Hi FreCurring. I’m sorry but we don’t have any tools for Linux since it is an OS that WD doesn’t really support. Depending on your OS version you can use ‘fsck’ to test the file system on the drives and ‘smartctl’ to check the SMART status on the drives.
Another option would be to remove the drives from the system and using the Data Lifeguard Diagnostics software to test the drive on another machine. There is a DOS version of the software but it most likely won’t be able to read or properly identify the drives through a RAID controller. Just be careful removing drives from a RAID array since it may cause the RAID to degrade and have to rebuild.