Troubleshooting Tip: ‘diagnose sys logdisk status’ shows unknown even though no disk issue is present

The following output shows that the file system status is displayed as unknown when 'diagnose sys logdisk status' is executed.

Example:

FGVMSLTM01 # diagnose sys logdisk status
State of log disk - /dev/sdb is: unknown

The command 'diagnose sys logdisk status' is used to retrieve the power mode of a specific disk.

FortiOS implements this function only for SATA/IDE disks. As a result, 'unknown' may be displayed on FortiOS systems that use disks other than SATA/IDE.

If unknown is displayed, this result can be ignored as long as it can be confirmed that the disk is mounted properly, the log collection function is operating normally, and no disk error messages are generated during the initial boot process.

To confirm if FortiOS sees the log disk properly, no matter what the type is, run 'get system status' instead and look at the 'Log hard disk' value:

FortiGate # get system status
...
Log hard disk: Available
...

In this example, an NVME drive was attached to the FortiGate, not a SATA/IDE one:

FortiGate # diagnose hardware deviceinfo disk

Disk SYSTEM(boot) 2.0GiB type: IDE [Virtual Disk] dev: /dev/nvme0n1
partition 247.0MiB, 138.0MiB free mounted: Y label: dev: /dev/nvme0n1p1(boot) start: 2048
partition 1.7GiB, 1.5GiB free mounted: Y label: dev: /dev/nvme0n1p2(boot) start: 526336

Disk Virtual-Disk ref: 64 30.0GiB type: IDE [Virtual Disk] dev: /dev/nvme1n1
partition ref: 65 29.5GiB, 29.3GiB free mounted: Y label: LOGUSEDX9B96404E dev: /dev/nvme1n1p1 start: 2048

Total available disks: 2
Max SSD disks: 8 Available storage disks: 1