Open Stack

> We are in an even worst situation: we have flavors with 256GB of ram
> but only 100GB on the local hard disk, which means that we cannot
> snapshot VMs with this flavor.
>
> If there is any way to avoid saving the content of the ram to disk (or
> maybe there is a way to snapshot the ram to, e.g., ceph), we would be
> very happy.

Hello Antonio,

I received a new feedback in the Openstack patch review
(https://review.openstack.org/#/c/295865/) pointing me to this:

https://github.com/openstack/nova/blob/82a684fb1ae1dd1bd49e2a8792a2456b4d3ab037/nova/conf/workarounds.py#L72

so it looks like live snapshots are disabled because of an old buggy
libvirt. So actually this process of dumping all the RAM to disk is
not a bad design, but it is a necessary workaround because of libvirt
not being stable. It makes sense now.

At the moment I am running libvirt version 1.2.12-0ubuntu14.4~cloud0.
Maybe I can disable the workaround and try to do faster snapshots ?

Any other operator has feedback about this ?

Thank you

Saverio