Also, a "verify disk" is not a strenuous test. If it passes,  you may want to "certify disk" to really see if it is OK.

Just chatted with OWC support and they said the enclosures won't blink individual lights with a software RAID setup. Seems odd, but I'll just have to unmount and pull disks to figure out which is which.

Please attach a SoftRAID tech support file. (Utilities menu), not the log.

I do not know why the drive lights are not blinking. I am not a hardware specialist however.

 Attached the log. And is there any reason you can think of that my enclosures are only blinking Activity light rather than individual disk lights? I have four of them and they all act the same. All are in JBOD mode. It's odd behavior.

I just pulled one off the shelf and the 2 middle LED's flash with lights with Blink Disk light.

Attach a support file, let me see what is going on. the panic was a file system (probably a hang reading the volume) problem.

It has four lights on the front: Power, 1, 2, and Activity. Activity is the only one that lights up during Blink Disk Light.

I'm having more problems now, which may or may not be related. I got a "Many SoftRAID Disk Errors" message today which said one of my disks encountered 2 or more read/write errors in the past 24 hours. I'm trying to figure out which one. I can see it in SoftRAID and it says "no errors" and has passed the SMART status test. It is currently rebuilding. 

One extra issue; as soon as that happened, I attempted to unmount my other drive through SoftRAID so I could power them off and troubleshoot. As soon as I tried, my computer froze and had a kernel panic. I'm attaching the log of that here. 

Any ideas what's going on?

https://eshop.macsales.com/item/OWC/MEMDC2KIT/

Most of the enclosures have lights. Which one do you have?

Let me look at a unit and get back to you.

But I also use four Mercury Elite Pro Duals (newer and older TB2 models); none of those are blinking individual disk lights--rather they're all blinking just an "Activity" light which doesn't indicate which disk is in use. I can figure it out by taking each one apart one at a time and removing a single disk, but that isn't ideal with eight different disks.

I was assuming a Thunderbay. If you look behind (through) the screen, neither of the sides has an activity light?