Thunderbay rebuiling no progress bar using iMac 2017 Mojave

Confirming that I am using softraidXT 5.8.4, and it's also the same for the driver running on my mac.

Are you getting any MacOS alerts at startup that your volume is damaged and is being mounted read only?

I called in SoftRAID support and verified that I am getting an error saying that the OS is mounting the drive as read only.  I had to buy DiskWarrior ($129 USD) based on the tech's recommendation to do a partial rebuild and was able to recover most of my files.  I am only missing a handful which was okay because I had a back up (a back up of the back up).  The rebuild using DiskWarrior allowed SoftRAID XT to finish the rebuild with no additional problems.  I'm a bit dissapointed that I needed to buy an additional software to do the job of SoftRAID specially since it markets itself as a secure method of backing up one's files.  This is the second time in the two years that I've had this unit that's failed this way.  Ive owned Drobos, LaCie an a Pegasus RAID units in the past and they never failed me the way this unit has.  I really wished I would have spent the extra money and gone with LaCie or Drobo.  Now I feel that I cannot trust this unit to keep my files (which are my livelihood) safe.

This volume corruption is a common issue with HFS volumes, unfortunately. It happens to all volumes, not just SoftRAID volumes. that is why Disk Warrior is still selling.

My theory is OS X (during a upgrade or driver install especially), shuts down faster than the disks save their final data from the disk cache. Thunderbolt instantly powers off the disks. This slowly degrades the directory, which ultimately needs to be rebuilt. Users also may notice volumes get slower over time, beachballing opening folders, etc, for a few seconds. This is a sign of a damaged directory also.

Use Disk Warrior to check other volumes you have. I suspect you will find some are OK, some are in various states of degradation.

Sorry for your bad experience there.