Open Stack

+1
"it would be nice for cinder to have a concept of a read-only volume that
could be attached to multiple instances"

On Tue, Dec 11, 2012 at 1:00 PM, Vishvananda Ishaya
<vishvananda at gmail.com>wrote:

> Ultimately it would be nice for cinder to have a concept of a read-only
> volume that could be attached to multiple instances, but in this case I
> think it is a bug. The whole point of reserving the volume in cinder is so
> that this cannot happen. Reserving should be atomic and cinder should
> reject the reserve if it is already reserved.
>
> Vish
>
> On Dec 11, 2012, at 11:19 AM, "Karajgi, Rohit" <Rohit.Karajgi at nttdata.com>
> wrote:
>
> Hi,****
> ** **
> I would like to get opinions on whether we should allow multiple instances
> to be booted from a single volume.****
> ** **
> This is incorrectly allowed currently, the same volume seems to get
> attached to each instance and the instances boot to Active status.****
> More details can be seen in description of the bug
> https://bugs.launchpad.net/nova/+bug/1087253.****
> ** **
> Ideally, the best way to achieve this would be pass a list of block device
> mappings equal to the number of instances requested,****
> changes going in to the Nova API code.****
> Is it more feasible to restrict more than one instance to be passed with a
> single block device mapping, or accept a list of BDMs?****
> ** **
> Regards,****
> Rohit****
> ** **
>
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