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SG0-001 · Question #493

An administrator has cabled a server up to an FC SAN in a fully redundant manner. When cabling and logical assignment tasks are complete, however, the host only sees one path to its LUN. Which of the

The correct answer is A. A zone for the second path is missing. Despite redundant physical cabling for a server to an FC SAN, the host only seeing one path to its LUN indicates a logical configuration issue preventing the second path from being established.

Storage Connectivity

Question

An administrator has cabled a server up to an FC SAN in a fully redundant manner. When cabling and logical assignment tasks are complete, however, the host only sees one path to its LUN. Which of the following is the MOST likely cause for the issue?

Options

  • AA zone for the second path is missing
  • BThere are too many storage controllers in-band
  • CThe LUN is not being mirrored
  • DThe host does not have a dual-port HBA

How the community answered

(26 responses)
  • A
    81% (21)
  • B
    4% (1)
  • C
    12% (3)
  • D
    4% (1)

Why each option

Despite redundant physical cabling for a server to an FC SAN, the host only seeing one path to its LUN indicates a logical configuration issue preventing the second path from being established.

AA zone for the second path is missingCorrect

In Fibre Channel (FC) SANs, zoning defines which ports (initiators and targets) can communicate. If a second path is physically cabled for redundancy but its corresponding zone is missing, the host's HBA cannot logically connect to the storage port via that path, resulting in only one visible path to the LUN.

BThere are too many storage controllers in-band

The number of storage controllers in-band typically impacts overall performance or management, not directly causing a server to only see one path out of two cabled paths.

CThe LUN is not being mirrored

LUN mirroring is a data protection technique within the storage array and does not affect the number of paths a host discovers to a specific LUN.

DThe host does not have a dual-port HBA

The question states the server is cabled in a 'fully redundant manner,' implying the necessary hardware, such as dual-port HBAs or multiple HBAs, is already in place to support multiple paths.

Concept tested: Fibre Channel SAN zoning and multi-pathing

Source: https://www.cisco.com/c/en/us/td/docs/switches/datacenter/mds9000/sw/6_2/configuration/guide/fm_cnfg_guide_1/zoning.html

Topics

#FC SAN#zoning#redundancy#SAN troubleshooting

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