[root@cache01 ~]# df -hT
Filesystem Type Size Used Avail Use% Mounted on
/dev/mapper/VolGroup-lv_root
ext4 8.3G 937M 7.0G 12% /
tmpfs tmpfs 119M 0 119M 0% /dev/shm
/dev/vda1 ext4 477M 33M 419M 8% /boot
[root@cache01 ~]#
生成一块新的硬盘
[root@bass virhost]# qemu-img create -f raw o5cache.add.disk.raw 2G
Formatting '05cache.add.disk.raw', fmt=raw size=2147483648
<disk type='file' device='disk'>
<driver name='qemu' type='raw' cache='none'/>
<source file='/home/virhost/05cache.add.disk.raw'/>
<target dev='vda' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x0'/>
</disk>
[root@bass virhost]# virsh start 05cache
Domain 05cache started
[root@bass virhost]# virsh attach-disk 05cache /home/virhost/05cache.add.disk.raw vdb --cache none
Disk attached successfully
virsh edit 05cache---------------->
<disk type='file' device='disk'>
<driver name='qemu' type='raw' cache='none'/>
<source file='/home/virhost/05cache.img'/>
<target dev='vda' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/>
</disk>
<disk type='block' device='cdrom'>
<driver name='qemu' type='raw'/>
<target dev='hdc' bus='ide'/>
<readonly/>
<address type='drive' controller='0' bus='1' target='0' unit='0'/>
</disk>
[root@cache01 ~]# fdisk -l
Disk /dev/vda: 10.7 GB, 10737418240 bytes
16 heads, 63 sectors/track, 20805 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: 0x000c1fb8
Device Boot Start End Blocks Id System
/dev/vda1 * 3 1018 512000 83 Linux
Partition 1 does not end on cylinder boundary.
/dev/vda2 1018 20806 9972736 8e Linux LVM
Partition 2 does not end on cylinder boundary.
Disk /dev/vdb: 2147 MB, 2147483648 bytes #挂上的新的硬盘
16 heads, 63 sectors/track, 4161 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: 0x00000000
Disk /dev/mapper/VolGroup-lv_root: 9168 MB, 9168748544 bytes
255 heads, 63 sectors/track, 1114 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
Disk /dev/mapper/VolGroup-lv_swap: 1040 MB, 1040187392 bytes
255 heads, 63 sectors/track, 126 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
[root@cache01 ~]# df -hT
Filesystem 
