Few days ago I got one of my Linux RAID1 arrays go bad. One of the disks got bad sectors and the other one lost it’s superblock. So the array was degradated and the only one “good” disk was with bad sectors. I added a new disk and tried to sync the data but it stucked on 36%. Using tools like “dd” or “ddrescue” didn’t help neither. The “dd” just kept stopping and the “ddrescue” was recovering with 364Bytes/second so …
How to recover mdadm RAID array after superblock is zeroed
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