KVM增加硬盘
创建磁盘： qemu-img create -f raw/data/kvm/test03_2.img 5G （原kvm为test03.img，增加一个硬盘test03_2.img）关闭虚拟机： virsh destroy test03
编辑配置文件： virsh edit test03增加如下：
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<disk type='file' device='disk'>
<driver name='qemu' type='raw' cache='none'/>
<source file='/data/kvm/test03_2.img'/>
<target dev='vdb' bus='virtio'/>
</disk>
开启虚拟机：virsh start test03
进入虚拟机：virsh console test03
分区： fdisk /dev/vdb
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Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel
Building a new DOS disklabel with disk identifier 0x137d4ff1.
Changes will remain in memory only, until you decide to write them.
After that, of course, the previous content won't be recoverable.
Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)
WARNING: DOS-compatible mode is deprecated. It's strongly recommended to
switch off the mode (command 'c') and change display units to
sectors (command 'u').
Command (m for help): p
Disk /dev/vdb: 5368 MB, 5368709120 bytes
16 heads, 63 sectors/track, 10402 cylinders
Units = cylinders of 1008 * 512 = 516096 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x137d4ff1
Device Boot Start End Blocks IdSystem
Command (m for help): n
Command action
e extended
p primary partition (1-4)
p
Partition number (1-4): 1
First cylinder (1-10402, default 1):
Using default value 1
Last cylinder, +cylinders or +size{K,M,G} (1-10402, default 10402):
Using default value 10402
Command (m for help): p
Disk /dev/vdb: 5368 MB, 5368709120 bytes
16 heads, 63 sectors/track, 10402 cylinders
Units = cylinders of 1008 * 512 = 516096 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x137d4ff1
Device Boot Start End Blocks IdSystem
/dev/vdb1 1 10402 5242576+83Linux
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
vdb: vdb1
Syncing disks.
格式化：mkfs.ext4 /dev/vdb1
挂载： mount /dev/vdb1 /mnt
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# df -h
Filesystem SizeUsed Avail Use% Mounted on
/dev/mapper/VolGroup-lv_root
28G762M 26G 3% /
tmpfs 250M 0250M 0% /dev/shm
/dev/vda1 477M 31M421M 7% /boot
/dev/vdb1 4.8G 10M4.6G 1% /mnt
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