Open Stack

Deleting a volume created from a snapshot is permitted.  Performing
operations on a volume created from snapshot should have the same behavior
as volumes created from volumes, images, or empty (no source).  In all of
these cases, the volume should be deleted, regardless of where it came
from.  Independence from source is one of the differences between volumes
and snapshots in Cinder.  The driver must take care to ensure this.

As to your question about propagating errors without changing an object's
state, that is unfortunately not doable in Cinder today (or any other
OpenStack project as far as I know).  The object's state is currently the
only mechanism for reporting an operation's success or failure.

On Sun, Mar 1, 2015 at 6:07 PM, Duncan Thomas <duncan.thomas at gmail.com>
wrote:

> I thought that case should be caught well before it gets to the driver.
> Can you retry with the LVM driver please?
>
> On 27 February 2015 at 10:48, Eduard Matei <eduard.matei at cloudfounders.com
> > wrote:
>
>> Hi,
>>
>> We've been testing our cinder driver extensively and found a strange
>> behavior in the UI:
>> - when trying to delete a snapshot that has clones (created volume from
>> snapshot) and error is raised in our driver which turns into
>> "error_deleting" in cinder and the UI; further actions on that snapshot are
>> impossible from the ui, the user has to go to CLI and do cinder
>> snapshot-reset-state to be able to delete it (after having deleted the
>> clones)
>> - to help with that we implemented a check in the driver and now we raise
>> exception.SnapshotIsBusy; now the snapshot remains available (as it should
>> be) but no error "bubble" is shown in the UI (only the green one: Success.
>> Scheduled deleting of...). So the user has to go to c-vol screen and check
>> the cause of the error
>>
>> So question: how should we handle this so that
>> a. The snapshot remains in state "available"
>> b. An error bubble is shown in the UI stating the cause.
>>
>> Thanks,
>> Eduard
>>
>> --
>>
>> *Eduard Biceri Matei, Senior Software Developer*
>> www.cloudfounders.com
>>  | eduard.matei at cloudfounders.com
>>
>>
>>
>> *CloudFounders, The Private Cloud Software Company*
>>
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>
>
> --
> Duncan Thomas
>
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-- 
*Avishay Traeger*
*Storage R&D*

Mobile: +972 54 447 1475
E-mail: avishay at stratoscale.com



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