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2V0-622 · Question #74

Refer to the Exhibit. An administrator is configuring a storage device as shown in the Exhibit. What is the expected effect on the stated device after running the command?

The correct answer is B. I/O will rotate on all storage targets that are Active Optimized state only. When Round Robin PSP is applied to an ALUA-capable storage device, VMware's SATP_ALUA implementation restricts I/O rotation to only Active Optimized paths by default.

Section 3 – Configure and Administer vSphere 6.5 Storage

Question

Refer to the Exhibit. An administrator is configuring a storage device as shown in the Exhibit. What is the expected effect on the stated device after running the command?

Options

  • AI/O will rotate on all storage targets regardless of port group state.
  • BI/O will rotate on all storage targets that are Active Optimized state only.
  • CI/O will rotate on all storage targets that are Active Unoptimized state only.
  • DI/O will rotate on all storage targets that are on Available Nodes only.

How the community answered

(25 responses)
  • A
    8% (2)
  • B
    52% (13)
  • C
    12% (3)
  • D
    28% (7)

Why each option

When Round Robin PSP is applied to an ALUA-capable storage device, VMware's SATP_ALUA implementation restricts I/O rotation to only Active Optimized paths by default.

AI/O will rotate on all storage targets regardless of port group state.

Round Robin on an ALUA device does not ignore port group state; the SATP_ALUA plugin enforces path state preferences and restricts rotation to optimal paths.

BI/O will rotate on all storage targets that are Active Optimized state only.Correct

ALUA (Asymmetric Logical Unit Access) classifies paths into states such as Active Optimized and Active Unoptimized. When Round Robin PSP is configured on an ALUA array, it only rotates I/O among Active Optimized paths because these provide direct, lowest-latency access through the owning storage controller. Active Unoptimized paths remain available as failover but are excluded from the normal I/O rotation.

CI/O will rotate on all storage targets that are Active Unoptimized state only.

Active Unoptimized paths incur additional latency because I/O must traverse a non-owning controller; Round Robin does not include these paths in its rotation under normal conditions.

DI/O will rotate on all storage targets that are on Available Nodes only.

Available Nodes is not a recognized ALUA path state in VMware's storage stack; ALUA states are Active Optimized, Active Unoptimized, Standby, and Unavailable.

Concept tested: VMware Round Robin PSP behavior on ALUA storage arrays

Source: https://docs.vmware.com/en/VMware-vSphere/7.0/com.vmware.vsphere.storage.doc/GUID-FAFE1D8E-6E2B-44D6-9A9C-79397E3ED6CB.html

Topics

#round robin#ALUA#active optimized#I/O rotation

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