playing with dd_rescue, loop device and mdadm
How to backup drive and examine mdadm over the image file using loop
Step 1:
Making backup with
dd_rescue /dev/#damaged_hdd /mountpoint/file
Step 2:
Print partitions with
losetup /dev/loop0 /mountpoint/file
fdisk -l -u /dev/loop0
first_storage_pv2_2_2.img2 160650 1945471499 972655425 fd Linux raid autodetect
Make a loopback dev with proper partition
losetup -o(start num*512) --sizelimit (end-start num*512) /loop[1-9] /mountpoint/file
Step 3:
mdadm --examine /dev/loop0
Additional commands
delete loop dev
losetup -d /loop[0-9]
assemble md array
mdadm --assemble --force /dev/md[0-9] /dev/device[s]
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