Exam 1V0-21.20 topic 1 question 10 discussion

Whre can obtaind the study material? Who can share the marerial please?

C. Network bandwidth on the host. vSphere DRS is a feature of VMware vSphere that automatically balances resource utilization across multiple hosts in a cluster. It evaluates various factors to determine the optimal placement of virtual machines. While factors such as storage bandwidth, network usage, and disk usage by the virtual machine may be considered, the network bandwidth on the host is a key parameter that vSphere DRS takes into account.

C - DRS works with hosts, not VMs, and does not consider Storage.

https://blogs.vmware.com/vsphere/2020/05/vsphere-7-a-closer-look-at-the-vm-drs-score.html ``` Network utilization cost – If a VM has a high networking bandwidth demand, and the host’s network usage is beyond a threshold, we charge a cost to the VM. The cost increases linearly with the increase in host network utilization. ```

When it comes to vSphere Distributed Resource Scheduler (DRS), it primarily focuses on CPU and memory usage (And network utilization) when making decisions about placing a virtual machine on a host. It evaluates the available resources on each host to ensure that the virtual machine is placed on a host with sufficient resources to meet its performance requirements. On the other hand, Storage DRS is responsible for making decisions based on disk usage and capacity. It helps balance the storage load by considering factors like datastore latency and space utilization. So, the distinction between the two services is essential. None of the provided options are directly related to what vSphere DRS primarily considers when placing a virtual machine on a host. DRS focuses on CPU and memory resources, while Storage DRS handles disk usage and capacity. The specific configuration of the VMware cluster will determine how these resources are allocated and managed. The best answer in this case then, is C. (Network Utilization)

It's disk usage, stop putting the wrong answers!!!!

I guess C answer is correct one. Host Network Saturation Threshold As mentioned earlier, DRS will avoid a network loaded host during load balancing decisions, only if its network utilization is beyond a certain threshold. This threshold is set to 80% by default. So, unless the host network utilization is above 80%, DRS considers the host to be a good candidate in terms of network resource availability. If a host’s network utilization is at or above the saturation threshold, DRS considers it to be network saturated. If all the hosts in the cluster are network saturated, DRS will prefer not to migrate VMs with network load, since migrating network loaded VMs to an already network saturated host would result in further degradation of VM performance. When DRS cannot migrate VMs due to this behavior, this can sometimes result in an imbalanced cluster

C In vSphere 6.5, DRS considers the utilization of host network adapters during initial placement and load balancing, but it does not balance the network load. Instead, its goal is to ensure that the target host has sufficient available network resources.

vSphere Distributed Resource Scheduler (DRS) considers multiple factors when making decisions about which host to place a virtual machine. The primary factors that DRS considers include: Resource utilization: DRS checks the CPU, memory, and network utilization of all hosts in a cluster to determine which host has the most resources available. Affinity rules: If a virtual machine has an affinity or anti-affinity rule defined, DRS will take this into consideration when deciding where to place the virtual machine. Host preferences: If a host has a preference for a particular virtual machine, DRS will take this into consideration when deciding where to place the virtual machine. Based on the options given, the answer closest to what DRS considers is "Resource utilization", which includes CPU, memory, and network utilization. So the answer is "A" is not correct, "B" is part of resource utilization, "C" is not considered by DRS and "D" is not considered either.

A virtual machine’s DRS score is based upon its CPU, memory, and network efficiencies. C is correct

C is the correct answer. D might not be answer because if VM reaches 19GB/20GB, still no use moving VM from one host to another.

VM must place on share datastore.