I think I need some help with mdadm RAID1 reconstruction.
Our server had 4 hard drive, /dev/sda, /dev/sdb, /dev/sdc, /dev/sdd. sdc and sdd are data drives, and sda and sdb were in RAID1 configurations, created using mdadm, as the boot disk. Recently sda has failed, and the /proc/mdstat showed...