CompTIA
CAS-002 · Question #798
CAS-002 Question #798: Real Exam Question with Answer & Explanation
The correct answer is B: The web server was not multipathed.. A Fibre Channel switch port failure causes storage downtime when the server lacks multipath I/O, leaving a single point of failure in the path between the host and the SAN.
Question
A port in a fibre channel switch failed, causing a costly downtime on the company's primary website. Which of the following is the MOST likely cause of the downtime?
Options
- AThe web server iSCSI initiator was down.
- BThe web server was not multipathed.
- CThe SAN snapshots were not up-to-date.
- DThe SAN replication to the backup site failed.
Explanation
A Fibre Channel switch port failure causes storage downtime when the server lacks multipath I/O, leaving a single point of failure in the path between the host and the SAN.
Common mistakes.
- A. iSCSI uses a different storage protocol stack over TCP/IP rather than Fibre Channel, which relies on HBAs and an FC fabric; an iSCSI initiator failure is irrelevant in an FC-based SAN environment.
- C. SAN snapshots are point-in-time data copies used for backup and recovery operations, not mechanisms for maintaining live storage connectivity during a switch port failure.
- D. SAN replication to a backup site is a disaster recovery mechanism for off-site data protection and does not prevent or mitigate downtime caused by a local Fibre Channel switch port failure.
Concept tested. Multipath I/O redundancy for Fibre Channel SAN availability
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