1, see block device information command: lsblk

1) Simple usage:

    lsblk command to list the information available block devices , such as we are talking about logical disk, by default will list all block devices tree.

[root@vms002 /]# lsblk
NAME   MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
sda      8:0    0  100G  0 disk 
├─sda1   8:1    0   40G  0 part /
└─sda2   8:2    0    4G  0 part [SWAP]
sr0 11: 0 1 0 3.6G rom / mnt

 2) lsblk options:

lsblk --help

[root@vms002 /]# lsblk --help

usage:
 lsblk [options] [<device> ...]

Options:
 -a, --all print all equipment
 -b, --bytes in bytes rather than readable format to print SIZE
 -d, --nodeps not print the slave device (slave) device or placeholder (Holder)
 -D, discard ability --discard Print
 -e, --exclude <list> The master device negative number (default: RAM disk)
 -I, --include <list> show only the specified device major number
 -f, --fs output file system information
 -h, --help usage information (this information)
 -i, --ascii only use ascii characters
 -m, --perms output permission information
 -l, --list use the output format list
 -n, --noheadings no header
 -o, --output <list> column output
 -p, --paths print the complete device path
 -P, --pairs using key = "value" Output Format
 -r, --raw output format using the native
 -s, --inverse antidependence
 -t, --topology output topology information
 -S, --scsi output information about SCSI devices

 -h, --help display this help and exit
 -V, --version output version information and exit

2, view the file system disk space usage command: df

1) common options:

Options

meaning

-a

Display all file system information, including system holding / proc , / the sysfs like file system;

-m

In MB units of display capacity;

-k

In KB Displays capacity Default in KB units;

-h

People used to use the KB , MB or GB and other units to display their own capacity;

-T

Displays the name of the file system partition;

-i

Do not show the hard disk capacity, but containing inode number to display ( inode information)

2) Example:

① -a option:

[root@vms002 /]# df -a
File System Used Available 1K- block with the mount point%
rootfs         41922560 3300768 38621792    8% /
percent 0 0 0 - / proc
sysfs                 0       0        0     - /sys
devtmpfs        2007776       0  2007776    0% /dev
securityfs            0       0        0     - /sys/kernel/security
tmpfs           2016816     148  2016668    1% /dev/shm
devpts                0       0        0     - /dev/pts
tmpfs           2016816    9016  2007800    1% /run
tmpfs           2016816       0  2016816    0% /sys/fs/cgroup
cgroup                0       0        0     - /sys/fs/cgroup/systemd
pstore                0       0        0     - /sys/fs/pstore
cgroup                0       0        0     - /sys/fs/cgroup/cpuset
cgroup                0       0        0     - /sys/fs/cgroup/cpu,cpuacct
cgroup                0       0        0     - /sys/fs/cgroup/memory
cgroup                0       0        0     - /sys/fs/cgroup/devices
cgroup                0       0        0     - /sys/fs/cgroup/freezer
cgroup                0       0        0     - /sys/fs/cgroup/net_cls
cgroup                0       0        0     - /sys/fs/cgroup/blkio
cgroup                0       0        0     - /sys/fs/cgroup/perf_event
cgroup                0       0        0     - /sys/fs/cgroup/hugetlb
configfs              0       0        0     - /sys/kernel/config
/dev/sda1      41922560 3300768 38621792    8% /
selinuxfs             0       0        0     - /sys/fs/selinux
systemd-1             0       0        0     - /proc/sys/fs/binfmt_misc
mqueue                0       0        0     - /dev/mqueue
hugetlbfs             0       0        0     - /dev/hugepages
debugfs               0       0        0     - /sys/kernel/debug
gvfsd-fuse            0       0        0     - /run/user/1000/gvfs
fusectl               0       0        0     - /sys/fs/fuse/connections
/ Dev / sr0 3,798,292 3,798,292 0,100% / mnt

② -hT options:

[root@vms002 /]# df -hT
File system type available capacity has been used with a mount point%
/dev/sda1      xfs        40G  3.2G   37G    8% /
devtmpfs       devtmpfs  2.0G     0  2.0G    0% /dev
tmpfs          tmpfs     2.0G  148K  2.0G    1% /dev/shm
tmpfs          tmpfs     2.0G  8.9M  2.0G    1% /run
tmpfs          tmpfs     2.0G     0  2.0G    0% /sys/fs/cgroup
/ Dev / sr0 iso9660 3.7G 3.7G 0 100% / mnt

③ -ihT options:

[Root @ vms002 /] # df -ihT
Used Inode file system type (I) can be used (I) has a mount point (I)%
/dev/sda1      xfs        40M    109K     40M       1% /
devtmpfs       devtmpfs  491K     326    490K       1% /dev
tmpfs          tmpfs     493K       8    493K       1% /dev/shm
tmpfs          tmpfs     493K     454    492K       1% /run
tmpfs          tmpfs     493K      13    493K       1% /sys/fs/cgroup
/dev/sr0       iso9660      0       0       0        - /mnt