What is DRS in ESXi host?

What is DRS VMware?

VMware vSphere Distributed Resource Scheduler (DRS) is a feature included in the vSphere Enterprise Plus. Using DRS, you can: Improve service levels by guaranteeing appropriate resources to virtual machines. Deploy new capacity to a cluster without service disruption.

What is vSphere HA and DRS?

The most common types of VMware vSphere clusters are High Availability (HA) and Distributed Resource Scheduler (DRS) clusters. HA clusters are designed to provide high availability of virtual machines and services running on them; if a host fails, they immediately restart the virtual machines on another ESXi host.

What is the difference between VMotion and DRS?

DRS uses VMotion capabilities to allow multiple physical ESX servers to be grouped as one resource pool of memory and CPU. This allows virtual instances within a DRS cluster to be dynamically moved between the members of the DRS cluster to balance resource usage with no downtime to the virtual instances.

What is a DRS rule?

Used to specify affinity or anti-affinity between a group of virtual machines and a group of hosts. … 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.

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What is DRS and how do we configure it?

DRS compares these metrics to an ideal resource usage given the attributes of the cluster’s resource pools and virtual machines, the current demand, and the imbalance target. DRS then provides recommendations or performs virtual machine migrations accordingly.

What are the prerequisites of HA and DRS?

VMware HA configuration prerequisites

DNS resolution: All ESX/ESXi hosts that are members of the HA cluster must be able to resolve one another using DNS. Access to shared storage: All hosts in the HA cluster must have access and visibility to the same shared storage; otherwise, they would have no access to the VMs.

Does HA require vMotion?

VMware HA and vMotion are two interwoven processes; VMware HA is dependent on vMotion. The technology of the migration process is designed so that there is no downtime and the user does not even notice these actions.

What is the difference between HA and FT?

Within VMware, FT ensures availability by keeping VM copies on a separate host machine. With only HA configured, the hypervisor attempts to restart the VM on the same host cluster. … With FT, the VM workload is moved to a separate host.

What are the types of DRS?

DRS has three levels of automation: Fully Automated – DRS applies both initial placement and load balancing recommendations automatically. Partially Automated – DRS applies recommendations only for initial placement. Manual – You must apply both initial placement and load balancing recommendations.

What is vSphere ft?

vSphere Fault Tolerance (FT) provides a live shadow instance of a virtual machine (VM) that mirrors the primary VM to prevent data loss and downtime during outages.

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Will Drs work if vCenter is down?

As DRS relies on vMotion/Storage vMotion and vCenter calculates a correct balance – DRS does not work when vCenter is down.