Lsblk

lsblk lists information on selected or all block devices in a system. The tree-view is helpful for complex plate-constructions with LVM or RAID. With lsblk, it can be controlled which suspension point, sector size or Scheduler has a device.

The following output of lsblk shows a set up RAID1 and a Installing Operating Systems on UEFI Systems. Both /dev/sda und /dev/sdb devices are unused:

:~$ lsblk 
NAME    MAJ:MIN RM   SIZE RO TYPE  MOUNTPOINT
sdb       8:16   0 223.6G  0 disk  
sda       8:0    0 186.3G  0 disk  
sdc       8:32   0  74.5G  0 disk  
├─sdc1    8:33   0 143.1M  0 part  /boot/efi
├─sdc2    8:34   0  18.5G  0 part  
│ └─md0   9:0    0  18.5G  0 raid1 /
├─sdc3    8:35   0  46.6G  0 part  
│ └─md1   9:1    0  46.6G  0 raid1 /home
└─sdc4    8:36   0   9.3G  0 part  
  └─md2   9:2    0   9.3G  0 raid1 [SWAP]
sdd       8:48   0  74.5G  0 disk  
├─sdd1    8:49   0 143.1M  0 part  
├─sdd2    8:50   0  18.5G  0 part  
│ └─md0   9:0    0  18.5G  0 raid1 /
├─sdd3    8:51   0  46.6G  0 part  
│ └─md1   9:1    0  46.6G  0 raid1 /home
└─sdd4    8:52   0   9.3G  0 part  
  └─md2   9:2    0   9.3G  0 raid1 [SWAP]

lsblk output of characteristics

The following information can be called up by the devices:

:~$ lsblk --help
[..]
Available columns:
       NAME  device name
      KNAME  internal kernel device name
    MAJ:MIN  major:minor device number
     FSTYPE  filesystem type
 MOUNTPOINT  where the device is mounted
      LABEL  filesystem LABEL
       UUID  filesystem UUID
         RO  read-only device
         RM  removable device
      MODEL  device identifier
       SIZE  size of the device
      STATE  state of the device
      OWNER  user name
      GROUP  group name
       MODE  device node permissions
  ALIGNMENT  alignment offset
     MIN-IO  minimum I/O size
     OPT-IO  optimal I/O size
    PHY-SEC  physical sector size
    LOG-SEC  logical sector size
       ROTA  rotational device
      SCHED  I/O scheduler name
    RQ-SIZE  request queue size
       TYPE  device type
   DISC-ALN  discard alignment offset
  DISC-GRAN  discard granularity
   DISC-MAX  discard max bytes
  DISC-ZERO  discard zeroes data

References

Translator: Alina Ranzinger Alina has been working at Thomas-Krenn.AG since 2024. After her training as multilingual business assistant, she got her job as assistant of the Product Management and is responsible for the translation of texts and for the organisation of the department.