I cannot recall the precise steps of my original configuration.
I thought I had noted all my actions in a log or journal but I can't find it now.

CentOS 7 Server
UEFI bios
SATA Controller Mode set to: RAID1 in bios
I configured /dev/sdc and /dev/sdd in RAID1 using mdadm thus creating a 2TB RAID1 array.
I then created a 2TB lvm physical volume and then configured all allocatable space to one volume group with xfs filesystem.

pvdisplay --

--- Physical volume ---
PV Name /dev/md125
VG Name data
PV Size <1.82 TiB / not usable 3.06 MiB
Allocatable yes (but full)
PE Size 4.00 MiB
Total PE 476899
Free PE 0
Allocated PE 476899
PV UUID dsvFH3-9eL0-cOqt-jOGJ-cNrN-Nxwk-cWGGlI


vgdisplay --

--- Volume group ---
VG Name data
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 4
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 1
Open LV 1
Max PV 0
Cur PV 1
Act PV 1
VG Size <1.82 TiB
PE Size 4.00 MiB
Total PE 476899
Alloc PE / Size 476899 / <1.82 TiB
Free PE / Size 0 / 0
VG UUID 1lI07H-Wgbr-2NvR-qojp-aGX9-QeDl-nDt1ja


/etc/fstab shows - /dev/mapper/data /mnt/data xfs defaults 0 0

I want to save the current data on one of the drives and use the remaining drive for other data.
Is there a way to remove the RAID1 configuration without losing any data on the xfs filesystem?
Is it possible to keep the current Volume Group located and mounted at /dev/mapper/data /mnt/data but remove the underlying RAID1 configuration?

Thank you for your guidance.

Redacted - sorry, I wasn't thinking clearly.

Closing the thread.
I don't think it's possible.
The logical volume needs to be moved to another <<volume group / physical volume>> before I "fail" and "remove" the RAID1 array currently located at /dev/md125.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~

If I did not use lvm, I would have been able to disassemble the RAID1 and use the 1 drive --

mdadm /dev/md125 --fail /dev/sdd --remove /dev/sdd

Modify /etc/fstab to use the remaining drive:
/dev/sdc1 /mnt/data xfs defaults 0 0

Reboot and destroy the RAID array:
mdadm /dev/md125 --destroy

... you should be able to stop md125, then fail one of the devices to cause the RAID to be degraded. Then you can (mdadm) fail remove that device. Whether you can then convert to linear I have no idea, but nominally it should run degraded until you can arrange to get things sorted properly.
Don't know how that interacts with the BIOS RAID1, I never use it.

Edit: damn, I hate it when posts (edit) cross in flight like that.

Thanks, Syg --- gives me a boost to know I was tracking the same line of troubleshooting.
lvm got in the way on this issue.
if i had more hardware and disk storage, all the lvm flexibility would have been useful.