xen discuss - Oct 2009 - Why this error? ( xend.err "Error creating domain: Disk isn''t accessible")

I am attempting to start a new domU using this command as root: virsh create
<xml_file>

I am seeing the following error:

libvir: Xen Daemon error : POST operation failed: (xend.err "Error creating
domain: Disk isn''t
accessible")
error: Failed to create domain from /root/xvmfiles/abc-1.0.xml

The XML file looks like this:

<?xml version="1.0" encoding="UTF-8"?><domain
type="xen">
     <name>abc-1.0</name>
     <uuid>46606550-882c-42ff-9911-15c9a89185db</uuid>
     <bootloader>/usr/lib/xen/bin/pygrub</bootloader>
     <os>
         <type>linux</type>
     </os>
     <memory>12582912</memory>
     <vcpu>1</vcpu>
     <on_poweroff>destroy</on_poweroff>
     <on_reboot>restart</on_reboot>
     <on_crash>restart</on_crash>
     <distro name="solaris"/>
     <clock offset="localtime"/>
     <devices>
         <interface type="bridge">
             <source bridge="e1000g0"/>
             <target dev="vif-1.0"/>
             <mac address="00:16:3e:00:01:44"/>
         </interface>
         <disk device="disk" type="file">
             <driver name="tap" type="vdisk"/>
             <source file="/root/xvmfiles/abc-1.0"/>
             <target dev="xvda"/>
         </disk>
     </devices>
</domain>

I have vdisk files for the domU (vdisk.vmdk and vdisk.xml) in the directory
/root/xvmfiles/abc-1.0,
and these files have 755 permissions.  I am doing this on a Solaris system,
here''s the output from
uname -a:

SunOS lm1-dom0 5.11 snv_111a i86pc i386 i86xpv


Can anyone comment as to what my error may be?  Thanks in advance for your help.

--James

James Adams wrote:
> I am attempting to start a new domU using this command as root: virsh 
> create <xml_file>
> 
> I am seeing the following error:
> 
> libvir: Xen Daemon error : POST operation failed: (xend.err "Error 
> creating domain: Disk isn''t accessible")
> error: Failed to create domain from /root/xvmfiles/abc-1.0.xml
> 
> The XML file looks like this:
> 
> <?xml version="1.0" encoding="UTF-8"?><domain
type="xen">
>     <name>abc-1.0</name>
>     <uuid>46606550-882c-42ff-9911-15c9a89185db</uuid>
>     <bootloader>/usr/lib/xen/bin/pygrub</bootloader>
>     <os>
>         <type>linux</type>
>     </os>
>     <memory>12582912</memory>
>     <vcpu>1</vcpu>
>     <on_poweroff>destroy</on_poweroff>
>     <on_reboot>restart</on_reboot>
>     <on_crash>restart</on_crash>
>     <distro name="solaris"/>
>     <clock offset="localtime"/>
>     <devices>
>         <interface type="bridge">
>             <source bridge="e1000g0"/>
>             <target dev="vif-1.0"/>
>             <mac address="00:16:3e:00:01:44"/>
>         </interface>
>         <disk device="disk" type="file">
>             <driver name="tap" type="vdisk"/>
>             <source file="/root/xvmfiles/abc-1.0"/>
>             <target dev="xvda"/>
>         </disk>
>     </devices>
> </domain>
> 
> I have vdisk files for the domU (vdisk.vmdk and vdisk.xml) in the 
> directory /root/xvmfiles/abc-1.0, and these files have 755 permissions.  
> I am doing this on a Solaris system, here''s the output from uname
-a:
> 
> SunOS lm1-dom0 5.11 snv_111a i86pc i386 i86xpv
> 
> 
> Can anyone comment as to what my error may be?  Thanks in advance for 
> your help.

/root/xmvfiles should have r/w privs for user xvm... Do you
have that?



MRJ

On Fri, Oct 09, 2009 at 09:54:40AM -0600, James Adams wrote:
> I am seeing the following error:
> 
> libvir: Xen Daemon error : POST operation failed: (xend.err "Error
creating
> domain: Disk isn''t accessible")
> error: Failed to create domain from /root/xvmfiles/abc-1.0.xml
Look at /var/log/xen/xpvd-event.log

