磁盘使用情况查看

一.查看磁盘使用情况

通过使用lsblk查看磁盘,情况,并列出磁盘以及分区. df -h可以看出每个磁盘的占用情况. 

查看随机启动的系统:

[root@PD-WEB-01-VT home]# cat /etc/fstab

#
# /etc/fstab
# Created by anaconda on Wed Aug  7 15:29:17 2019
#
# Accessible filesystems, by reference, are maintained under '/dev/disk'
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
#
/dev/mapper/centos-root /                       xfs     defaults        0 0
UUID=616875ce-f01b-4e85-8244-a40f10bc8021 /boot                   xfs     defaults        0 0
/dev/mapper/centos-home /home                   xfs     defaults        0 0
/dev/mapper/centos-swap swap                    swap    defaults        0 0
/dev/vg01/lvm01 /work   ext4    defaults 0 0

 

1. lsblk命令: 

lsblk命令用于列出所有可用块设备的信息，而且还能显示他们之间的依赖关系，但是它不会列出RAM盘的信息。块设备有硬盘，闪存盘，cd-ROM等等。lsblk命令包含在util-linux-ng包中，现在该包改名为util-linux。这个包带了几个其它工具，如dmesg。要安装lsblk，请在此处下载util-linux包。Fedora用户可以通过命令sudo yum install util-linux-ng来安装该包。

[root@PD-WEB-01-VT ~]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 100G 0 disk
├─sda1 8:1 0 1G 0 part /boot
└─sda2 8:2 0 99G 0 part
├─centos-root 253:0 0 50G 0 lvm /
├─centos-swap 253:1 0 3.9G 0 lvm [SWAP]
└─centos-home 253:2 0 45.1G 0 lvm /home
sdb 8:16 0 100G 0 disk
└─sdb1 8:17 0 100G 0 part
└─vg01-lvm01 253:3 0 100G 0 lvm /work
sr0 11:0 1 1024M 0 rom

2.df -h  :显示磁盘使用情况

[root@PD-WEB-01-VT ~]# df -h
Filesystem               Size  Used Avail Use% Mounted on
/dev/mapper/centos-root   50G  2.7G   48G   6% /
devtmpfs                 3.8G     0  3.8G   0% /dev
tmpfs                    3.9G     0  3.9G   0% /dev/shm
tmpfs                    3.9G   12M  3.8G   1% /run
tmpfs                    3.9G     0  3.9G   0% /sys/fs/cgroup
/dev/sda1               1014M  142M  873M  14% /boot
/dev/mapper/centos-home   46G   33M   46G   1% /home
/dev/mapper/vg01-lvm01    99G   61M   94G   1% /work
overlay                   50G  2.7G   48G   6% /var/lib/docker/overlay2/6255b4bdc94f51aed5539c956570a5ab955b2130610b96472a24c5fcd76b894d/merged
tmpfs                    781M     0  781M   0% /run/user/1000

3. fdisk -l 

Linux下的fdisk功能是极其强大的，用它可以划分出最复杂的分区，下面简要介绍一下它的用法：

 这个颜色代表分区表,如果Disk磁盘下没有,那么说明这个磁盘还没有分区

[root@PD-WEB-01-VT ~]# fdisk -l

Disk /dev/sda: 107.4 GB, 107374182400 bytes, 209715200 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x0009f3ee

Device Boot Start End Blocks Id System
/dev/sda1 * 2048 2099199 1048576 83 Linux
/dev/sda2 2099200 209715199 103808000 8e Linux LVM

Disk /dev/sdb: 107.4 GB, 107374182400 bytes, 209715200 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x1669065c

Device Boot Start End Blocks Id System
/dev/sdb1 2048 209715199 104856576 8e Linux LVM

Disk /dev/mapper/centos-root: 53.7 GB, 53687091200 bytes, 104857600 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk /dev/mapper/centos-swap: 4160 MB, 4160749568 bytes, 8126464 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk /dev/mapper/centos-home: 48.4 GB, 48444211200 bytes, 94617600 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk /dev/mapper/vg01-lvm01: 107.4 GB, 107369988096 bytes, 209707008 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes