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Hi Swapnil,

                I had tried it before , it is returning a string "volume"
followed by volume id

Thanks
Dinakar


On Wed, Oct 16, 2013 at 10:31 AM, Swapnil Kulkarni <
swapnilkulkarni2608 at gmail.com> wrote:

> Hi DInakar,
>
> Please use volume_name, volume_size,etc. These are volume related
> parameters frequently used in snapshots. You can always do *dir* to get
> any specific values you need.
>
> Best Regards,
> Swapnil
>
>
> On Wed, Oct 16, 2013 at 10:11 AM, Dinakar Gorti Maruti <
> dinakar.gm at cloudbyte.co> wrote:
>
>> hi,
>>    I am implementing a driver for cinder services and I am stuck with a
>> problem in creation of snapshot , I have a need to fetch the volume details
>> in snapshot creation.
>> I am using Openstack-Grizzly
>>
>> I am trying to use this line of code
>>
>> def create_snapshot(self, snapshot_ref):
>>       ..........
>>
>>       volume = snapshot_ref['volume']
>>
>>       ...........
>>
>>
>> Error :
>>
>> Traceback (most recent call last):
>>   File
>> "/usr/lib/python2.6/site-packages/cinder/openstack/common/rpc/amqp.py",
>> line 430, in _process_data
>>     rval = self.proxy.dispatch(ctxt, version, method, **args)
>>   File
>> "/usr/lib/python2.6/site-packages/cinder/openstack/common/rpc/dispatcher.py",
>> line 133, in dispatch
>>     return getattr(proxyobj, method)(ctxt, **kwargs)
>>   File "/usr/lib/python2.6/site-packages/cinder/volume/manager.py", line
>> 564, in create_snapshot
>>     {'status': 'error'})
>>   File "/usr/lib64/python2.6/contextlib.py", line 23, in __exit__
>>     self.gen.next()
>>   File "/usr/lib/python2.6/site-packages/cinder/volume/manager.py", line
>> 554, in create_snapshot
>>     model_update = self.driver.create_snapshot(snapshot_ref,volume_name)
>>   File
>> "/usr/lib/python2.6/site-packages/cinder/volume/drivers/cloudbyte.py", line
>> 195, in create_snapshot
>>     LOG.debug(_("phani volume object in snapshot :
>> %s"),snapshot_ref['volume'])
>>   File "/usr/lib/python2.6/site-packages/cinder/db/sqlalchemy/models.py",
>> line 74, in __getitem__
>>     return getattr(self, key)
>>   File
>> "/usr/lib64/python2.6/site-packages/SQLAlchemy-0.7.8-py2.6-linux-x86_64.egg/sqlalchemy/orm/attributes.py",
>> line 168, in __get__
>>     return self.impl.get(instance_state(instance),dict_)
>>   File
>> "/usr/lib64/python2.6/site-packages/SQLAlchemy-0.7.8-py2.6-linux-x86_64.egg/sqlalchemy/orm/attributes.py",
>> line 453, in get
>>     value = self.callable_(state, passive)
>>   File
>> "/usr/lib64/python2.6/site-packages/SQLAlchemy-0.7.8-py2.6-linux-x86_64.egg/sqlalchemy/orm/strategies.py",
>> line 481, in _load_for_state
>>     (mapperutil.state_str(state), self.key)
>>
>>
>>  DetachedInstanceError: Parent instance <Snapshot at 0x30a0cd0> is not
>> bound to a Session; lazy load operation of attribute 'volume' cannot proceed
>>
>> hoping for a solution
>>
>> Thanks
>> Dinakar
>>
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>>
>
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