1 、背景

在企业中有时我们为方便安装软件、数据的管理，需要把安装软件、数据放到固定目录下，磁盘满了方便扩展，这里假如需要一个/data目录存放数据，并单独进行挂载。

2、操作步骤

2.1  划分磁盘

请参考（1-7部分）

http://www.cnblogs.com/heruiguo/p/7943537.html

2.2 创建PV

[root@centos-6 ~]# pvcreate /dev/sdb1

Physical volume "/dev/sdb1" successfully created

扫描系统PV可以使用pvscan查看新建的PV

[root@centos-6 ~]# pvscan

PV /dev/sda2 VG VolGroup lvm2 [19.51 GiB / 0 free]

PV /dev/sdb1 lvm2 [10.00 GiB]

Total: 2 [29.51 GiB] / in use: 1 [19.51 GiB] / in no VG: 1 [10.00 GiB]

2.3 创建VG

[root@centos-6 ~]# vgcreate vgtest /dev/sdb1

Volume group "vgtest" successfully created

注释：vgtest 为VG的名称

扫描vg

[root@centos-6 ~]# vgscan

Reading all physical volumes. This may take a while...

Found volume group "vgtest" using metadata type lvm2

Found volume group "VolGroup" using metadata type lvm2

查看vg

[root@centos-6 ~]# vgdisplay

--- Volume group ---

VG Name vgtest

System ID

Format lvm2

Metadata Areas 1

Metadata Sequence No 1

VG Access read/write

VG Status resizable

MAX LV 0

Cur LV 0

Open LV 0

Max PV 0

Cur PV 1

Act PV 1

VG Size 10.00 GiB

PE Size 4.00 MiB

Total PE 2560

Alloc PE / Size 0 / 0

Free PE / Size 2560 / 10.00 GiB

VG UUID 59Z2ML-CEzB-PivW-zNq9-2kbv-hscJ-drFdR9

--- Volume group ---

VG Name VolGroup

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 19.51 GiB

PE Size 4.00 MiB

Total PE 4994

Alloc PE / Size 4994 / 19.51 GiB

Free PE / Size 0 / 0

VG UUID UPJDXo-8RjG-muVj-nVnt-hjXI-aZVv-uGGc2x

2.4 创建LV

[root@centos-6 ~]# lvcreate -l 2560 -n lvdata vgtest

Logical volume "lvdata" created.

 

2.5 格式化创建的LV

[root@centos-6 ~]# mkfs -t ext4 /dev/vgtest/lvdata

mke2fs 1.41.12 (17-May-2010)

文件系统标签=

操作系统:Linux

块大小=4096 (log=2)

分块大小=4096 (log=2)

Stride=0 blocks, Stripe width=0 blocks

655360 inodes, 2621440 blocks

131072 blocks (5.00%) reserved for the super user

第一个数据块=0

Maximum filesystem blocks=2684354560

80 block groups

32768 blocks per group, 32768 fragments per group

8192 inodes per group

Superblock backups stored on blocks:

32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632

正在写入inode表: 完成

Creating journal (32768 blocks): 完成

Writing superblocks and filesystem accounting information: 完成

This filesystem will be automatically checked every 39 mounts or

180 days, whichever comes first. Use tune2fs -c or -i to override.

2.6 创建目录并挂载

创建目录： 

[root@centos-6 ~]# mkdir -p  /data

挂载目录

[root@centos-6 ~]# mount  /dev/vgtest/lvdata   /data

查看

[root@centos-6 ~]# df -h

Filesystem Size Used Avail Use% Mounted on

/dev/mapper/VolGroup-lv_root    18G 4.9G 12G 30% /

tmpfs 125M 72K    125M 1% /dev/shm

/dev/sda1 477M 37M 416M  9% /boot

/dev/mapper/vgtest-lvdata   9.8G 23M 9.2G 1% /data

2.7 设置开机挂载

[root@centos-6 ~]# vi /etc/fstab

#

# /etc/fstab

# Created by anaconda on Sat Feb 3 00:44:14 2018

#

# 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/VolGroup-lv_root / ext4 defaults 1 1

UUID=49120546-3d8d-4b2e-8559-448613dc072a /boot ext4 defaults 1 2

/dev/mapper/VolGroup-lv_swap swap swap defaults 0 0

tmpfs /dev/shm tmpfs defaults 0 0

devpts /dev/pts devpts gid=5,mode=620 0 0

sysfs /sys sysfs defaults 0 0

proc /proc proc defaults 0 0

/dev/mapper/vgtest-lvdata /data ext4 defaults 0 0