我有虚拟机，并附加物理磁盘：
<pool type='disk'> <name>X</name> <uuid>0119698d-d28a-fbc8-6ca3-40c485957e49</uuid> <capacity>2000396321280</capacity> <allocation>2000388063744</allocation> <available>8225280</available> <source> <device path='/dev/sdb'> <freeExtent start='2000388096000' end='2000396321280'/> </device> <format type='dos'/> </source> <target> <path>/dev</path> <permissions> <mode>0700</mode> <owner>-1</owner> <group>-1</group> </permissions> </target> </pool> 我的虚拟机有1个核心和2GB的内存。 当我复制一个文件，我有7MB / s的传输速率。
<domain type='kvm' id='7'> <name>gfs-6</name> <uuid>4061a8b3-860b-3aaa-5014-36c3dbc15ca4</uuid> <memory>2097152</memory> <currentMemory>2097152</currentMemory> <vcpu>1</vcpu> <os> <type arch='x86_64' machine='pc-0.14'>hvm</type> <boot dev='hd'/> <bootmenu enable='no'/> </os> <features> <acpi/> <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='raw'/> <source file='/opt/vm/gfs-6.img'/> <target dev='vda' bus='virtio'/> <alias name='virtio-disk0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/> </disk> <disk type='block' device='disk'> <driver name='qemu' type='raw'/> <source dev='/dev/sdb1'/> <target dev='sda' bus='scsi'/> <alias name='scsi0-0-0'/> <address type='drive' controller='0' bus='0' unit='0'/> </disk> <controller type='ide' index='0'> <alias name='ide0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/> </controller> <controller type='scsi' index='0'> <alias name='scsi0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/> </controller> <interface type='bridge'> <mac address='52:54:00:2a:56:5e'/> <source bridge='br1'/> <target dev='vnet1'/> <model type='e1000'/> <alias name='net0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/> </interface> <serial type='pty'> <source path='/dev/pts/2'/> <target port='0'/> <alias name='serial0'/> </serial> <console type='pty' tty='/dev/pts/2'> <source path='/dev/pts/2'/> <target type='serial' port='0'/> <alias name='serial0'/> </console> <input type='mouse' bus='ps2'/> <graphics type='vnc' port='5901' autoport='yes'/> <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-4061a8b3-860b-3aaa-5014-36c3dbc15ca4</label> <imagelabel>libvirt-4061a8b3-860b-3aaa-5014-36c3dbc15ca4</imagelabel> </seclabel> </domain>
我做错了什么？ 我想在我的虚拟机上有更好的磁盘性能。
你应该使用virtio而不是scsi，这样会更快。
<target dev='sda' bus='scsi'/>
直接访问磁盘几乎肯定会提高性能。 这有时被称为“半虚拟化”，使用KVM时需要使用virtio驱动程序（注意，这也可以用于networking设备）。
详细信息可以在这里find： http : //wiki.libvirt.org/page/Virtio