The best approach for a hard disk failure on a FortiAnalyzer with hardware RAID is to perform a hot swap. FortiAnalyzer models that support hardware RAID are designed for high availability, which includes the ability to replace a failed component, such as a hard disk, without powering down the unit. This process is known as hot-swapping. Once the failed disk is replaced with a new one, the RAID controller automatically initiates the rebuild process to restore the array's redundancy and health, minimizing system downtime and data unavailability.

A: A physically failed hard disk cannot self-recover. The purpose of RAID is to provide redundancy so the system can continue operating until the failed disk is replaced.

B: The execute format disk command is a destructive operation that erases all data on the disks. It is not used for recovering from a single disk failure in a RAID array.

D: Shutting down the FortiAnalyzer to replace the disk (a cold swap) is less efficient than a hot swap. It introduces unnecessary downtime, which hot-swapping is specifically designed to avoid.

1. FortiAnalyzer 7.4.1 Administration Guide

Page 231

Section: "RAID Management".

The guide states

"If a disk fails

the RAID becomes degraded. You must replace the failed disk to return the RAID to a healthy state. On devices that support hot swapping

you can replace the disk without shutting down the device." This directly supports the hot-swap procedure (Option C) as a standard and supported method.

2. FortiAnalyzer 7.4.1 Administration Guide

Page 231

Section: "RAID Management".

The document further explains

"After replacing the disk

the system automatically rebuilds the RAID." This confirms that manual formatting (Option B) is not required and contradicts the idea of self-recovery (Option A).

3. FortiAnalyzer 3700F QuickStart Guide

Page 6

Section: "Hot-Swappable Components".

This hardware-specific guide lists "Hard Drives" as hot-swappable components

explicitly confirming that the hardware is designed for replacement while the system is operational

making hot-swapping (Option C) the intended and best procedure over a shutdown (Option D).