linux block device uuid and major-minor number

1. uuid

  1) vol_id
  # sudo vol_id /dev/sda1

  2) ls
  # ls -l /dev/disk/by-uuid/

  3) blkid
  # blkid /dev/sda1

  software raid
  #mdadm -d /dev/md0

  refer to: http://www.cyberciti.biz/faq/linux-finding-using-uuids-to-update-fstab/

2.major-minor number
  1)
  # cat /proc/partitions
  major minor  #blocks  name

     8     0  286513152 sda
     8     1     104391 sda1
     8     2  286390755 sda2
     8    16  488243200 sdb
     8    17  488239416 sdb1
     8    32  976588800 sdc
     8    33  976583286 sdc1
   253     0  284327936 dm-0
   253     1    2031616 dm-1

  2)
  # cat /sys/block/sda/sda1/dev
  8:1
  # cat /sys/block/sda/sda2/dev
  8:2