Xen devel - Jun 2010 - virsh blkstat doesn''t work on HVM

Hi 

 

I tried to use virsh blkstat to get information of a block, but it returns an
error message as shown below

This function works fine in KVM, but fail in XEN.

I tried XEN 3.4.3 ,4.0.0 and 4.0.1 with libvirt 0.7.1 from fedora yum server and
0.8.1 from libvirt .

All of them are fail to get the block status.

The following is the config file and error message of virsh domblkstat.

Any one knows how to make this function work?

 

[root@localhost ~]# virsh dumpxml vm1

<domain type=''xen'' id=''1''>

  <name>vm1</name>

  <uuid>12af1ed4-2f2d-f02d-9a2a-5d4f377889d5</uuid>

  <memory>524288</memory>

  <currentMemory>524288</currentMemory>

  <vcpu>1</vcpu>

  <os>

    <type>hvm</type>

    <loader>/usr/lib/xen/boot/hvmloader</loader>

    <boot dev=''hd''/>

  </os>

  <features>

    <acpi/>

    <apic/>

    <pae/>

  </features>

  <clock offset=''utc''/>

  <on_poweroff>destroy</on_poweroff>

  <on_reboot>restart</on_reboot>

  <on_crash>restart</on_crash>

  <devices>

    <emulator>/usr/lib64/xen/bin/qemu-dm</emulator>

    <disk type=''file'' device=''disk''>

      <driver name=''file''/>

      <source file=''/var/lib/libvirt/images/vm1.img''/>

      <target dev=''hda'' bus=''ide''/>

    </disk>

    <disk type=''file'' device=''cdrom''>

      <target dev=''hdc'' bus=''ide''/>

      <readonly/>

    </disk>

    <interface type=''bridge''>

      <mac address=''00:16:36:0f:fb:7a''/>

      <source bridge=''eth0''/>

      <script path=''/etc/xen/scripts/vif-bridge''/>

      <target dev=''vif1.0''/>

    </interface>

    <serial type=''pty''>

      <source path=''/dev/pts/0''/>

      <target port=''0''/>

    </serial>

    <console type=''pty''
tty=''/dev/pts/0''>

      <source path=''/dev/pts/0''/>

      <target port=''0''/>

    </console>

    <input type=''mouse'' bus=''ps2''/>

    <graphics type=''vnc'' port=''5900''
autoport=''yes'' keymap=''en-us''/>

    <sound model=''es1370''/>

  </devices>

</domain>

 

[root@localhost ~]# virsh domblkstat vm1 hda

error: Failed to get block stats vm1 hda

error: internal error read_bd_stats: Failed to read any block statistics

 


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You should ask libvirt-ML
http://libvirt.org/contact.html

By the way, I am looking around the the current code of libvirt.
you should check following data exist or not.

"/sys/devices/xen-backend/vbd-%d-%d/statistics/%s"
or
"/sys/devices/xen-backend/tap-%d-%d/statistics/%s"

see read_bd_stat from following
http://libvirt.org/git/?p=libvirt.git;a=blob;f=src/xen/block_stats.c

Thanks
Atsushi SAKAI


<wenche_chang@trend.com.tw> wrote:
> Hi 
> 
>  
> 
> I tried to use virsh blkstat to get information of a block, but it returns
an error message as shown below
> 
> This function works fine in KVM, but fail in XEN.
> 
> I tried XEN 3.4.3 ,4.0.0 and 4.0.1 with libvirt 0.7.1 from fedora yum
server and 0.8.1 from libvirt .
> 
> All of them are fail to get the block status.
> 
> The following is the config file and error message of virsh domblkstat.
> 
> Any one knows how to make this function work?
> 
>  
> 
> [root@localhost ~]# virsh dumpxml vm1
> 
> <domain type=''xen'' id=''1''>
> 
>   <name>vm1</name>
> 
>   <uuid>12af1ed4-2f2d-f02d-9a2a-5d4f377889d5</uuid>
> 
>   <memory>524288</memory>
> 
>   <currentMemory>524288</currentMemory>
> 
>   <vcpu>1</vcpu>
> 
>   <os>
> 
>     <type>hvm</type>
> 
>     <loader>/usr/lib/xen/boot/hvmloader</loader>
> 
>     <boot dev=''hd''/>
> 
>   </os>
> 
>   <features>
> 
>     <acpi/>
> 
>     <apic/>
> 
>     <pae/>
> 
>   </features>
> 
>   <clock offset=''utc''/>
> 
>   <on_poweroff>destroy</on_poweroff>
> 
>   <on_reboot>restart</on_reboot>
> 
>   <on_crash>restart</on_crash>
> 
>   <devices>
> 
>     <emulator>/usr/lib64/xen/bin/qemu-dm</emulator>
> 
>     <disk type=''file''
device=''disk''>
> 
>       <driver name=''file''/>
> 
>       <source
file=''/var/lib/libvirt/images/vm1.img''/>
> 
>       <target dev=''hda''
bus=''ide''/>
> 
>     </disk>
> 
>     <disk type=''file''
device=''cdrom''>
> 
>       <target dev=''hdc''
bus=''ide''/>
> 
>       <readonly/>
> 
>     </disk>
> 
>     <interface type=''bridge''>
> 
>       <mac address=''00:16:36:0f:fb:7a''/>
> 
>       <source bridge=''eth0''/>
> 
>       <script path=''/etc/xen/scripts/vif-bridge''/>
> 
>       <target dev=''vif1.0''/>
> 
>     </interface>
> 
>     <serial type=''pty''>
> 
>       <source path=''/dev/pts/0''/>
> 
>       <target port=''0''/>
> 
>     </serial>
> 
>     <console type=''pty''
tty=''/dev/pts/0''>
> 
>       <source path=''/dev/pts/0''/>
> 
>       <target port=''0''/>
> 
>     </console>
> 
>     <input type=''mouse''
bus=''ps2''/>
> 
>     <graphics type=''vnc'' port=''5900''
autoport=''yes'' keymap=''en-us''/>
> 
>     <sound model=''es1370''/>
> 
>   </devices>
> 
> </domain>
> 
>  
> 
> [root@localhost ~]# virsh domblkstat vm1 hda
> 
> error: Failed to get block stats vm1 hda
> 
> error: internal error read_bd_stats: Failed to read any block statistics
> 
>  
> 
> 
> TREND MICRO EMAIL NOTICE
> The information contained in this email and any attachments is confidential
and may be subject to copyright or other intellectual property protection. If
you are not the intended recipient, you are not authorized to use or disclose
this information, and we request that you notify us by reply mail or telephone
and delete the original message from your mail system.


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