Disk Utility shows me three hard drives with the same name. How do I find the physical hard drives they refer to? I have to change out the hard drives in Raid 1 array. But all the hard drives have the same name in DiskUtility app because they are all the same type of drives from the same manufacturer.

So how can I find out which drive is failing?

I mean, how can I tell which physical drive is referred to by each DiskUtility drive name?

@Allen, thank you for your interest.
I have a Mac Pro running Mojave that has 4 drive slots. The first slot holds a 1TB Intel Server SSD with the MacOS installed. There are also three 2TB WD 3.5" SATA Drives that were originally configured in a 6TB Raid 5 array. 
Disk Util list reveals that the three SATA drives are all the same WD Model number. 
One of the SATA Drives in the raid array failed and I took it out of the raid array and mirrored the remaining two drives as a raid 1 array.
Recently, one of the two mirrored drives also 'failed' from the perspective of the raid array. 
What I need to do is disconnect both of the 'failed' drives from the raid and copy the data on the remaining SATA drive to an external drive to preserve it and replace the data on a single new SATA Drive, then add two more SATA Drives and re-create a new Raid 5 Array.

So again, my question is: how do I distinguish which physical SATA drive is referred to by the remaining WD drives listed in disk util list is the remaining 'good' drive in the disk util listing that contains my valuable data.

Therefore I believe the question I asked is a proper explanation of the information I am seeking:

how can I tell which physical drive is referred to by each Disk Utility list drive name?

That is, I think the question does not require any information about the drives or their configuration, or their history, or the problems I am having.

Either there is a way for MacOS to tell me which physical drive bay contains which logical drive listed in disk util list, or MacOS has no way of revealing the correspondence between the Logical List of drives in Disk Util and the physical drives attached to the system.

If Mojave cannot tell me which logical drive is which physical drive, then I need to know if there is another utility which will reveal the correspondence.

Does that make sense?
Thanks,
Kimball
The method I use is to grab the serial number from the drive. This information is usually printed by the factory on a label on the physical disk so that it is easy to identify.

Start by ensuring you have HomeBrew installed. Then run the following command to install smartmontools:

brew install smartmontools


Then grab the serial number from the failing drive:

smartctl -a /dev/disk2


This assumes that the failing disk is /dev/disk2 - obviously change that to reflect the disk you have ben reported as failing.

In the output you'll find something like:

Serial Number: C8AF902EAB39


(format varies depending on manufacturer)

You should be able to match that up with the label on the drive.