Technical Tip: New RMA Replacement disk does not rebuild after install

heng · ‎10-21-2021

Description

This article discusses when the FortiManager/FortiAnalyzer hardware is being installed with a new RMA replacement disk and the disk does not rebuild by itself and how to fix it.

When the disk does not rebuild by itself, it will show a RAID status 'Degraded' as well as the disk number as 'Unused' even it able to detect the new disk size correctly. Degraded also means the hard drive is no longer being used by the RAID controller.

An example of the CLI output from FortiAnalyzer as follows with the RAID status query.

Scope

FortiAnalyzer.

FAZ # diagnose sys raid status

Software RAID:

RAID Level: Raid-10

RAID Status: Degraded

RAID Size: 5589GB

File System: ext4 5501GB

Disk 0: Unused 2795GB

Disk 1: OK 2795GB

Disk 2: OK 2795GB

Disk 3: OK 2795GB

Solution

Sometimes, the newly installed disk is not properly detected by the system.

To fix it:

Reboot the system.
Reseat (slot-out/slot-in) the physical disk again to trigger the detection and the rebuild.
Run CLI execute raid add-disk <disk no.> to add the disk manually.

For example, disk 0 is the disk number that is being replaced.

FAZ # execute raid add-disk 0

Added disk 0 to RAID.

Or manually delete and add it again:

execute raid delete-disk 6
execute raid add-disk 6

Run diagnose sys raid status to check whether the rebuilding is started.

For example, disk 0 will start the rebuilding, run the same command over time to check the status and disk 0 will be visible as 'OK' if the rebuild is completed.