CV0-003 · Question #147
Anne, a system administrator, has replaced an HBA in one of her servers; however, none of the FC logical drives are accessible. Which of the following is MOST likely to be the case?
The correct answer is A. The WWN of the new HBA is not defined in the FC switch. Fibre Channel switches use WWN-based zoning to control device access, so a replacement HBA with a new WWN must be added to the switch zone configuration before any FC storage resources become accessible.
Question
Anne, a system administrator, has replaced an HBA in one of her servers; however, none of the FC logical drives are accessible. Which of the following is MOST likely to be the case?
Options
- AThe WWN of the new HBA is not defined in the FC switch.
- BThe MAC address of the new HBA is not defined in the FC switch.
- CThe LUN mask of the new HBA is not defined in the FC switch.
- DThe IP of the new HBA is not defined in the FC switch.
How the community answered
(52 responses)- A79% (41)
- B4% (2)
- C12% (6)
- D6% (3)
Why each option
Fibre Channel switches use WWN-based zoning to control device access, so a replacement HBA with a new WWN must be added to the switch zone configuration before any FC storage resources become accessible.
Every FC HBA has a unique World Wide Name (WWN) that the FC switch uses for zoning - the access control mechanism defining which initiators can communicate with which storage targets. When the HBA is replaced, the new device presents a different WWN that is absent from the existing zone configuration, causing the switch to block all traffic from that initiator and making all FC logical drives inaccessible until the new WWN is added to the appropriate zone.
MAC addresses are Ethernet layer-2 identifiers and are not used in Fibre Channel networks; FC uses WWNs for device identification and zoning.
LUN masking is enforced at the storage array or HBA driver level to restrict which LUNs a host can see, not configured on the FC switch itself.
Fibre Channel is not an IP-based protocol; FC switches identify and zone devices by WWN, not by IP address.
Concept tested: Fibre Channel WWN zoning and HBA replacement
Source: https://docs.broadcom.com/doc/12352478
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