lvm分区创建和扩容

shell> fdisk /dev/xvdb                               #### 选择磁盘
Command (m for help): m                              #### 帮助
Command action
   a   toggle a bootable flag
   b   edit bsd disklabel
   c   toggle the dos compatibility flag
   d   delete a partition
   l   list known partition types
   m   print this menu
   n   add a new partition
   o   create a new empty DOS partition table
   p   print the partition table
   q   quit without saving changes
   s   create a new empty Sun disklabel
   t   change a partition's system id
   u   change display/entry units
   v   verify the partition table
   w   write table to disk and exit
   x   extra functionality (experts only)
Command (m for help): n                               #### 创建新的分区
Command action
   e   extended
   p   primary partition (1-4)
p                                                     #### 创建主分区
Partition number (1-4):1                              #### 分区ID
First cylinder (1-65270, default 1): 
Using default value 1
Last cylinder, +cylinders or +size{K,M,G} (1-65270, default 65270): 
Using default value 65270

Command (m for help):t                                 #### 修改分区类型
Command (m for help):8e                                #### Linux lvm
Command (m for help):w                                 #### 保存修改
shell> pvcreate /dev/xvdb1/                            #### 创建新的pv卷
shell> pvs                                             #### 查看pv卷
shell> vgcreate VolGroup01 /dev/xvdb1/                 #### 创建新的vg卷
shell> vgs                                             #### 查看vg卷
shell> lvcreate -L 50G -n lvmServer    VolGroup01      #### 创建逻辑卷 -L 指定分区大小 -n 指定lvm名称
shell> mkfs.ext4 /dev/VolGroup01/lvmServer             #### 使用mkfs.ext4命令在逻辑卷lvmServer上创建ext4文件系统
shell> mount /dev/VolGroup01/lvmServer /server/        #### 挂在分区到本地目录/server
shell> vi /etc/fstab                                   #### 修改fstab 开机自动挂载
#
# /etc/fstab
# Created by anaconda on Thu Aug 14 21:16:42 2014
#
# 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
#
UUID=94e4e384-0ace-437f-bc96-057dd64f42ee / ext4 defaults,barrier=0 1 1
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/VolGroup01/lvmServer       /server         ext4    defaults        0 0
:wq
#### 保存重启测试 
注意：
* fstab一定要正确填写路径,一旦出错,可能无法正常启动.
* 可以在rc.local使用mount命令进行挂载

　扩容

   参考地址:https://www.cnblogs.com/jackruicao/p/6258820.html

   注意 xfs重新定义分区大小如果是xfs分区执行

  lvcreate  -l 100%FREE  -n lvmserver tid

这样扩展 就不需要再使用 xfs_growfs/resize2fs

lvextend -r -l +100%free /dev/mapper/vg1-vg1