Re: some questions about rbd

[Josh Durgin <josh.durgin@inktank.com>]

Currently there's no way to force deletion of a RADOS object that
has watchers. Clients with an rbd image open watch the header
object, hence the error you saw.

There's a feature request open for this at the RADOS level:
http://www.tracker.newdream.net/issues/2339

I'm curious about why you want to delete an image even
if a vm is still using it. What's the context in which this
becomes necessary?

Josh

On 10/22/2012 11:25 PM, Dan Mick wrote:
> I don't think we support that; I'm not sure how hard it would be.
> Somehow we'd have to keep knowledge of the open image handle around to
> fail further I/O requests, it seems.  Josh?
>
> On 10/22/2012 10:44 PM, jie sun wrote:
>> Yes. I want to delete the image by force, even the vm is still using it.
>>
>> 2012/10/23 Dan Mick <dan.mick@inktank.com>:
>>>
>>>
>>> On 10/22/2012 08:10 PM, jie sun wrote:
>>>>
>>>> Hi,
>>>>
>>>> I create a image and map it to a virtual machine,and then mkfs and
>>>> mount
>>>> it.
>>>>
>>>> I want to remove the image from mon server forcely, but it says
>>>> "Removing image: 99% complete...failed.
>>>>    delete error: image still has watchers
>>>>    This means the image is still open or the client using it crashed.
>>>> Try again after closing/unmapping it or waiting 30s for the crashed
>>>> client to timeout."
>>>>
>>>> I want to know is there any other way to remove it by force?
>>>
>>>
>>> Are you saying the vm still has the device open and is trying to use it?
>>> But even so, you want the image to be deleted?
>>>
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