Physical Volume Actual Utilization for replacement

Question

I have a Volume Group which consist two physical volume of size 10TB each SSD & NLSAS (yes one very slow and other very fast) so total 20TB.

1. I created Volume backupvg with the 10TB SSD & formatted the lv with (ext4) (PV0)
2. While formatting Nlsas (ext4) (it consisted some previous data) I had too many problem with related infrastructure and do not want to do it again . Just imagine a company all infra is down for 24hrs during the format.
3. After formatting i added the Physical volume NL-SAS 10TB to the VOL GROUP backupvg (PV1)
4. Now when i tried to resize this LV i hit the limit of ext4 32bit that is 16TB max. So only resize2fs /dev/backupvg/backuplv01 16777216M worked
5. After some research about the solution and replicated the same on differnet infra and found that it will again create issue such as number 2 (SLOW NL-SAS & infra affection) So thought of not to convert to 64bit.

Now my only option is to add additional 6.xxTB SSD which is max i got and transfer the PE to it from the NLSAS and remove the NLSAS from the LV & VOLUME GROUP and convert the existing to XFS (after some time as i do not want to format number 2).

Now i want to know how will i know how much ACTUAL data is used by the NLSAS and how much by the SSD in the LV/VG which i think is giving issue due to 32bit.

• The 16tb is almost 98% full

pvdisplay -m

--- Physical volume ---
  PV Name               /dev/mapper/SSD1
  VG Name               backupvg
  PV Size               <10.00 TiB / not usable 2.00 MiB
  Allocatable           yes (but full)
  PE Size               4.00 MiB
  Total PE              2621439
  Free PE               0
  Allocated PE          2621439

  --- Physical Segments ---
  Physical extent 0 to 2621438:
    Logical volume      /dev/backupvg/backuplv01
    Logical extents     0 to 2621438

  --- Physical volume ---
  PV Name               /dev/mapper/NLSAS1
  VG Name               backupvg
  PV Size               <10.00 TiB / not usable 2.00 MiB
  Allocatable           yes (but full)
  PE Size               4.00 MiB
  Total PE              2621439
  Free PE               0
  Allocated PE          2621439

  --- Physical Segments ---
  Physical extent 0 to 2621438:
    Logical volume      /dev/backupvg/backuplv01
    Logical extents     2621439 to 5242877

vgdisplay backupvg

  --- Volume group ---
  VG Name               backupvg
  System ID
  Format                lvm2
  Metadata Areas        2
  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                2
  Act PV                2
  VG Size               <20.00 TiB
  PE Size               4.00 MiB
  Total PE              5242878
  Alloc PE / Size       5242878 / <20.00 TiB
  Free  PE / Size       0 / 0

lvdisplay /dev/backupvg/backuplv01

  --- Logical volume ---
  LV Path                /dev/backupvg/backuplv01
  LV Name                backuplv01
  VG Name                backupvg
  LV Write Access        read/write
  LV Status              available
  # open                 1
  LV Size                <20.00 TiB
  Current LE             5242878
  Segments               2
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:57

Kindly suggest how to break the limit of 16TB but not format/convert NLSAS to 64bit. And how to check which PV is used 6TB and which is used full 10TB. If PV NLSAS is used 6TB and 4tb is not used than i can attach 6tb ssd lun than how to proceed with the movement from PV NLSAS 6tb data to SSD 6TB DATA

update As requested

pvdisplay

 --- Physical volume ---
  PV Name               /dev/mapper/LUN_10TB_SSD1
  VG Name               backupvg
  PV Size               <10.00 TiB / not usable 2.00 MiB
  Allocatable           yes (but full)
  PE Size               4.00 MiB
  Total PE              2621439
  Free PE               0
  Allocated PE          2621439
  PV UUID               OjUFfu-*removed*

  --- Physical volume ---
  PV Name               /dev/mapper/LUN_10TB_NLSAS1
  VG Name               backupvg
  PV Size               <10.00 TiB / not usable 2.00 MiB
  Allocatable           yes (but full)
  PE Size               4.00 MiB
  Total PE              2621439
  Free PE               0
  Allocated PE          2621439
  PV UUID               57YeFo-*removed*

vgdisplay

  --- Volume group ---
  VG Name               backupvg
  System ID
  Format                lvm2
  Metadata Areas        2
  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                2
  Act PV                2
  VG Size               <20.00 TiB
  PE Size               4.00 MiB
  Total PE              5242878
  Alloc PE / Size       5242878 / <20.00 TiB
  Free  PE / Size       0 / 0
  VG UUID               0m9T8d-bSa7-*removed*

lvdisplay

--- Logical volume ---
  LV Path                /dev/backupvg/backuplv01
  LV Name                backuplv01
  VG Name                backupvg
  LV UUID                DT0rXQ-*removed*
  LV Write Access        read/write
  LV Creation host, time hostnameremoved, 2020-02-01 22:02:51 +0400
  LV Status              available
  # open                 1
  LV Size                <20.00 TiB
  Current LE             5242878
  Segments               2
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:57