2V0-621 · Question #73
Refer to the Exhibit. An administrator wishes to provide Load Balanced I/O for the device shown in the Exhibit. To meet this requirement, which setting should be changed?
The correct answer is B. Path Selection Policy = Round Robin (VMware). To achieve load-balanced I/O across multiple storage paths in VMware, the Path Selection Policy must be set to Round Robin, which distributes I/O requests evenly across all active paths.
Question
Refer to the Exhibit. An administrator wishes to provide Load Balanced I/O for the device shown in the Exhibit. To meet this requirement, which setting should be changed?
Exhibit
Options
- AStorage Array Type Policy = VMW_NMP_RR
- BPath Selection Policy = Round Robin (VMware)
- CStorage Array Type Policy = VMW_SATP_RR
- DPath Selection Policy = MRU (VMware)
How the community answered
(56 responses)- A2% (1)
- B89% (50)
- C5% (3)
- D4% (2)
Why each option
To achieve load-balanced I/O across multiple storage paths in VMware, the Path Selection Policy must be set to Round Robin, which distributes I/O requests evenly across all active paths.
VMW_NMP_RR is not a valid SATP value; it conflates NMP (Native Multipathing Plugin) and RR (Round Robin) naming conventions from different layers of the storage stack.
The Path Selection Policy (PSP) controls how I/O is distributed across available paths to a device. Setting it to Round Robin causes the VMware NMP to cycle I/O requests across all active paths in turn, achieving load balancing. The SATP is a separate component responsible for path discovery and health monitoring, not I/O distribution.
VMW_SATP_RR is not a valid SATP identifier; SATPs (Storage Array Type Plugins) classify and manage path health for specific array types, they do not control how I/O is distributed across paths.
MRU (Most Recently Used) PSP sends all I/O through a single path - the most recently active one - and only fails over to another path if that path fails, providing no load balancing.
Concept tested: VMware NMP Path Selection Policy for load balancing
Source: https://docs.vmware.com/en/VMware-vSphere/6.0/com.vmware.vsphere.storage.doc/GUID-DB5BC795-759A-40E0-B75E-69BAF6DEFADC.html
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