我有以下 Raid 配置，
cat /proc/mdstat
Personalities : [raid1] [raid6] [raid5] [raid4]
md4 : active (auto-read-only) raid5 sda5[0] sdd5[4] sdc5[2] sdb5[1]
1536 blocks super 1.2 level 5, 512k chunk, algorithm 2 [4/3] [UUU_]
md3 : active raid5 sda4[0] sdd4[4] sdc4[2] sdb4[1]
11587487232 blocks super 1.2 level 5, 512k chunk, algorithm 2 [4/4] [UUUU]
md2 : active raid5 sda3[0] sdd3[4] sdc3[2] sdb3[1]
104756736 blocks super 1.2 level 5, 512k chunk, algorithm 2 [4/4] [UUUU]
md1 : active raid1 sda2[0] sdd2[3] sdc2[2] sdb2[1] …