lvm 创建pv，创建lv

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yum install lvm2 -y
fdisk -l
fdisk /dev/sdb
fdisk -l
vgcreate VolGroup00 /dev/sdb1
vgs
lvcreate -L 19.9G -n lv1 VolGroup00
lvdisplay
mkfs.xfs /dev/VolGroup00/lv1
# xfs在创建mysql实例时使用，会有更好的性能表现和可扩展性，默认可以使用ext4
mount /dev/VolGroup00/lv1 /data
blkid /dev/VolGroup00/lv1
vim /etc/fstab #修改fstab加载开机引导
UUID=c4f76c9b-5551-4124-a997-777e295eb9d6 /back                   xfs     defaults        0 0
/dev/VolGroup00/lv1  /data                  xfs     defaults        0 0

lvm扩展

ext4格式

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vgextend VolGroup00 /dev/sdc
vgs
lvextend -L +1G /dev/VolGroup00/lv1
resize2fs /dev/VolGroup00/lv1

xfs格式

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vgextend VolGroup00 /dev/sdc
vgs
lvextend -L +1G /dev/VolGroup00/lv1
xfs_growfs /dev/VolGroup00/lv1

机器重置后，硬盘上的lvm分区还在，挂载到本机。
Activating and Mounting the Original Logical Volume

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[root@tng3-1 ~]# lvchange -a y /dev/VolGroup00/lv1

[root@tng3-1 ~]# mount /dev/VolGroup00/lv1 /mnt
[root@tng3-1 ~]# df
Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/yourvg/yourlv    24507776        32  24507744   1% /mnt
/dev/VolGroup00/lv1        24507776        32  24507744   1% /mnt

ref:
CentOS 6.3下配置LVM（逻辑卷管理）
stackoverflow xfs调整lvm
Activating and Mounting the Original Logical Volume