Linux 磁盘命令

1. fdisk -l 显示所有磁盘

[[email protected] ~]# fdisk -l

磁盘 /dev/sda：549.8 GB, 549755813888 字节，1073741824 个扇区
Units = 扇区 of 1 * 512 = 512 bytes
扇区大小(逻辑/物理)：512 字节 / 512 字节
I/O 大小(最小/最佳)：512 字节 / 512 字节
磁盘标签类型：dos
磁盘标识符：0x000d7fc1

   设备 Boot      Start         End      Blocks   Id  System
/dev/sda1   *        2048     2099199     1048576   83  Linux
/dev/sda2         2099200    41943039    19921920   8e  Linux LVM
/dev/sda3        41943040  1073741823   515899392   83  Linux

磁盘 /dev/mapper/centos-root：18.2 GB, 18249416704 字节，35643392 个扇区
Units = 扇区 of 1 * 512 = 512 bytes
扇区大小(逻辑/物理)：512 字节 / 512 字节
I/O 大小(最小/最佳)：512 字节 / 512 字节


磁盘 /dev/mapper/centos-swap：2147 MB, 2147483648 字节，4194304 个扇区
Units = 扇区 of 1 * 512 = 512 bytes
扇区大小(逻辑/物理)：512 字节 / 512 字节
I/O 大小(最小/最佳)：512 字节 / 512 字节

2 fdisk /dev/sda 分区

3 vgdisplay 查看卷组

[[email protected] ~]#  vgdisplay
  --- Volume group ---
  VG Name               centos
  System ID             
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  3
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                2
  Open LV               2
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               <19.00 GiB
  PE Size               4.00 MiB
  Total PE              4863
  Alloc PE / Size       4863 / <19.00 GiB
  Free  PE / Size       0 / 0   
  VG UUID               5CPnC1-vu0S-0azF-DaTg-hi3u-kLRT-GeoKpV

4 . pvdisplay 物理卷

[[email protected] ~]#  pvdisplay
  --- Physical volume ---
  PV Name               /dev/sda2
  VG Name               centos
  PV Size               <19.00 GiB / not usable 3.00 MiB
  Allocatable           yes (but full)
  PE Size               4.00 MiB
  Total PE              4863
  Free PE               0
  Allocated PE          4863
  PV UUID               Z0Xemc-hA5J-afVQ-2SJc-siNF-Dzrt-5gHF0y

5.lvdisplay 逻辑卷

[[email protected] ~]# lvdisplay
  --- Logical volume ---
  LV Path                /dev/centos/swap
  LV Name                swap
  VG Name                centos
  LV UUID                T5LgWb-Ms7I-T0QN-Isdr-cda3-0Ax3-nM4Jp0
  LV Write Access        read/write
  LV Creation host, time localhost, 2019-10-25 13:06:49 +0800
  LV Status              available
  # open                 2
  LV Size                2.00 GiB
  Current LE             512
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     8192
  Block device           253:1
   
  --- Logical volume ---
  LV Path                /dev/centos/root
  LV Name                root
  VG Name                centos
  LV UUID                U41UO2-2lvo-cpY7-k8is-u4qh-SAYC-rerShQ
  LV Write Access        read/write
  LV Creation host, time localhost, 2019-10-25 13:06:50 +0800
  LV Status              available
  # open                 1
  LV Size                <17.00 GiB
  Current LE             4351
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     8192
  Block device           253:0

6. pvcreate /dev/sda3

创建物理卷

7.vgextend centos /dev/sda3

将物理卷/dev/sda3加入卷组centos

8. lvextend -l +10240 /dev/centos/root

为逻辑卷/dev/centos/root增加空间

9. resize2fs -f /dev/centos/root

10 xfs_growfs /dev/centos/root

11 du -h -d 1

查看目录中文件所占空间

[[email protected] ~]# du -h -d 1
26M	./.cache
8.0K	./.dbus
96K	./.config
1.5M	./.local
0	./桌面
0	./下载
0	./模板
0	./公共
0	./文档
0	./音乐
0	./图片
0	./视频
63M	./.mozilla
0	./.pki
12K	./.gnupg
8.0K	./.ssh
4.0K	./.oracle_jre_usage
0	./application
48K	./.java
8.0K	./tmp
90M	.

12 df -h

查看分区

[[email protected] ~]# df  -h
文件系统                 容量  已用  可用 已用% 挂载点
devtmpfs                 3.9G     0  3.9G    0% /dev
tmpfs                    3.9G     0  3.9G    0% /dev/shm
tmpfs                    3.9G   18M  3.9G    1% /run
tmpfs                    3.9G     0  3.9G    0% /sys/fs/cgroup
/dev/mapper/centos-root   17G  8.2G  8.9G   48% /
/dev/sda1               1014M  237M  778M   24% /boot
/dev/sda3                485G  433G   28G   95% /anjj
tmpfs                    783M   12K  783M    1% /run/user/42
tmpfs                    783M     0  783M    0% /run/user/0