Re: reports of xend not starting

[Jim Fehlig <jfehlig@novell.com>]

Masaki Kanno wrote:
> Thu, 04 Mar 2010 12:03:17 -0700, Jim Fehlig wrote:
>
>   
>> Hi Kan,
>>
>> I've received several reports of xend not starting with the following
>> traceback
>>
>> [2010-03-04 13:24:10 9096] ERROR (SrvDaemon:349) Exception starting xend (
>> '044dde78-2896-cb88-2ada-3c03a73c35c1')
>> Traceback (most recent call last):
>>  File "/usr/lib64/python2.6/site-packages/xen/xend/server/SrvDaemon.py", 
>> line 341, in run
>>    servers = SrvServer.create()
>>  File "/usr/lib64/python2.6/site-packages/xen/xend/server/SrvServer.py", 
>> line 261, in create
>>    root.putChild('xend', SrvRoot())
>>  File "/usr/lib64/python2.6/site-packages/xen/xend/server/SrvRoot.py", 
>> line 40, in __init__
>>    self.get(name)
>>  File "/usr/lib64/python2.6/site-packages/xen/web/SrvDir.py", line 84, in 
>> get
>>    val = val.getobj()
>>  File "/usr/lib64/python2.6/site-packages/xen/web/SrvDir.py", line 52, in 
>> getobj
>>    self.obj = klassobj()
>>  File "/usr/lib64/python2.6/site-packages/xen/xend/server/SrvNode.py", 
>> line 30, in __init__
>>    self.xn = XendNode.instance()
>>  File "/usr/lib64/python2.6/site-packages/xen/xend/XendNode.py", line 1187
>> , in instance
>>    inst = XendNode()
>>  File "/usr/lib64/python2.6/site-packages/xen/xend/XendNode.py", line 161,
>> in __init__
>>    self._init_PSCSIs()
>>  File "/usr/lib64/python2.6/site-packages/xen/xend/XendNode.py", line 339,
>> in _init_PSCSIs
>>    saved_HBA_uuid = saved_pscsis[pscsi_uuid].get('HBA', None)
>> KeyError: '044dde78-2896-cb88-2ada-3c03a73c35c1'
>>
>>
>> All reported cases involve fresh installs of dom0, so
>> /var/lib/xend/state/ is empty.  I wasn't able to reproduce the issue
>> myself but a reporter was kind enough to try a debug patch. I found that
>> vscsi_util.get_all_scsi_devices() returns several records containing
>> same scsi_id.  With /var/lib/xend/state/pscsi.xml non-existent and
>> identical scsi_id, we access an element of saved_pscsis that does not
>> exist.  In fact, the list is empty.
>>
>> The attached patch catches the exception and allows xend to start but
>> I'm not sure if this breaks other parts of the code.  It looks safe to
>> me but would like your review.
>>
>>     
>
> Hi Jim,
>
> Thanks for your report and patch.
>
> Are your SCSI devices multi-path configuration?
>   

Yes, it appears all of the reports have multipath configured.

> If so, the configuration isn't supported by pvSCSI of XenAPI yet.
>
> I added a small fix to your patch.  Could you send your Signed-off-by 
> line?
>   

Ok, thanks for the review and changes.

Cheers,
Jim

Signed-off-by: Jim Fehlig<jfehlig@novell.com>


> Signed-off-by: Masaki Kanno <kanno.masaki@jp.fujitsu.com>
>
> Best regards,
>  Kan
>
>