Technical Tip: Explaining the error 'previous I/O error to superblock detected'

[sahmed_FTNT]

Description	This article describes, that in some cases, it can be possible to see the 'previous I/O error to superblock detected' error in the Console output.
Scope	FortiGate.
Solution	If observing the below error in the console or events: previous I/O error to superblock detected previous I/O error to superblock detected previous I/O error to superblock detected This error means that the system was unable to read/write to some cells on the disk. It might be caused by firmware (wrong/incomplete write cycle terminated by the power cycle or so) or by hardware failure in some parts/tracks/cells of the disk. It is suggested to reboot the device and observe if the errors will persist. Otherwise, it is possible to perform below steps: Take configuration backup of the device: Configuration backups and reset Format the bios in the device and re-write the same firmware again: Technical Tip: Formatting and loading FortiGate firmware image using TFTP Format the log disk as well ( Run a command: 'exec formatlogdisk'). Restore the configuration and observe the unit: Configuration backups and reset If still getting the same error like 'previous I/O error to superblock detected', move the ticket to the RMA Team, it device faulty.