Technical Tip: Disk indicate as Spare in RAID status

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Description

This article describes why RAID information shows the disk as 'Spare' and how to fix the issue. This happens sometimes when new RMA replacement disks are replaced.

Scope

FortiAnalyzer 

FAZ # diagnose system raid status

Mega RAID:
RAID Level: Raid-50s 
RAID Status: Degraded
RAID Size: 201170GB
File System: ext4 200144GB
Groups: 6

Disk 0: OK 3726GB Group-1
Disk 1: OK 3726GB Group-1
Disk 2: OK 3726GB Group-1
Disk 3: OK 3726GB Group-1
Disk 4: OK 3726GB Group-1
Disk 5: Spare 29802GB
Disk 6: OK 3726GB Group-1
Disk 7: OK 3726GB Group-1

RAID status will show as Degraded, which means one of the disks has failed and is no longer being used by the controller.

Somehow the RAID level will show as 50s.

Solution

Confirmed CLI information on the below command:

FAZ # diagnose system disk info

Disk 4:
Vendor: SEAGATE
Product: ST4000NM0095
Revision: K004
Compliance: SPC-4
User Capacity: 4,000,787,030,016 bytes [4.00 TB]
Logical block size: 4096 bytes
LU is fully provisioned
Rotation Rate: 7200 rpm
Form Factor: 3.5 inches
Logical Unit id: 0x5000c500a7be3ccf
Serial number: XXXXXXXXXXXXXXXXXXXX
Device type: disk
Transport protocol: SAS (SPL-3)
Local Time is: Sun Jan 28 09:34:35 2024 ICT
SMART support is: Available - device has SMART capability.
SMART support is: Enabled
Temperature Warning: Enabled

Disk 5:
Vendor: SEAGATE
Product: ST4000NM025B
Revision: E001
Compliance: SPC-5
User Capacity: 4,000,787,030,016 bytes [4.00 TB]
Logical block size: 512 bytes
Physical block size: 4096 bytes
LU is fully provisioned
Rotation Rate: 7200 rpm
Form Factor: 3.5 inches
Logical Unit id: 0x5000c500eeda57cb
Serial number: XXXXXXXXXXXXXXXXXXXX
Device type: disk
Transport protocol: SAS (SPL-3)
Local Time is: Sun Jan 28 09:34:35 2024 ICT
SMART support is: Available - device has SMART capability.
SMART support is: Enabled
Temperature Warning: Enabled

Notice :

Disk 5 has a different Logical block size from the existing disk, which is why the RAID is not able to read properly. 

Proceed to get the same disk model as the existing one for the replacement from the RMA team. 

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