regards
john

Mark Johnson wrote:
> 
> 
> James Adams wrote:
>> I am attempting to start a new domU using this command as root: virsh 
>> create <xml_file>
>>
>> I am seeing the following error:
>>
>> libvir: Xen Daemon error : POST operation failed: (xend.err "Error
>> creating domain: Disk isn''t accessible")
>> error: Failed to create domain from /root/xvmfiles/abc-1.0.xml
>>
>> The XML file looks like this:
>>
>> <?xml version="1.0"
encoding="UTF-8"?><domain type="xen">
>>     <name>abc-1.0</name>
>>     <uuid>46606550-882c-42ff-9911-15c9a89185db</uuid>
>>     <bootloader>/usr/lib/xen/bin/pygrub</bootloader>
>>     <os>
>>         <type>linux</type>
>>     </os>
>>     <memory>12582912</memory>
>>     <vcpu>1</vcpu>
>>     <on_poweroff>destroy</on_poweroff>
>>     <on_reboot>restart</on_reboot>
>>     <on_crash>restart</on_crash>
>>     <distro name="solaris"/>
>>     <clock offset="localtime"/>
>>     <devices>
>>         <interface type="bridge">
>>             <source bridge="e1000g0"/>
>>             <target dev="vif-1.0"/>
>>             <mac address="00:16:3e:00:01:44"/>
>>         </interface>
>>         <disk device="disk" type="file">
>>             <driver name="tap" type="vdisk"/>
>>             <source file="/root/xvmfiles/abc-1.0"/>
>>             <target dev="xvda"/>
>>         </disk>
>>     </devices>
>> </domain>
>>
>> I have vdisk files for the domU (vdisk.vmdk and vdisk.xml) in the 
>> directory /root/xvmfiles/abc-1.0, and these files have 755 
>> permissions.  I am doing this on a Solaris system, here''s the
output
>> from uname -a:
>>
>> SunOS lm1-dom0 5.11 snv_111a i86pc i386 i86xpv
>>
>>
>> Can anyone comment as to what my error may be?  Thanks in advance for 
>> your help.
> 
> 
> /root/xmvfiles should have r/w privs for user xvm... Do you
> have that?
> 
> 
Thanks, Mark.

I changed the permissions on that directory to 777 and reran the command, same
error.

--James

John Levon wrote:
> On Fri, Oct 09, 2009 at 09:54:40AM -0600, James Adams wrote:
> 
>> I am seeing the following error:
>>
>> libvir: Xen Daemon error : POST operation failed: (xend.err "Error
creating
>> domain: Disk isn''t accessible")
>> error: Failed to create domain from /root/xvmfiles/abc-1.0.xml
> 
> Look at /var/log/xen/xpvd-event.log
> 
Thanks, John.  Interestingly enough there are no entries in that log file
whatsoever.  Is this
normal, or indicative of another problem?

--James

On Fri, Oct 09, 2009 at 10:26:18AM -0600, James Adams wrote:
> >>libvir: Xen Daemon error : POST operation failed: (xend.err
"Error
> >>creating domain: Disk isn''t accessible")
> >>error: Failed to create domain from /root/xvmfiles/abc-1.0.xml
> >
> >Look at /var/log/xen/xpvd-event.log
> 
> Thanks, John.  Interestingly enough there are no entries in that log file 
> whatsoever.  Is this normal, or indicative of another problem?
Yes, this is a serious problem. What''s the output of syseventadm list?

regards
john

I have worked out a solution to this problem, although it''s not clear
why the solution works.

I moved the vdisk files and domU XML file to another directory and now the domU
comes up with no
error.  I imagine that the problem is with the permissions on the original
directory, or more likely
one of its parent directories since the original directory had its permissions
set to 777 and still
the error persisted.

Can anyone point me to documentation which explains the directory permissions
requirements, so I can
learn enough about this to avoid this error in the future?

--James


James Adams wrote:
> I am attempting to start a new domU using this command as root: virsh 
> create <xml_file>
> 
> I am seeing the following error:
> 
> libvir: Xen Daemon error : POST operation failed: (xend.err "Error 
> creating domain: Disk isn''t accessible")
> error: Failed to create domain from /root/xvmfiles/abc-1.0.xml
> 
> The XML file looks like this:
> 
> <?xml version="1.0" encoding="UTF-8"?><domain
type="xen">
>     <name>abc-1.0</name>
>     <uuid>46606550-882c-42ff-9911-15c9a89185db</uuid>
>     <bootloader>/usr/lib/xen/bin/pygrub</bootloader>
>     <os>
>         <type>linux</type>
>     </os>
>     <memory>12582912</memory>
>     <vcpu>1</vcpu>
>     <on_poweroff>destroy</on_poweroff>
>     <on_reboot>restart</on_reboot>
>     <on_crash>restart</on_crash>
>     <distro name="solaris"/>
>     <clock offset="localtime"/>
>     <devices>
>         <interface type="bridge">
>             <source bridge="e1000g0"/>
>             <target dev="vif-1.0"/>
>             <mac address="00:16:3e:00:01:44"/>
>         </interface>
>         <disk device="disk" type="file">
>             <driver name="tap" type="vdisk"/>
>             <source file="/root/xvmfiles/abc-1.0"/>
>             <target dev="xvda"/>
>         </disk>
>     </devices>
> </domain>
> 
> I have vdisk files for the domU (vdisk.vmdk and vdisk.xml) in the 
> directory /root/xvmfiles/abc-1.0, and these files have 755 permissions.  
> I am doing this on a Solaris system, here''s the output from uname
-a:
> 
> SunOS lm1-dom0 5.11 snv_111a i86pc i386 i86xpv
> 
> 
> Can anyone comment as to what my error may be?  Thanks in advance for 
> your help.
> 
> --James
>