing. This combination can result in a more balanced cluster after vSphere HA has moved virtual machines to different hosts.

How do I enable DRS in cluster?

How do I run Drs manually?

Step 1: Click Home->vCenter->Hosts and Clusters. From the “Lab Cluster” inventory object, click “Monitor” and click on the “vSphere DRS” tab. Click on the “Run DRS Now” button.

How to enable vSphere ha and DRS in a cluster?

All hosts that are running MSCS virtual machines can be part of a vCenter Server cluster with both vSphere HA and vSphere DRS enabled. You can enable vSphere HA and vSphere DRS in the Cluster Settings dialog box. Browse to the cluster in the vSphere Client.

What does ha mean in a VMware cluster?

A VMware HA cluster consists of a logical grouping of two or more VMware ESX hosts that enable high-availability services to a collection of virtual machines. In an HA cluster, each VMware ESX Server maintains an HA agent that continuously monitors a heartbeat with the other hosts in the cluster.

What are the features of a DRS cluster?

Main DRS clustering features are Load Balancing, Distributed Power Management, and Affinity Rules. Load Balancing is the feature that optimizes the utilization of computing resources (CPU and RAM). Utilization of processor and memory resources by each VM, as well as the load level of each ESXi host within the cluster, is continuously monitored.

When to use VMware HA and Drs planning?

However, VMotion is not a component of HA because VMotion requires a coordinated handoff between two physical ESX Server hosts, and VMware HA applies only when one or more ESX Server hosts have failed and not shut down in an orderly fashion.