thank you for your instant reply.
1. so far,we haven't used cache yet.
2. about the version:
qemu--QEMU emulator version 1.4.0 (Debian 1.4.0+dfsg-1expubuntu4)
ceph---ceph version 0.61.4
the xml file of the vm is as belows:
<domain type='kvm' id='4'>
<name>i-2-49-VM</name>
<uuid>126085aa-8b39-3a04-a9d4-737a4f82a8b4</uuid>
<description>CentOS 5.5 (64-bit)</description>
<memory unit='KiB'>1048576</memory>
<currentMemory unit='KiB'>1048576</currentMemory>
<vcpu placement='static'>1</vcpu>
<cputune>
<shares>1000</shares>
</cputune>
<os>
<type arch='x86_64' machine='pc-i440fx-1.4'>hvm</type>
<boot dev='cdrom'/>
<boot dev='hd'/>
</os>
<features>
<acpi/>
<apic/>
<pae/>
</features>
<clock offset='utc'/>
<on_poweroff>destroy</on_poweroff>
<on_reboot>restart</on_reboot>
<on_crash>destroy</on_crash>
<devices>
<emulator>/usr/bin/kvm-spice</emulator>
<disk type='network' device='disk'>
<driver name='qemu' type='raw' cache='none'/>
<auth username='admin'>
<secret type='ceph' uuid='17311be9-bd3c-33cd-aaa0-6b2fe27908e4'/>
</auth>
<source protocol='rbd'
name='cloudstack-2/4c6044a6-ab8c-4f6a-a33c-2a68be73ef6b'>
<host name='XXXXXXXXXX' port='6789'/>
</source>
<target dev='vda' bus='virtio'/>
<alias name='virtio-disk0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x04'
function='0x0'/>
</disk>
<disk type='network' device='disk'>
<driver name='qemu' type='raw' cache='none'/>
<auth username='admin'>
<secret type='ceph' uuid='17311be9-bd3c-33cd-aaa0-6b2fe27908e4'/>
</auth>
<source protocol='rbd'
name='cloudstack-2/9a818d53-de09-4347-9d87-7823697cc12b'>
<host name='XXXXXXXXXX' port='6789'/>
</source>
<target dev='vdb' bus='virtio'/>
<alias name='virtio-disk1'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x05'
function='0x0'/>
</disk>
<disk type='file' device='cdrom'>
<driver name='qemu' type='raw' cache='none'/>
<target dev='hdc' bus='ide'/>
<readonly/>
<alias name='ide0-1-0'/>
<address type='drive' controller='0' bus='1' target='0' unit='0'/>
</disk>
<controller type='usb' index='0'>
<alias name='usb0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x01'
function='0x2'/>
</controller>
<controller type='ide' index='0'>
<alias name='ide0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x01'
function='0x1'/>
</controller>
<interface type='bridge'>
<mac address='06:ff:28:00:00:0b'/>
<source bridge='cloudbr0'/>
<target dev='vnet9'/>
<model type='virtio'/>
<alias name='net0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x03'
function='0x0'/>
</interface>
<serial type='pty'>
<source path='/dev/pts/4'/>
<target port='0'/>
<alias name='serial0'/>
</serial>
<console type='pty' tty='/dev/pts/4'>
<source path='/dev/pts/4'/>
<target type='serial' port='0'/>
<alias name='serial0'/>
</console>
<input type='tablet' bus='usb'>
<alias name='input0'/>
</input>
<input type='mouse' bus='ps2'/>
<graphics type='vnc' port='5903' autoport='yes' listen='0.0.0.0'>
<listen type='address' address='0.0.0.0'/>
</graphics>
<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='0x06'
function='0x0'/>
</memballoon>
</devices>
<seclabel type='none'/>
</domain>
Best regards.
在 2013-06-28 15:54:07，"Alex Bligh" <[email protected]> 写道：
>
>On 28 Jun 2013, at 08:41, 华仔 wrote:
>
>> write speed: wget http://remote server ip/2GB.file , we get a write
>> speed at an average speed of 6MB/s.(far behind expected)
>> (we must get something wrong there, we would appreciate a lot if any help
>> comes from you. we think the problems comes from the kvm emulator, but we
>> are not sure, can you give us some advice to improve our vm's disk
>> performance in the aspect of writing speed?)
>
>Are you using cache=writeback on your kvm command line? What about librbd
>caching? What versions of kvm & ceph?
>
>--
>Alex Bligh
>
>
>
>
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