从RAID1降级一个盘并重建成RAID4,双盘RAID4相当于RAID0,然后RAID4降级到RAID0,下面是流程记录.(后附总结) root@ns******:~# cat /proc/mdstat Personalities : [raid1] [linear] [multipath] [raid0] [raid6] [raid5] [raid4] [raid10] md2 : active raid1 sda2[1] sdb2[0] 1952855040 blocks super 1.2 [2/2] [UU…