Exam 2V0-21.23 topic 1 question 6 discussion

BC: You guarantee resources by setting a reservation on the pool. You cannot set a reservation on a pool that doesn't exist, so voting BC.

I thinc the correct is BD https://docs.vmware.com/en/VMware-vSphere/8.0/vsphere-resource-management/GUID-60077B40-66FF-4625-934A-641703ED7601.html

creating a sibling resoruce pool might not address guarantee the Produciton VMs memory allocation, both Test and production have not herarchycall distribution, a Parent resoruce pool for prod VMs might be my choise

D - You have to create a pool for Test as well - if you leave these VMs outside of a resource pool, they will be allowed full access to all host resources no restrictions. You have to create a pool for both, and then B assign a RESERVATION on the Production VM pool.

I agree BD. Questions asks guarantee so have to provide fix amount B, 2nd option is by default there is a parent pool any pool we create are Sibling , hence we need to create two sibling poos option D, definitely BD

Answer is DB. IMO. B - because we want a reservation D - because the default "invisible" resource pool is a parent. Meaning when you create a manual resource pool it is automatically a sibling. "Each standalone host and each DRS cluster has an (invisible) root resource pool that groups the resources of that host or cluster. The root resource pool does not appear because the resources of the host (or cluster) and the root resource pool are always the same. Users can create child resource pools of the root resource pool or of any user-created child resource pool. Each child resource pool owns some of the parent’s resources and can, in turn, have a hierarchy of child resource pools to represent successively smaller units of computational capability. " https://docs.vmware.com/en/VMware-vSphere/8.0/vsphere-resource-management/GUID-60077B40-66FF-4625-934A-641703ED7601.html

https://docs.vmware.com/en/VMware-vSphere/8.0/vsphere-resource-management/GUID-14102AB7-2CF9-42E3-9642-3EB6629EF530.html B - a memory reservation guarantees resources. C - a parent resource pool needs to be created for the production VMs as it does not exist. Shares do not guarantee resources, so wouldn't think that would be the correct answer, though it would still help setting shares too.

BC: the question says the pool doesn't exist. you first need to create the resource pool then reserve.

The question states that there are no resource pools. My guess would be CE.

Please, read the question carefully: There are no resource pools in the cluster. A combination of which two steps.... You must first create parent resource pool for production VMs in cluster - answer is C Then you must Assign a memory reservation value to the resource pool containing the Production VMs - answer is B Answer is BC

We only want to guarantee resources for the Production VMs, the subject does not care about allocation of resources for Test VMs : so a single resource pool is sufficient. As we will have a single resource pool, it is a Parent. --> Answer C The only to ALWAYS guarantee resources, is to set a reservation --> so Answer B.

I think the type of parent, sibling, child is simply based on hierarchy. "Resource pools and virtual machines that are at the same level are called siblings. " Said so in this Doc.

Ill go with A &D if you create a two RPs and set one with higher shares its the result that if contention occurs, the RP with more shares gets more power. A&D is more practical because its more dynamic but still gurantee the highest level of performance in the RP with more share if contention occurs.

Parent is the root folder, hence the pool will be taken as sibling

I think it's better to work with shares than reservation in this scenario. What about adding a new host? What about upgrading the host's hardware? Or even adding new VMs to the pool? A percentage-based approach seems better in my opinion, as it is dynamic. The reservation is going to be a static value for each resource in the pool. If the vSphere DRS Cluster is at its full capacity, then the Production Pool will have higher resource allocation in comparison to the Testing Pool. About C or D (Creating one Prod Pool or one Pool for each group of VMs): When you have DRS On, the cluster becomes a parent pool of all the pools below (invisible root resource pool), so if you have your Testing VMs outside of the Testing Pool, they will inherit the resource allocation from the Cluster, which is going to be hierarchically bigger than Production VMs Pool. That's why you should create 2 different pools in my opinion. So yeah, I think A & D should be right. https://docs.vmware.com/en/VMware-vSphere/8.0/vsphere-resource-management/GUID-60077B40-66FF-4625-934A-641703ED7601.html

BC To ensure that the Production VMs are always guaranteed the full allocation of memory in a vSphere cluster, you can perform the following steps: B. Assign a memory reservation value to the resource pool containing the Production VMs. By setting a memory reservation for the resource pool containing the Production VMs, you ensure that a specific amount of memory is reserved exclusively for these VMs, and it won't be used by other VMs in the cluster, even when the cluster is fully utilized. C. Create a parent resource pool for the Production VMs. Creating a parent resource pool for the Production VMs allows you to prioritize the allocation of resources to VMs within that pool. You can then set resource allocation policies for the parent resource pool to ensure that the Production VMs get the necessary resources.

https://docs.vmware.com/en/VMware-vSphere/8.0/vsphere-resource-management/GUID-60077B40-66FF-4625-934A-641703ED7601.html#:~:text=The%20resource%20pools%20at%20a,the%20root%20resource%20pools%20exist