[Openstack] [openstack][qemu][disk cache]cache=writethrough guarantee data security ?

2017-06-19 Thread 文峰sx-9149
Hi All!I have recently been troubled by qemu's disk cache, I learned from here  the difference between them.And I think that writethrough should be able to  guarantee that the virtual machine will not have data loss in the case of a  host power outage.But my test results show that writethrough does

[Openstack] Floating IP issues in multiple cloud installs.

2017-06-19 Thread Ken D'Ambrosio
Hi, all. We've got two Canonical Newton installs using VLANs and we're having intermittent issues we simply can't figure out. (Note that a third installation using flat networks is not having this issue.) Floating IPs set up and work... sporadically. * Stateful connections (e.g., SSH) often

Re: [Openstack] Floating IP issues in multiple cloud installs.

2017-06-19 Thread Brian Haley
On 06/19/2017 08:51 AM, Ken D'Ambrosio wrote: Hi, all. We've got two Canonical Newton installs using VLANs and we're having intermittent issues we simply can't figure out. (Note that a third installation using flat networks is not having this issue.) Floating IPs set up and work... sporadical