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SG0-001 · Question #34

A host-based logical volume manager is used to migrate data from an old array to a newer one. The storage administrator has completed the physical connections, zoning, and masking, but the storage vol

The correct answer is D. Bus rescan. After physical connections, zoning, and masking are complete for new storage volumes, the host needs to perform a bus rescan to detect and make these volumes visible to the operating system and logical volume manager.

Storage Implementation

Question

A host-based logical volume manager is used to migrate data from an old array to a newer one. The storage administrator has completed the physical connections, zoning, and masking, but the storage volumes from the new array are still not visible on the host. Which of die following steps should be performed NEXT?

Options

  • AChange the HBA driver topology configuration
  • BReplace failed HBA
  • CRun fcping
  • DBus rescan

How the community answered

(18 responses)
  • B
    11% (2)
  • C
    6% (1)
  • D
    83% (15)

Why each option

After physical connections, zoning, and masking are complete for new storage volumes, the host needs to perform a bus rescan to detect and make these volumes visible to the operating system and logical volume manager.

AChange the HBA driver topology configuration

Changing the HBA driver topology configuration is typically for initial setup or specific performance tuning, not the immediate next step for discovering newly masked volumes.

BReplace failed HBA

There is no indication of a failed HBA; physical connections, zoning, and masking were completed, implying the HBA is functional.

CRun fcping

Running fcping tests Fibre Channel connectivity, but the problem states physical connections, zoning, and masking are complete, implying basic FC connectivity is established; the issue is volume visibility at the host level.

DBus rescanCorrect

A bus rescan forces the host's operating system to re-enumerate its storage controllers and attached devices. This action allows the host to detect and recognize the newly presented storage volumes from the new array, making them visible to the host's logical volume manager.

Concept tested: Host storage discovery after LUN presentation

Source: https://docs.kernel.org/admin-guide/scsi-rescan.html

Topics

#LVM#SAN host configuration#bus rescan#storage visibility

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