LVM 类型的 Storage Pool
LVM 类型的 Storage Pool - 每天5分钟玩转 OpenStack（8）
LVM 类型的 Storage Pool
不仅一个文件可以分配给客户机作为虚拟磁盘，宿主机上 VG 中的 LV 也可以作为虚拟磁盘分配给虚拟机使用。
不过，LV 由于没有磁盘的 MBR 引导记录，不能作为虚拟机的启动盘，只能作为数据盘使用。
这种配置下，宿主机上的 VG 就是一个 Storage Pool，VG 中的 LV 就是 Volume。
LV 的优点是有较好的性能；不足的地方是管理和移动性方面不如镜像文件，而且不能通过网络远程使用。
下面举个例子。
首先，在宿主机上创建了一个容量为 10G 的 VG，命名为 HostVG。
然后创建了一个 Storage Pool 的定义文件 /etc/libvirt/storage/HostVG.xml，内容为
然后通过 virsh 命令创建新的 Storage Pool “HostVG”
并启用这个 HostVG
现在我们可以在 virt-manager 中为虚机 kvm1 添加 LV 的虚拟磁盘了。
点击 Browse
可以看到 HostVG 已经在 Stroage Pool 的列表中了，选择 HostVG
为 volume 命名为 newlv 并设置大小 100MB
点击 Finish，newlv 创建成功
点击 Choose Volume
点击 Finish 确认将 newlv 作为 volume 添加到 kvm1
新 volume 添加成功
在宿主机上则多了一个命名为newlv的LV
其他类型的Storage Pool
KVM 还支持 iSCSI，Ceph 等多种类型的 Storage Pool，这里就不一一介绍了，最常用的就是目录类型，其他类型可以参考文档http://libvirt.org/storage.html
下一节我们将开始讨论 KVM 的网络虚拟化原理
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