major minor #blocks name 8 16 3907018584 sdb 8 17 1024 sdb1 8 18 499712 sdb2 8 19 4096000 sdb3 8 20 20480000 sdb4 8 21 3881939968 sdb5 8 0 3907018584 sda 8 1 1024 sda1 8 2 499712 sda2 8 3 4096000 sda3 8 4 20480000 sda4 8 5 3881939968 sda5 9 5 3881807872 md5 9 4 20462592 md4 9 2 498688 md2 9 3 4092928 md3 253 0 3493621760 dm-0