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This feature is called Fault Tolerance. Fault Tolerance can be used for mission-critical VMs running critical applications. There is the overhead to achieve zero downtime for the highest level of business continuity because there are two running instances of a VM protected with Fault Tolerance. These VMs are continuously synchronized in real-time.
Users can work only with the primary original VM and the secondary ghost VM is invisible to them. The secondary VM becomes active and accessible in a moment. Users can notice a slight network latency during the moment of the transparent failover. There is no service interruption or data loss during failover. Fault Tolerance avoids split-brain scenarios when two active copies of a protected VM run simultaneously due to the file locking mechanism on shared storage for failover coordination.
If a primary VM fails, the secondary VM also fails. VMware vSphere features that are incompatible with FT:. VMware DRS allows you to run VMs in a balanced cluster and avoid overloading and situations when there are not enough hardware resources for virtual machines and applications running on VMs for normal operation there must be enough resources in the whole cluster in this case.
The VM is put in the intermediate state and the VM configuration cannot be changed during migration. The precopy process. Each VM memory page is copied from the source to the destination by using a vMotion network. The next pass of copying memory pages from the source to the destination is performed, because memory pages are being changed during the VM operation. This is an iterative process that is performed until no changed memory pages remain.
The changed memory pages are called dirty pages. It takes more time for VM migration with vMotion if memory-intensive operations are performed on a VM because more memory pages are changed. Insignificant network latency can be noticed inside the migrated VM for about a second at this moment. VMware DRS checks all of the resources in the resource pool of the cluster, including the resources consumed by VMs and the resources of each ESXi host within the cluster that can be provided to run VMs.
Resource checks are performed according to the configured policies. The demands of VMs are also taken into account the hardware resources that the VM needs to run at the moment of checking.
The formula is used for VM demand calculation for memory:. CPU demand is calculated based on the number of processor resources that are currently consumed by a VM. All the hosts are connected to shared storage, where VM files are located. The first host is very loaded, the second host has free CPU and memory resources, and the third host is heavily loaded.
In this case, the performance of these VMs can degrade. If the DRS is configured to work in the automatic mode, then running VMs are migrated with vMotion this action is illustrated with green arrows in the image below.
VM files including virtual disks VMDK , configuration files VMX , and other files are located in the same place on the shared storage during VM migration and after VM migration connections of VMs and their files are illustrated with dotted lines on the image.
There are free resources on each ESXi host within the cluster to run VMs effectively and ensure high performance. The situation can change due to uneven VM workloads, and the cluster can become imbalanced again. In this case, DRS will check the resources consumed and free resources in the cluster to initiate VM migration again. The recommendation can be implemented by using one of three automation levels:.
Fully automated. Partially automated. Recommendations for the initial placement of new VMs are the only ones applied automatically. Other recommendations can be initiated and applied manually or ignored. DRS provides recommendations for initial VM placement and VM migration but user interaction is required to apply these recommendations. You can also ignore the recommendations provided by DRS. DRS aggression levels or migration thresholds is the option to control the maximum imbalance level that is acceptable for a DRS cluster.
There are five threshold values from 1, the most conservative, to 5, the most aggressive. The aggressive setting initiates VM migration even if the benefit of VM placement is slight. Level 3, the middle aggression level, is selected by default and this is the recommended setting.
Affinity and anti-affinity rules are useful when you need to place specific VMs on specific ESXi hosts. Use cases can include:. This principle is used to avoid violation of the rule applied to VMs running on ESXi hosts if vCenter is temporarily unavailable or failed. Keep virtual machines together. This rule can be used when you want to localize network traffic between the selected VMs to avoid network overloading between ESXi hosts if VMs generate significant network traffic.
Another use case is running a complex application that uses components that depend on each other installed on multiple VMs or running a vApp. This could include, for example, a database server and an application server. Separate virtual machines. This option is used for high availability purposes. Virtual machines to hosts.
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