**环境 文件系统
CentOS 7 XFS
1.1查看虚拟机(以下操作在宿主机上)**

[root@office-prd-kvm-01 ~]# virsh list
4     office-com-ldap-01             running

1.2查看虚拟机系统盘

[root@office-prd-kvm-01 ~]# virsh domblklist office-com-ldap-01 
目标     源
------------------------------------------------
vda        /home/office-com-ldap-01/office-com-ldap-01.system.qcow2
hda  

1.3原始系统盘大小

[root@office-prd-kvm-01 ~]# qemu-img info /home/office-com-ldap-01/office-com-ldap-01.system.qcow2
virtual size: 15G (16106127360 bytes)
#很重要要先关闭虚拟机
[root@office-prd-kvm-01 ~]# virsh shutdown office-com-ldap-01 

1.4扩容磁盘

[root@office-prd-kvm-01 ~]# qemu-img resize /home/office-com-ldap-01/office-com-ldap-01.system.qcow2 +5G
[root@office-prd-kvm-01 ~]# qemu-img info /home/office-com-ldap-01/office-com-ldap-01.system.qcow2
virtual size: 20G (21474836480 bytes)
[root@office-prd-kvm-01 ~]# virsh start office-com-ldap-01

二.虚拟机内查看(以下操作在kvm虚拟机中)

2.1查看是否增加

[root@office-prd-kvm-01 ~]# lsblk

2.2给未分配的空间分区

[root@office-prd-kvm-01 ~]# fdisk /dev/vda

命令(输入 m 获取帮助):n
Select (default p):p
命令(输入 m 获取帮助):t
Hex 代码(输入 L列出所有代码):l

Hex代码 (输入 L 列出所有代码):8e
命令(输入 m 获取帮助):p
命令(输入 m 获取帮助):w

2.3刷新分区表

[root@office-com-ldap-01 ~]# partprobe 

2.4添加到卷组(dev/centos/root)

[root@office-com-ldap-01 ~]# pvcreate /dev/vda3
  Physical volume "/dev/vda3" successfully created.
[root@office-com-ldap-01 ~]# pvs
  PV         VG     Fmt  Attr PSize  PFree
  /dev/vda2  centos lvm2 a--  <9.00g    0 
  /dev/vda3         lvm2 ---   5.00g 5.00g
[root@office-com-ldap-01 ~]# vgextend centos /dev/vda3
  Volume group "centos" successfully extended
[root@office-com-ldap-01 ~]# vgs
  VG     #PV #LV #SN Attr   VSize  VFree 
  centos   2   2   0 wz--n- 13.99g <5.00g
[root@office-com-ldap-01 ~]# lvextend -l +100%FREE /dev/mapper/centos-root
  New size given (1279 extents) not larger than existing size (2047 extents)
[root@office-com-ldap-01 ~]# xfs_growfs /dev/mapper/centos-root
[root@office-com-ldap-01 ~]# df -Th

[post cid="32" /]