Linux command – lsblk

lsblk – list block devices

測試環境為 CentOS 7 x86_64

lsblk 可以列出所有關於區塊設備 (Block devices) 的資訊. lsblk 主要是去讀取 sysfs 的資訊,關於 sysfs 請參考 https://benjr.tw/20857

[root@localhost ~]# lsblk 
NAME        MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
sda           8:0    0   464G  0 disk 
├─sda1        8:1    0     1G  0 part /boot
└─sda2        8:2    0   463G  0 part 
  ├─cl-root 253:0    0    50G  0 lvm  /
  ├─cl-swap 253:1    0   7.9G  0 lvm  [SWAP]
  └─cl-home 253:2    0 405.1G  0 lvm  /home
sr0          11:0    1  1024M  0 rom 

lsblk 會列出所有 區塊設備 (Block devices) 的資訊,可以使用 -d 參數,顯示主要 區塊設備 (Block devices) 的資訊.

-d, –nodeps

Don’t print slaves or holders.

[root@localhost ~]# lsblk -d
NAME MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
sda    8:0    0  464G  0 disk 
sr0   11:0    1 1024M  0 rom  

[root@localhost ~]# lsblk -d /dev/sda
NAME MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
sda    8:0    0  464G  0 disk 

其他可以用的參數

• -b, –bytes – print SIZE in bytes rather than in human readable format
• -f, –fs – output info about filesystems
• -i, –ascii – use ascii characters only
• -m, –perms – output info about permissions
• -l, –list – use list format output
• -t, –topology – output info about topology
• -S, –scsi – output info about SCSI devices
• -o, –output – output columns

-o, –output

Output columns

[root@localhost ~]# lsblk -d -o name,serial,KNAME,MODEL,STATE,type,vendor
NAME SERIAL           KNAME MODEL            STATE   TYPE VENDOR
sda  220a00015519f2d6 sda   ST EX8650        running disk Promise 
sr0  006080270406     sr0   DVD A  DS8A4S    running rom  Slimtype

–output 可以用的參數

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

PARTLABEL – partition LABEL

PARTUUID – partition UUID

RA – read-ahead of the device

RO – read-only device

RM – removable device

MODEL – device identifier

SERIAL – disk serial number

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

WSAME – write same max bytes

WWN – unique storage identifier

RAND – adds randomness

PKNAME – internal parent kernel device name

HCTL – Host:Channel:Target:Lun for SCSI

REV – device revision

VENDOR – device vendor