安装lvm
```
yum install -y lvm
```
查看磁盘
```
[root@template ~]# fdisk -l
Disk /dev/vda: 10.7 GB, 10737418240 bytes, 20971520 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: 0x000beec6
Device Boot Start End Blocks Id System
/dev/vda1 * 2048 2099199 1048576 83 Linux
/dev/vda2 2099200 20971519 9436160 8e Linux LVM
Disk /dev/vdb: 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-root: 8585 MB, 8585740288 bytes, 16769024 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: 1073 MB, 1073741824 bytes, 2097152 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
```
初始化
```
[root@template ~]# fdisk /dev/vdb
Welcome to fdisk (util-linux 2.23.2).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.
Device does not contain a recognized partition table
Building a new DOS disklabel with disk identifier 0xda419f51.
Command (m for help): o
Building a new DOS disklabel with disk identifier 0x01d037f1.
Command (m for help): n
Partition type:
p primary (0 primary, 0 extended, 4 free)
e extended
Select (default p):
Using default response p
Partition number (1-4, default 1):
First sector (2048-104857599, default 2048):
Using default value 2048
Last sector, +sectors or +size{K,M,G} (2048-104857599, default 104857599):
Using default value 104857599
Partition 1 of type Linux and of size 50 GiB is set
Command (m for help): t
Selected partition 1
Hex code (type L to list all codes): 8e
Changed type of partition 'Linux' to 'Linux LVM'
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
```
将磁盘添加到LVM PV
```
[root@template ~]# pvcreate /dev/vdb1
Physical volume "/dev/vdb1" successfully created.
```
列出所有PV
```
[root@template ~]# pvscan
PV /dev/vda2 VG centos lvm2 [<9.00 GiB / 0 free]
PV /dev/vdb1 lvm2 [<50.00 GiB]
Total: 2 [<59.00 GiB] / in use: 1 [<9.00 GiB] / in no VG: 1 [<50.00 GiB]
```
显示pv更多信息
```
[root@template ~]# pvdisplay /dev/vdb1
"/dev/vdb1" is a new physical volume of "<50.00 GiB"
--- NEW Physical volume ---
PV Name /dev/vdb1
VG Name
PV Size <50.00 GiB
Allocatable NO
PE Size 0
Total PE 0
Free PE 0
Allocated PE 0
PV UUID 4kmSEn-kBZG-vMJc-T03x-aWfO-dEes-5prCUL
```
创建卷组：使用尽可能多的PV来创建VG
```
[root@template ~]# vgcreate share /dev/vdb1
Volume group "share" successfully created
```
列出所有VG
```
[root@template ~]# vgscan
Reading volume groups from cache.
Found volume group "share" using metadata type lvm2
Found volume group "centos" using metadata type lvm2
```
显示vg更多信息
```
[root@template ~]# vgdisplay share
--- Volume group ---
VG Name share
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 <50.00 GiB
PE Size 4.00 MiB
Total PE 12799
Alloc PE / Size 0 / 0
Free PE / Size 12799 / <50.00 GiB
VG UUID t9gVEp-02O6-IK40-oNxs-fdFC-nuA3-Y5NgNU
```
创建逻辑卷：使用VG创建任意数量的LV
```
[root@template ~]# lvcreate --size 49G --name vg_data share
Logical volume "vg_data" created.
```
列出所有LV
```
[root@template ~]# lvscan
ACTIVE '/dev/share/vg_data' [49.00 GiB] inherit
ACTIVE '/dev/centos/swap' [1.00 GiB] inherit
ACTIVE '/dev/centos/root' [<8.00 GiB] inherit
```
格式化
```
[root@template ~]# mkfs.ext4 /dev/share/vg_data
mke2fs 1.42.9 (28-Dec-2013)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
3211264 inodes, 12845056 blocks
642252 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=2162163712
392 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, 2654208,
4096000, 7962624, 11239424
Allocating group tables: done
Writing inode tables: done
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: done
```
创建需要挂载到的目录
```
[root@template ~]# mkdir -p /data
```
挂载
```
[root@template ~]# mount /dev/mapper/share-vg_data /data
```
查看
```
[root@template ~]# df -h
Filesystem Size Used Avail Use% Mounted on
devtmpfs 5.7G 0 5.7G 0% /dev
tmpfs 5.7G 0 5.7G 0% /dev/shm
tmpfs 5.7G 8.6M 5.7G 1% /run
tmpfs 5.7G 0 5.7G 0% /sys/fs/cgroup
/dev/mapper/centos-root 8.0G 1.8G 6.3G 22% /
/dev/vda1 1014M 231M 784M 23% /boot
tmpfs 1.2G 0 1.2G 0% /run/user/0
/dev/mapper/share-vg_data 49G 53M 46G 1% /data
```
开机自动挂载
```
[root@template ~]# vim /etc/fstab
/dev/mapper/share-vg_data /data ext4 defaults 0 0
```
增加100G到/data
```
[root@vmhost2 ~]# lvextend --size +500G --resizefs /dev/mapper/VGsdb1T-vm_main
Size of logical volume VGsdb1T/vm_main changed from 400.00 GiB (102400 extents) to 900.00 GiB (230400 extents).
Logical volume VGsdb1T/vm_main successfully resized.
resize2fs 1.42.9 (28-Dec-2013)
Filesystem at /dev/mapper/VGsdb1T-vm_main is mounted on /data; on-line resizing required
old_desc_blocks = 50, new_desc_blocks = 113
The filesystem on /dev/mapper/VGsdb1T-vm_main is now 235929600 blocks long.
```
查看
```
df -h
```