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[Openstack] [PackStack][Cinder] On which node OpenStack store data of each instance


I took the liberty to add the openstack distribution list back in.

Your description is a bit vague. Do you have dedicated nodes for 
storage, or do you run instances on the same nodes where storage is 
configured? Do you want run use volumes for instance storage, or 
ephemeral disks?

Volumes are normally located on remote servers or disk arrays, so that 
the answer is yes in this case. You can even pool storage of several 
nodes together using DRBD or (up to Newton) GlusterFS, but I have no 
experience in this area and can't tell you what would work and what 
would not.

To configure volume backends, see 

Ephemeral storage is normally local storage on the compute node where 
the instance runs. You can also use NFS-mounted remote filesystem for 
ephemeral storage.


On 11/13/2018 5:37 PM, Soheil Pourbafrani wrote:
> Thanks all,
> Suppose we use HDD disks of local machines and there are no shared 
> storages like SAN storage. So in such an environment is it possible to 
> use remote disks on other machines for compute nodes? (I think it's 
> impossible with HDD local disks and for such a scenario we should have 
> SAN storage).
> So the question is is it possible to have volumes in local disk of 
> compute nodes? or we should let OpenStack go!
> On Mon, Nov 12, 2018 at 6:31 PM Bernd Bausch <berndbausch at gmail.com 
> <mailto:berndbausch at gmail.com>> wrote:
>     OpenStack stores volumes wherever you configure it to store them.
>     On a
>     disk array, an NFS server, a Ceph cluster, a dedicated storage
>     node, a
>     controller or even a compute node. And more.
>     My guess: Volumes on controllers or compute nodes are not a good
>     solution for production systems.
>     By default, Packstack implements Cinder volumes as LVM volumes on the
>     controller. It's probably possible to put the LVM volumes on other
>     nodes, and it is definitely possible to configure a different backend
>     than LVM, for example Netapp, in which case the volumes would be on a
>     Netapp appliance.
>     On 11/12/2018 9:34 PM, Soheil Pourbafrani wrote:
>     > My question is does OpenStack store volumes somewhere other than
>     > the compute node?
>     > For example in PackStack on two nodes, one for controller and
>     network
>     > and the other for compute node, the instance's volumes will be
>     stored
>     > on the controller or on compute?
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