virsh命令有问题

Question

我一直在尝试使用virsh attah-disk附加qcow2文件作为附加存储源.我正在使用的语法是(来自互联网):

virsh attach-disk --driver file vm2 disk2.qcow2 hdc

如果vm正在运行或暂停,则显示:

error: this function is not supported by the hypervisor: disk bus 'ide' cannot be hotplugged.

如果vm关闭,则显示:

error: Requested operation is not valid: cannot attach device on inactive domain

我不确定hdc参数.我已尝试将attach-device功能与xml文件一起使用:

<disk type="file" device="disk">
    <driver name="file"/>
    <source file="/gfs1/disk2.qcow2"/>
    <target dev="hdc"/>
</disk>

但这也表明:

error: Failed to attach device from /gfs1/disk2tovm2.xml
error: this function is not supported by the hypervisor: disk bus 'ide' cannot be hotplugged.

我查看了许多示例,但它们都没有工作,并且语法几乎相同.如果有人可以帮我弄清楚错误.

VM的完整配置文件

root@blade1:/vms# virsh dumpxml vm2
<domain type='kvm' id='33'>
  <name>vm2</name>
  <uuid>70affd5d-af95-72c5-2d96-c131f46409b6</uuid>
  <description>--autostart</description>
  <memory>1048576</memory>
  <currentMemory>1048576</currentMemory>
  <vcpu>2</vcpu>
  <os>
    <type arch='i686' machine='pc-0.14'>hvm</type>
    <boot dev='hd'/>
  </os>
  <features>
    <acpi/>
    <apic/>
    <pae/>
  </features>
  <clock offset='utc'/>
  <on_poweroff>destroy</on_poweroff>
  <on_reboot>restart</on_reboot>
  <on_crash>restart</on_crash>
  <devices>
    <emulator>/usr/bin/kvm</emulator>
    <disk type='file' device='disk'>
      <driver name='qemu' type='qcow2'/>
      <source file='/vms/vm2.qcow2'/>
      <target dev='vda' bus='virtio'/>
      <alias name='virtio-disk0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
    </disk>
    <interface type='bridge'>
      <mac address='52:54:00:5e:98:e4'/>
      <source bridge='br0'/>
      <target dev='vnet0'/>
      <alias name='net0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
    </interface>
    <serial type='pty'>
      <source path='/dev/pts/0'/>
      <target port='0'/>
      <alias name='serial0'/>
    </serial>
    <console type='pty' tty='/dev/pts/0'>
      <source path='/dev/pts/0'/>
      <target type='serial' port='0'/>
      <alias name='serial0'/>
    </console>
    <input type='mouse' bus='ps2'/>
    <graphics type='vnc' port='6900' autoport='no' listen='0.0.0.0'/>
    <video>
      <model type='cirrus' vram='9216' heads='1'/>
      <alias name='video0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
    </video>
    <memballoon model='virtio'>
      <alias name='balloon0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/>
    </memballoon>
  </devices>
  <seclabel type='dynamic' model='apparmor'>
    <label>libvirt-70affd5d-af95-72c5-2d96-c131f46409b6</label>
    <imagelabel>libvirt-70affd5d-af95-72c5-2d96-c131f46409b6</imagelabel>
  </seclabel>
</domain>

Answer 1

这不起作用的原因是因为您尝试使用IDE体系结构将磁盘附加到正在运行的域.

想象一下,你有一个真正的物理服务器,你可以在它运行时打开它并插入IDE驱动器吗？不,架构不支持它.KVM/QEMU尝试模拟这种架构,然后必须呈现您所看到的错误:"磁盘总线'ide'不能热插拔."

一种解决方案是使用SCSI archicture连接磁盘.SCSI支持热插拔.您将使用的命令是:

virsh attach-disk --driver文件vm2 disk2.qcow2 sdc

唯一的变化是"sdc"而不是"hdc".这向KVM/QEMU暗示您需要SCSI而不是IDE,并且它将附加磁盘.

此外,当域停止时,您不能使用attach-disk,因为此功能用于运行域.