Re: [Xen-devel] virsh blkstat doesn't work on HVM

[Atsushi SAKAI <sakaia@xxxxxxxxxxxxxx>]

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@xxxxxxxxxxxx> 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
> 
>  
> 
> 
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