1.通過圖形界面“虛擬機管理器”添加虛擬磁盤
2.字符界面：
添加一塊qcow2
[root@localhost ~]# qemu-img create -f qcow2 kvm-clone.qcow2 2G
Formatting 'kvm-clone.qcow2', fmt=qcow2 size=2147483648 encryption=off cluster_size=65536
在配置文件添加磁盤：
[root@localhost ~]# virsh edit CentOS-virt-clone
virsh edit centos-virt-clone
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='none'/>
<source file='/root/kvm-clone-add.qcow2' />
<target dev='vdb' bus='virtio'/>
</disk>
開啟虛擬機，發生錯誤：
[root@localhost ~]# virsh start centos-virt-clone
錯誤：開始域 centos-virt-clone 失敗
錯誤：internal error Process exited while reading console log output: char device redirected to /dev/pts/2
2015-02-02T11:13:45.039620Z qemu-kvm: -drive file=/root/kvm-clone.qcow2,if=none,id=drive-virtio-disk3,format=qcow2,cache=none: could not open disk image /root/kvm-clone.qcow2: Permission denied
重啟“libvirtd”
vim /etc/libvir
user = "root"
# The group for QEMU processes run by the system instance. It can be
# specified in a similar way to user.
group = "root"
dynamic_ownership = 0
[root@localhost ~]# /etc/init.d/libvirtd restart
開啟虛擬機：
[root@localhost ~]# virsh start centos-virt-clone
域 centos-virt-clone 已開始
3.在線添加虛擬磁盤：
virsh attach-disk oeltest02 /data/test02_add01.qcow2 sdb --cache=none --subdriver=qcow2
查看磁盤分區：
--------------------------------------分割線 --------------------------------------
KVM中Linux虛擬機的硬盤添加方法 http://www.linuxidc.com/Linux/2013-02/80067.htm
Linux入門學習教程：虛擬機體驗之KVM篇 http://www.linuxidc.com/Linux/2015-03/114462.htm
RHEL6 KVM虛擬化創建橋接網卡-網橋 http://www.linuxidc.com/Linux/2013-08/88517.htm
RedHat Linux KVM虛擬機橋接 http://www.linuxidc.com/Linux/2013-02/79934.htm
CentOS 5.6下KVM的安裝/橋接設置/虛擬機創建及運行 http://www.linuxidc.com/Linux/2012-12/76883.htm
Ubuntu下用libvirt安裝KVM虛擬機時找不到/bin/qemu-kvm問題解決 http://www.linuxidc.com/Linux/2013-08/88985.htm
RedHat6.5下安裝配置KVM虛擬機 http://www.linuxidc.com/Linux/2014-10/107972.htm
--------------------------------------分割線 --------------------------------------
