mdadm –grow /dev/md/mirror –level=5
mdadm –grow /dev/md/mirror –add /dev/sdc –raid-devices=3
然后等重建完成之后
mdadm –grow /dev/md127 –size=max
mdadm –grow /dev/md/mirror –level=5
mdadm –grow /dev/md/mirror –add /dev/sdc –raid-devices=3
然后等重建完成之后
mdadm –grow /dev/md127 –size=max