An administrator has configured Storage I/O Control (SIOC) on a Virtual Machine File System (VMFS) datastore.
• The datastore supports 30,000 IOPS
• Storage I/O Control has been set to manual
• Storage I/O Control is triggered when latency hits 30 ms
• The datastore contains 3 virtual machines (VMs)
1. A gold tier VM
2. A silver tier VM
3. A bronze tier VM
Assuming the datastore latency does not exceed 29ms, what is the maximum number of IOPS the bronze tier VM is entitled to?
In this scenario, Storage I/O Control (SIOC) manages and prioritizes storage I/O for virtual machines based on latency thresholds. The datastore supports 30,000 IOPS, and SIOC is configured to trigger when latency exceeds 30 ms. Since the latency condition does not meet the trigger threshold (it is at 29 ms), SIOC does not actively throttle or limit the IOPS for the VMs. As a result, the bronze tier VM, along with the other VMs, has the potential to utilize the full capacity of the datastore, which is 30,000 IOPS. Hence, the bronze tier VM can access up to 30,000 IOPS.
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.
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
I agree and go for A.
Agreed, as long as there is no resource competition it can get the 30,000 "Storage I/O shares are similar to shares used for memory and CPU resource allocation" https://docs.vmware.com/en/VMware-vSphere/7.0/com.vmware.vsphere.resmgmt.doc/GUID-D964A753-0844-4343-A96F-27A4C769F92D.html "Shares specify the relative importance of a virtual machine (or resource pool). If a virtual machine has twice as many shares of a resource as another virtual machine, it is entitled to consume twice as much of that resource when these two virtual machines are competing for resources." https://docs.vmware.com/en/VMware-vSphere/7.0/com.vmware.vsphere.resmgmt.doc/GUID-C0D2EFAE-1FE4-4867-AC3F-3E70D9A9ED59.html#GUID-C0D2EFAE-1FE4-4867-AC3F-3E70D9A9ED59
My understanting is A
'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
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
This answer does not make sense. Shares are nowhere mentioned and if it would be, the calculation is incorrect