Hi: I want to replace a fault disk for software raid5. there is something like grub/biosgrub at the beginning of the disk, so if I can use command below to copy them: "dd if=/dev/sda of=/dev/sdb bs=1M count=10" if it is a gpt disk I can use sgdisk to copy the partition table then radmonize guid. however dd may also copy the mdadm superblock which include internal bitmap(since I don't caculate correct size). I don't know if there is risk that mdadm will be confused with the bitmap in new disk. although I have tried and it seems work fine. should I disable internal bitmap before add new disk? or mdadm will understand the superblock/bitmap at new disk is invalid and just overwrite everything?
