lvm卷扩容

给虚拟机的根目录下，添加40G磁盘空间。

查询当前磁盘情况

~]# df -h
Filesystem               Size  Used Avail Use% Mounted on
/dev/mapper/centos-root  8.0G  1.9G  6.2G  24% /

~]# fdisk -l

Disk /dev/sda: 53.7 GB, 53687091200 bytes, 104857600 sectors
........
   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *        2048     2099199     1048576   83  Linux
/dev/sda2         2099200    20971519     9436160   8e  Linux LVM

添加的磁盘空间分区为sda3

~]# fdisk /dev/sda
......
Command (m for help): n     #新建分区
Partition type:
   p   primary (2 primary, 0 extended, 2 free)
   e   extended

Select (default p): p            #选择 primary
Partition number (3,4, default 3):     #需要新建的分区编号,回车为sda3
First sector (20971520-104857599, default 20971520):     #分区在磁盘的开始位置，回车默认
    Using default value 20971520
Last sector, +sectors or +size{K,M,G} (20971520-104857599, default 104857599): #分区在磁盘的结束位置，回车默认
    Using default value 104857599
    Partition 3 of type Linux and of size 40 GiB is set

Command (m for help): t                   #输入t修改分区类型
Partition number (1-3, default 3):          #需要修改的分区，回车为sda3
Hex code (type L to list all codes): 8e       #输入8e修改分区类型为LVM
    Changed type of partition 'Linux' to 'Linux LVM'

Command (m for help): w     #配置写入磁盘，并生效
    The partition table has been altered!
#运行partprobe命令或者重启主机

查询磁盘

[root@zabbix-3 ~]# fdisk -l

Disk /dev/sda: 53.7 GB, 53687091200 bytes, 104857600 sectors
......
  Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *        2048     2099199     1048576   83  Linux
/dev/sda2         2099200    20971519     9436160   8e  Linux LVM
/dev/sda3        20971520   104857599    41943040   8e  Linux LVM  #新加入的分区

查询当前vg组

~]# vgdisplay
  --- Volume group ---
  VG Name               centos     #当前vg组名
  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               <9.00 GiB  #vg容量

扩展lvm

#新建pv
~]# pvcreate /dev/sda3
    Physical volume "/dev/sda3" successfully created.
 ~]# pvs     #查询pv
    PV         VG     Fmt  Attr PSize  PFree 
    /dev/sda2  centos lvm2 a--  <9.00g     0 
    /dev/sda3         lvm2 ---  40.00g 40.00g     #新建的pv
  
#加入vg组
~]# vgextend centos /dev/sda3
    Volume group "centos" successfully extended
~]# vgs   #查询vg
    VG     #PV #LV #SN Attr   VSize  VFree  
    centos   2   2   0 wz--n- 48.99g <40.00g     #新建的pv ，已加入vg组

#扩展lvm卷
~]# lvextend -L +39.9G /dev/mapper/centos-root     #此数值应小于新建的pv
   Logical volume centos/root successfully resized.
~]# lvs   #查询lvm
    LV   VG     Attr       LSize   Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
    root centos -wi-ao---- <47.99g            #根目录挂载的lvm卷已扩展                                        
    swap centos -wi-ao----   1.00g  

扩展现有的XFS文件系统

 ~]# df -h     
Filesystem               Size  Used Avail Use% Mounted on
/dev/mapper/centos-root  8.0G  1.9G  6.2G  24% /          #查询扩展前

~]# xfs_growfs /dev/mapper/centos-root    #扩展现有的XFS文件系统
  meta-data=/dev/mapper/centos-root isize=512    agcount=24, agsize=524032 blks
           =                       sectsz=512   attr=2, projid32bit=1
           =                       crc=1        finobt=0 spinodes=0
  data     =                       bsize=4096   blocks=12450816, imaxpct=25
           =                       sunit=0      swidth=0 blks
  naming   =version 2              bsize=4096   ascii-ci=0 ftype=1
  log      =internal               bsize=4096   blocks=2560, version=2
           =                       sectsz=512   sunit=0 blks, lazy-count=1
  realtime =none                   extsz=4096   blocks=0, rtextents=0
  data blocks changed from 12450816 to 12579840

 ~]# df -h
  Filesystem               Size  Used Avail Use% Mounted on
  /dev/mapper/centos-root   48G  1.9G   47G   4% /  ##查询扩展后，扩展成功