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Thanks for your reply.
I'm referring this link
https://docs.openstack.org/mitaka/admin-guide/compute-images-instances.html
to understand about root disk. In this it is saying root disk will come
from compute node. What is the location of root disk on compute node?

If I want to keep all my vms on shared storage . How to configure it ?

Or If I want to keep all my vms on cinder volume. What will be the
configuration for it on nova and cinder?


On Thu, 11 Jul 2019, 15:24 Eugen Block, <eblock at nde.ag> wrote:

> Hi,
>
> it's always glance that serves the images, it just depends on how you
> decide to create the instance, ephemeral or persistent disks. You can
> find more information about storage concepts in [1].
>
> If I'm not completely wrong, since Newton release the default in the
> Horizon settings is to create an instance from volume, so it would be
> a persistent disk managed by cinder (the volume persists after the
> instance has been deleted, this is also configurable). The image is
> downloaded from glance into a volume on your volume server.
>
> If you change the Horizon behavior or if you launch an instance from
> the cli you'd get an ephemeral disk by nova, depending on your storage
> backend this would be a local copy of the image on the compute node(s)
> or something related in your storage backend, e.g. an rbd object in
> ceph.
>
> Does this clear it up a bit?
>
> Regards,
> Eugen
>
> [1]
>
> https://docs.openstack.org/arch-design/design-storage/design-storage-concepts.html
>
>
> Zitat von Jyoti Dahiwele <jyotishri403 at gmail.com>:
>
> > Dear Team,
> >
> > Please clear me my following doubts.
> > When I use image from source option  and mini flavor to create an
> instace,
> > from which storage pool instance will get root disk ? From cinder or
> glance?
>
>
>
>
>
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