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SK0-004 · Question #751

While updates are being performed on a storage array, one of the virtual hosts loses connectivity to the storage. The server administrator confirms the virtual host has two HBAs, which each have…

The correct answer is D. Multipathing misconfiguration. With two HBAs showing active green LEDs, the physical layer is intact, pointing to a software-level path management failure rather than a hardware issue.

Troubleshooting

Question

While updates are being performed on a storage array, one of the virtual hosts loses connectivity to the storage. The server administrator confirms the virtual host has two HBAs, which each have green LEDs showing on the ports. Which of the following is the MOST likely cause of the issue?

Options

  • AImproper RAID configuration
  • BLoose fiber connection
  • CIncorrect volume partitioning
  • DMultipathing misconfiguration

How the community answered

(23 responses)
  • A
    26% (6)
  • B
    4% (1)
  • C
    17% (4)
  • D
    52% (12)

Why each option

With two HBAs showing active green LEDs, the physical layer is intact, pointing to a software-level path management failure rather than a hardware issue.

AImproper RAID configuration

RAID configuration governs data redundancy within the array itself and does not affect host-to-storage network connectivity.

BLoose fiber connection

A loose fiber connection would result in a link-down state, shown by an amber or off LED, not a green active LED.

CIncorrect volume partitioning

Volume partitioning defines how storage space is divided on a disk and has no bearing on whether the host can establish a connection to the storage array.

DMultipathing misconfigurationCorrect

Multipathing software (e.g., MPIO) is responsible for managing redundant HBA paths to storage. If multipathing is misconfigured, the host cannot properly failover or load-balance across both HBAs when one path becomes temporarily unavailable during storage array maintenance, resulting in a complete loss of connectivity despite both HBAs being physically active.

Concept tested: SAN multipathing failover and HBA redundancy

Source: https://learn.microsoft.com/en-us/windows-server/storage/file-server/troubleshoot/multipath-io-overview

Topics

#multipathing#HBA#SAN connectivity#storage array

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