df(1) - Linux manual page http://man7.org/linux/man-pages/man1/df.1.html
report file system disk space usage
This manual page documents the GNU version of df. df displays the
amount of disk space available on the file system containing each
file name argument. If no file name is given, the space available on
all currently mounted file systems is shown. Disk space is shown in
1K blocks by default, unless the environment variable POSIXLY_CORRECT
is set, in which case 512-byte blocks are used.
If an argument is the absolute file name of a disk device node
containing a mounted file system, df shows the space available on
that file system rather than on the file system containing the device
node. This version of df cannot show the space available on
unmounted file systems, because on most kinds of systems doing so
requires very nonportable intimate knowledge of file system
structures.
lsblk(8) - Linux manual page http://man7.org/linux/man-pages/man8/lsblk.8.html
list block devices
lsblk lists information about all available or the specified block
devices. The lsblk command reads the sysfs filesystem and udev db to
gather information. If the udev db is not available or lsblk is
compiled without udev support than it tries to read LABELs, UUIDs and
filesystem types from the block device. In this case root permissions
are necessary.
The command prints all block devices (except RAM disks) in a tree-
like format by default. Use lsblk --help to get a list of all
available columns.
The default output, as well as the default output from options like
--fs and --topology, is subject to change. So whenever possible, you
should avoid using default outputs in your scripts. Always
explicitly define expected columns by using --output columns-list in
environments where a stable output is required.
Note that lsblk might be executed in time when udev does not have all
information about recently added or modified devices yet. In this
case it is recommended to use udevadm settle before lsblk to
synchronize with udev.
[root@hadoop2 ~]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 931.5G 0 disk
├─sda1 8:1 0 200M 0 part
├─sda2 8:2 0 500M 0 part /boot
└─sda3 8:3 0 930.8G 0 part
├─VolGroup-lv_root (dm-0) 253:0 0 50G 0 lvm /
├─VolGroup-lv_swap (dm-1) 253:1 0 7.7G 0 lvm [SWAP]
└─VolGroup-lv_home (dm-2) 253:2 0 873.1G 0 lvm /home
[root@hadoop2 ~]# lsblk --help
Usage:
lsblk [options] [<device> ...]
Options:
-a, --all print all devices
-b, --bytes print SIZE in bytes rather than in human readable format
-d, --nodeps don't print slaves or holders
-D, --discard print discard capabilities
-e, --exclude <list> exclude devices by major number (default: RAM disks)
-I, --include <list> show only devices with specified major numbers
-f, --fs output info about filesystems
-h, --help usage information (this)
-i, --ascii use ascii characters only
-m, --perms output info about permissions
-l, --list use list format ouput
-n, --noheadings don't print headings
-o, --output <list> output columns
-P, --pairs use key="value" output format
-r, --raw use raw output format
-s, --inverse inverse dependencies
-t, --topology output info about topology
-V, --version output version information and exit
Available columns (for --output):
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
RA read-ahead of the device
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
For more details see lsblk(8).
[root@hadoop2 ~]# df
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/mapper/VolGroup-lv_root
51475068 46818364 2035264 96% /
tmpfs 3975284 0 3975284 0% /dev/shm
/dev/sda2 487652 80945 381107 18% /boot
/dev/mapper/VolGroup-lv_home
901020952 110191196 745053884 13% /home
[root@hadoop2 ~]# df --help
Usage: df [OPTION]... [FILE]...
Show information about the file system on which each FILE resides,
or all file systems by default.
Mandatory arguments to long options are mandatory for short options too.
-a, --all include dummy file systems
-B, --block-size=SIZE use SIZE-byte blocks
--direct show statistics for a file instead of mount point
--total produce a grand total
-h, --human-readable print sizes in human readable format (e.g., 1K 234M 2G)
-H, --si likewise, but use powers of 1000 not 1024
-i, --inodes list inode information instead of block usage
-k like --block-size=1K
-l, --local limit listing to local file systems
--no-sync do not invoke sync before getting usage info (default)
-P, --portability use the POSIX output format
--sync invoke sync before getting usage info
-t, --type=TYPE limit listing to file systems of type TYPE
-T, --print-type print file system type
-x, --exclude-type=TYPE limit listing to file systems not of type TYPE
-v (ignored)
--help display this help and exit
--version output version information and exit
Display values are in units of the first available SIZE from --block-size,
and the DF_BLOCK_SIZE, BLOCK_SIZE and BLOCKSIZE environment variables.
Otherwise, units default to 1024 bytes (or 512 if POSIXLY_CORRECT is set).
SIZE may be (or may be an integer optionally followed by) one of following:
KB 1000, K 1024, MB 1000*1000, M 1024*1024, and so on for G, T, P, E, Z, Y.
Report df bugs to bug-coreutils@gnu.org
GNU coreutils home page: <http://www.gnu.org/software/coreutils/>
General help using GNU software: <http://www.gnu.org/gethelp/>
For complete documentation, run: info coreutils 'df invocation'
[root@hadoop2 ~]#
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