Start A Xen Server VM that Gives "VDI Not Available"

Recently,Xenserver was working abnormally.
During the reboot, the following messages are displayed and
Cold reboot was necessary.  After the cold reboot, some VMs are not started normally.

 File "/opt/xensource/sm/resetvdis.py", line 155, in ?
    reset_vdi(session, vdi_uuid, force)
  File "/opt/xensource/sm/resetvdis.py", line 56, in reset_vdi
    vdi_ref = session.xenapi.VDI.get_by_uuid(vdi_uuid)
  File "/usr/lib/python2.4/site-packages/XenAPI.py", line 245, in __call__
    return self.__send(self.__name, args)
  File "/usr/lib/python2.4/site-packages/XenAPI.py", line 149, in xenapi_request
    result = _parse_result(getattr(self, methodname)(*full_params))
  File "/usr/lib/python2.4/site-packages/XenAPI.py", line 219, in _parse_result
    raise Failure(result['ErrorDescription'])
XenAPI.Failure: ['UUID_INVALID', 'VDI', '--force']



Furthermore, we also received the following error message when we tried to boot the server from the Xev Servers host's console:

[root@xenserver-102-90 log]# xe vm-start vm=vm-name
Error code: SR_BACKEND_FAILURE_46
Error parameters: , The VDI is not available [opterr=VDI 29ee8765-5556-42e1-a53e-362435f03d38 locked], 

 

To fix this issue , I followed the steps listed below   

1.

[root@]# xe vdi-forget uuid=29ee8765-5556-42e1-a53e-362435f03d38
2.
[root@}# xe vdi-list uuid=29ee8765-5556-42e1-a53e-362435f03d38
uuid ( RO)                : 29ee8765-5556-42e1-a53e-362435f03d38
          name-label ( RW): name
    name-description ( RW): name
             sr-uuid ( RO): dc7d9c04-bc32-cf68-d0c9-954a32257c55
        virtual-size ( RO): 322223484
            sharable ( RO): false
           read-only ( RO): false
3.
[root@]# xe vdi-param-set uuid=29ee8765-5556-42e1-a53e-362435f03d38 name-label=new-name
4.
[root@]# xe vdi-list uuid=29ee8765-5556-42e1-a53e-362435f03d38
uuid ( RO)                : 29ee8765-5556-42e1-a53e-362435f03d38
          name-label ( RW): new-name
    name-description ( RW): new-name
             sr-uuid ( RO): dc7d9c04-bc32-cf68-d0c9-954a32257c55
        virtual-size ( RO): 322122547200
            sharable ( RO): false
           read-only ( RO): false
5. On the VMs storage tab, select “Attach” and proceed to select the VDI on the SR.