[openstack-dev] [nova][cinder] non-persistent storage(after stopping VM, data will be rollback automatically), do you think we shoud introduce this feature?

Joe Gordon joe.gordon0 at gmail.com
Tue Mar 4 03:25:50 UTC 2014

On Mon, Mar 3, 2014 at 6:00 PM, Yuzhou (C) <vitas.yuzhou at huawei.com> wrote:
> Hi stackers,
> As far as I know ,there are two types of storage used by VM in openstack: Ephemeral Storage and Persistent Storage.
> Data on ephemeral storage ceases to exist when the instance it is associated with is terminated. Rebooting the VM or restarting the host server, however, will not destroy ephemeral data.
> Persistent storage means that the storage resource outlives any other resource and is always available, regardless of the state of a running instance.
> There is a use case that maybe need a new type of storage, maybe we can call it non-persistent storage .
> The use case is that VMs are assigned to the public ephemerally in public areas.
> After the VM is used, new data on storage of VM ceases to exist when the instance it is associated with is stopped.
> It means stop the VM, Non-persistent storage used by VM will be rollback automatically.
> Is there any other suggestions? Or any BPs about this use case?

This sounds like ephemeral storage plus snapshots.  You build a base
image, snapshot it then boot from the snapshot.

> Thanks!
> Zhou Yu
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