linux查看磁盘信息

[root@centos4 ~]# lsblk
NAME            MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
sda               8:0    0   20G  0 disk
├─sda1            8:1    0    1G  0 part /boot
└─sda2            8:2    0   19G  0 part
  ├─centos-root 253:0    0   17G  0 lvm  /
  └─centos-swap 253:1    0    2G  0 lvm  [SWAP]
sr0              11:0    1  4.2G  0 rom  
[root@centos4 ~]# df -h
Filesystem               Size  Used Avail Use% Mounted on
/dev/mapper/centos-root   17G  3.6G   14G  21% /
devtmpfs                 478M     0  478M   0% /dev
tmpfs                    489M     0  489M   0% /dev/shm
tmpfs                    489M  7.0M  482M   2% /run
tmpfs                    489M     0  489M   0% /sys/fs/cgroup
/dev/sda1               1014M  143M  872M  15% /boot
tmpfs                     98M     0   98M   0% /run/user/0
[root@centos4 ~]# fdisk -l

Disk /dev/sda: 21.5 GB, 21474836480 bytes, 41943040 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: 0x00081e99

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *        2048     2099199     1048576   83  Linux
/dev/sda2         2099200    41943039    19921920   8e  Linux LVM

Disk /dev/mapper/centos-root: 18.2 GB, 18249416704 bytes, 35643392 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: 2147 MB, 2147483648 bytes, 4194304 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

[root@centos4 ~]#

创建分区：

fdisk /dev/vdb (创建一个500M 的分区)

partprobe /dev/vdb
创建逻辑卷：

pvcreate /dev/vdb1
vgcreate vg /dev/vdb1

lvcreate -L 100M -n vo vg
刷文件系统：

mkfs.ext4 /dev/vg/vo 

创建挂载点挂载：

mkdir /mnt/vo
echo "/dev/vg/vo /mnt/vo ext4 defaults 0 0" >> /etc/fstab
mount -a

创建 vo 后，可以调整逻辑卷：
lvextend -r -L +190M /dev/vg/vo