Exam 2V0-21.23 topic 1 question 89 discussion

In this scenario, Storage I/O Control (SIOC) has been configured on a VMFS datastore with certain settings. SIOC helps manage and prioritize storage I/O for virtual machines based on latency thresholds. Let's break down the information given and calculate the maximum number of IOPS the bronze tier VM is entitled to: Datastore IOPS Capacity: 30,000 IOPS SIOC Latency Trigger: 30 ms Latency Condition: Latency does not exceed 29 ms (which means the SIOC trigger isn't reached) When the latency condition is not met (latency does not exceed 29 ms), SIOC does not actively throttle or limit IOPS for VMs. Therefore, in this case, all three VMs (gold, silver, and bronze) would be entitled to utilize the full capacity of the datastore, which is 30,000 IOPS. Since there is no active latency-based throttling happening when the latency is below 29 ms, the bronze tier VM is not limited to any specific number of IOPS in this scenario.

'A' looks the better answer. "When device latency exceeds a threshold, the datastore is considered to be congested and each virtual machine that accesses that datastore is allocated I/O resources in proportion to their shares" https://docs.vmware.com/fr/VMware-vSphere/7.0/com.vmware.vsphere.resmgmt.doc/GUID-7686FEC3-1FAC-4DA7-B698-B808C44E5E96.html

To be the correct answer as A. 30,000 other 2 VMs Gold and Silver shall be shut down or only Bronze shall be tested with this latency rate <29ms. So in normal cases, some IOPS shall be consumed by the Gold and Silver VMs and hence the Bronze VM shall not get 30,000 IOPS for sure. but the question has not been provided if the scenarios are all powered off-stage or live operation.

A for sure. I/O control does not trigger as treshold is not reached

My understanting is A

The answer is C, 10,000 IOPS. Storage I/O Control (SIOC) is a feature of VMware vSphere that helps to ensure that all virtual machines on a datastore have a fair share of IOPS. SIOC works by assigning each virtual machine a number of shares, and then allocating IOPS to the virtual machines based on their shares. In this scenario, the datastore supports 30,000 IOPS, and the administrator has set SIOC to manual. This means that SIOC will not be triggered unless the datastore latency exceeds 30 ms. The three virtual machines are assigned the following shares: Gold tier VM: 10 shares Silver tier VM: 5 shares Bronze tier VM: 2 shares The maximum number of IOPS that the bronze tier VM is entitled to is 10,000 IOPS. This is calculated by multiplying the number of shares by the total number of IOPS, and then dividing by the sum of the shares. (2 shares * 30,000 IOPS) / (10 shares + 5 shares + 2 shares) = 10,000 IOPS

I believe the correct answer is A. If the datastore latency does not exceed 29ms, Storage I/O Control (SIOC) will not be triggered. Therefore, the maximum number of IOPS the bronze tier VM is entitled to would be the full capacity of the datastore, which is 30,000 IOPS. So the answer is: A. 30,000