OPS Notes By 枯木

OpenNebula KVM磁盘热插拔

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KVM支持以下两种磁盘类型的热插拔：

  • sd: SCSI (default).
  • vd: virtio.

KVM虚拟机需要开启acpi才支持磁盘的热插拔，使用OpenNebula安装虚拟机的时候需要设置如下选项：

  • FEATURES = [ acpi=”yes” ]

virtio磁盘热插拔

虚拟机加载acpiphp驱动

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# modprobe acpiphp   # 加载驱动
# fdisk -l

Disk /dev/vda: 32.2 GB, 32212254720 bytes
255 heads, 63 sectors/track, 3916 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/vda1   *           1          13      104391   83  Linux
/dev/vda2              14        3916    31350847+  8e  Linux LVM

选择需要添加磁盘的虚拟机- [ Disks & Hotplugging ] ，配置完成之后选择 Attach 挂载使用

Device Prefix选择sd表示scsi磁盘，如果是vd则是vitio类型磁盘。选择Attach之后，刷新页面就会看到新建的磁盘。

此时查看vda磁盘是否生效

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# fdisk -l           # 查看磁盘识别

...

Disk /dev/vdb: 1048 MB, 1048576000 bytes
16 heads, 63 sectors/track, 2031 cylinders
Units = cylinders of 1008 * 512 = 516096 bytes

Disk /dev/vdb doesn't contain a valid partition table

scsi磁盘热插拔

虚拟机加载acpiphp驱动

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# modprobe acpiphp   # 加载驱动

选择需要添加磁盘的虚拟机- [ Disks & Hotplugging ] ，配置完成之后选择 Attach挂载使用

如下即可看到新添加的磁盘

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# fdisk -l

...

Disk /dev/sda: 1048 MB, 1048576000 bytes
33 heads, 61 sectors/track, 1017 cylinders
Units = cylinders of 2013 * 512 = 1030656 bytes

Disk /dev/sda doesn't contain a valid partition table

如果未识别scsi磁盘，执行如下命令，使得KVM虚拟机识别

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# echo '- - -' > /sys/class/scsi_host/host0/scan
# fdisk -l
...
Disk /dev/sdb: 1048 MB, 1048576000 bytes
33 heads, 61 sectors/track, 1017 cylinders
Units = cylinders of 2013 * 512 = 1030656 bytes

Disk /dev/sdb doesn't contain a valid partition table

参考文档

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