Almost sounds like a raid controller / expander in the system?
I agree that's what it sounds like, but there simply isn't a separate RAID controller installed. Is it possible that the onboard RAID system is making the beeps?
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Do you have a part number on the drive bay?
or maybe a photo?
I was just now taking some stills and video to share with the forum, and in so doing I inadvertently confirmed that the beeping does originate from the drive cage (put my finger over the "blowhole" component from which the beeps were emanating). That confirms this issue to be off topic for this board, so I've marked the question answered.
The workstation was built to order from parts by a firm we've used in the past. I'll drop them a note and see what they have to say.
But for the curious: the drive cage / SATA backplane was bundled with the chassis, a Chenbro SR105 series.
Attached is an image of the backplane (in normal operation a cooling fan is mounted over this panel). "Blowhole" is the round black thing in the center along the top
Was able to find specs on the backplane fairly easily, discovered that there are in fact TWO cooling fan connectors at the bottom there, and I had the single available fan plugged into the "fan 2" slot, which was causing the alarm condition of a supposed failure in fan 1. All I had to do was move the cooling fan connector to the "fan 1" pins, and the beeping stopped.
Thanks for the dialogue, Doc_Silvercreek... it really helped me arrive at the answer.