root@drew-8570w:~# ddrescue -S -b 8M /dev/sdd /mnt/hdd/drive_1_of_3.raw
GNU ddrescue 1.19
Press Ctrl-C to interrupt
rescued: 500107 MB, errsize: 0 B, current rate: 27862 kB/s
ipos: 500104 MB, errors: 0, average rate: 67092 kB/s
opos: 500104 MB, run time: 2.07 h, successful read: 0 s ago
Finished
root@drew-8570w:~# ddrescue -S -b 8M /dev/sdd /mnt/hdd/drive_2_of_3.raw
GNU ddrescue 1.19
Press Ctrl-C to interrupt
rescued: 500107 MB, errsize: 0 B, current rate: 43862 kB/s
ipos: 500104 MB, errors: 0, average rate: 68264 kB/s
opos: 500104 MB, run time: 2.03 h, successful read: 0 s ago
drew@drew-8570w:/mnt/hdd$ file *
drive_1_of_3.raw: Linux Software RAID version 1.2 (1) UUID=e9355597:7a4ff30b:21b71007:42443f63 name=127 level=5 disks=3
drive_2_of_3.raw: Linux Software RAID version 1.2 (1) UUID=e9355597:7a4ff30b:21b71007:42443f63 name=127 level=5 disks=3
root@drew-8570w:~# losetup -f /mnt/hdd/drive_1_of_3.raw
root@drew-8570w:~# losetup -f /mnt/hdd/drive_2_of_3.raw
root@drew-8570w:~# losetup -l
NAME SIZELIMIT OFFSET AUTOCLEAR RO BACK-FILE
/dev/loop0 0 0 0 0 /mnt/hdd/drive_1_of_3.raw
/dev/loop1 0 0 0 0 /mnt/hdd/drive_2_of_3.raw
root@drew-8570w:~# mdadm -Af /dev/md127 -Af /dev/loop0 /dev/loop1
mdadm: /dev/md127 has been started with 2 drives (out of 3).
root@drew-8570w:~# vgs
VG #PV #LV #SN Attr VSize VFree
vg_hdd 1 1 0 wz--n- 1.82t 0
vg_raid5 1 1 0 wz--n- 931.52g 558.91g
root@drew-8570w:~# lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
lv_hdd vg_hdd -wi-ao---- 1.82t
lv_raid5 vg_raid5 -wi-ao---- 372.61g
# mount /dev/vg_raid5/lv_raid5 /mnt/raid5