On 05/03/20 14:53, Jinpu Wang wrote: > "mdadm /dev/md0 -a /dev/sdl1" should work for you to add the disk > back to array, maybe you can check first with "mdadm -E /dev/sdl1" to > make sure. Or better, --re-add or whatever the option is. If it can find the relevant data in the superblock, like bitmap or journal or whatever, it will just bring the disk up-to-date. If it can't, it functions just like add, so you've lost nothing but might gain a lot. Cheers, Wol
