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.
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)- A81% (21)
- B4% (1)
- C12% (3)
- D4% (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.
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.
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.
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.
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
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