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technology/applications/cli/system
lsblk.md

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---
obj: application
repo: git://git.kernel.org/pub/scm/utils/util-linux/util-linux.git
---
# lsblk
List block devices
Usage: `lsblk [options] [device...]`
## Options
| Option | Description |
| ------------------- | ------------------------------------------------------------------------------------------------------------------------ |
| `-A, --noempty` | Don’t print empty devices |
| `-a, --all` | Disable all built-in filters and list all empty devices and RAM disk devices too |
| `-f, --fs` | Output info about filesystems. This option is equivalent to `-o NAME,FSTYPE,FSVER,LABEL,UUID,FSAVAIL,FSUSE%,MOUNTPOINTS` |
| `-J, --json` | Use JSON output format |
| `-l, --list` | Produce output in the form of a list |
| `-N, --nvme` | Output info about NVMe devices only |
| `-o, --output list` | Specify which output columns to print |
| `-p, --paths` | Print full device paths |
## Output Columns
| Output | Description |
| ------------ | ------------------------------------------------- |
| ALIGNMENT | alignment offset |
| ID-LINK | the shortest udev /dev/disk/by-id link name |
| ID | udev ID (based on ID-LINK) |
| DISC-ALN | discard alignment offset |
| DAX | dax-capable device |
| DISC-GRAN | discard granularity |
| DISK-SEQ | disk sequence number |
| DISC-MAX | discard max bytes |
| DISC-ZERO | discard zeroes data |
| FSAVAIL | filesystem size available |
| FSROOTS | mounted filesystem roots |
| FSSIZE | filesystem size |
| FSTYPE | filesystem type |
| FSUSED | filesystem size used |
| FSUSE% | filesystem use percentage |
| FSVER | filesystem version |
| GROUP | group name |
| HCTL | Host:Channel:Target:Lun for SCSI |
| HOTPLUG | removable or hotplug device (usb, pcmcia, ...) |
| KNAME | internal kernel device name |
| LABEL | filesystem LABEL |
| LOG-SEC | logical sector size |
| MAJ:MIN | major:minor device number |
| MIN-IO | minimum I/O size |
| MODE | device node permissions |
| MODEL | device identifier |
| MQ | device queues |
| NAME | device name |
| OPT-IO | optimal I/O size |
| OWNER | user name |
| PARTFLAGS | partition flags |
| PARTLABEL | partition LABEL |
| PARTN | partition number as read from the partition table |
| PARTTYPE | partition type code or UUID |
| PARTTYPENAME | partition type name |
| PARTUUID | partition UUID |
| PATH | path to the device node |
| PHY-SEC | physical sector size |
| PKNAME | internal parent kernel device name |
| PTTYPE | partition table type |
| PTUUID | partition table identifier (usually UUID) |
| RA | read-ahead of the device |
| RAND | adds randomness |
| REV | device revision |
| RM | removable device |
| RO | read-only device |
| ROTA | rotational device |
| RQ-SIZE | request queue size |
| SCHED | I/O scheduler name |
| SERIAL | disk serial number |
| SIZE | size of the device |
| START | partition start offset |
| STATE | state of the device |
| SUBSYSTEMS | de-duplicated chain of subsystems |
| MOUNTPOINT | where the device is mounted |
| MOUNTPOINTS | all locations where device is mounted |
| TRAN | device transport type |
| TYPE | device type |
| UUID | filesystem UUID |
| VENDOR | device vendor |
| WSAME | write same max bytes |
| WWN | unique storage identifier |
| ZONED | zone model |
| ZONE-SZ | zone size |
| ZONE-WGRAN | zone write granularity |
| ZONE-APP | zone append max bytes |
| ZONE-NR | number of zones |
| ZONE-OMAX | maximum number of open zones |
| ZONE-AMAX | maximum number of active zones |