Athafoud's questions

We are going to upgrade our OpenStack by adding a bunch of new compute nodes. These nodes sole purpose is to host 'tiny' instances for users to run some small-scale experiments or to test stuff. Those server specification just exceed the minimum requirements.

We want for some users to have only access to the 'fast cloud' and some to the 'slow one', is that possible?

We are considering to use either Regions or Zones (preferably) to 'separate' our cloud. We are searching if we can implement these restrictions through keystone. An alternative is to create host aggregates on which only some specific 'slow' or 'fast' flavors can run and then to assign these flavors to specific projects. According to the membership of each project the user will run her VMs in the 'fast' or the 'slow' cloud.

I have a Windows Server, in which the on-board SATA controller is broken and the machine can not identify any of the connected disks.

To overcome the issue I am thinking of buying PCI-E SATA Controller and connect all the available disk devices on it.

Will this controller be equivalent as the board controller. In short terms will I be able to boot without any issue my machine from a disk connected on the PCI-E controller? Do I need to re-install the OS (Windows Server) or it will work as is?

To avoid any confusion, the machine I am talking about is not a rackable server or a blade server, but is more or less a high-end 'desktop' machine that is used as a server.

Update 19.06.2015

I just installed the PCI-E SATA Controller and everything runs smoothly, no additional configurations of re-installations where needed.

Any attempt to start nova compute services fails with the error HypervisorUnavailable: Connection to the hypervisor is broken on host:

The trace log is the following (taken from /var/log/nova/nova-compute.log )

AUDIT nova.service [-] Starting compute node (version 2014.1.1)
ERROR nova.virt.libvirt.driver [-] Connection to libvirt failed: Failed to connect socket to '/var/run/libvirt/libvirt-sock': No such file or directory
TRACE nova.virt.libvirt.driver Traceback (most recent call last):
TRACE nova.virt.libvirt.driver   File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/driver.py", line 787, in _connect
TRACE nova.virt.libvirt.driver     libvirt.openAuth, uri, auth, flags)
TRACE nova.virt.libvirt.driver   File "/usr/lib/python2.7/dist-packages/eventlet/tpool.py", line 139, in proxy_call
TRACE nova.virt.libvirt.driver     rv = execute(f,*args,**kwargs)
TRACE nova.virt.libvirt.driver   File "/usr/lib/python2.7/dist-packages/eventlet/tpool.py", line 77, in tworker
TRACE nova.virt.libvirt.driver     rv = meth(*args,**kwargs)
TRACE nova.virt.libvirt.driver   File "/usr/lib/python2.7/dist-packages/libvirt.py", line 105, in openAuth
TRACE nova.virt.libvirt.driver     if ret is None:raise libvirtError('virConnectOpenAuth() failed')
TRACE nova.virt.libvirt.driver libvirtError: Failed to connect socket to '/var/run/libvirt/libvirt-sock': No such file or directory
TRACE nova.virt.libvirt.driver
ERROR nova.openstack.common.threadgroup [-] Connection to the hypervisor is broken on host: <HOST_NAME>
TRACE nova.openstack.common.threadgroup Traceback (most recent call last):
TRACE nova.openstack.common.threadgroup   File "/usr/lib/python2.7/dist-packages/nova/openstack/common/threadgroup.py", line 117, in wait
TRACE nova.openstack.common.threadgroup     x.wait()
TRACE nova.openstack.common.threadgroup   File "/usr/lib/python2.7/dist-packages/nova/openstack/common/threadgroup.py", line 49, in wait
TRACE nova.openstack.common.threadgroup     return self.thread.wait()
TRACE nova.openstack.common.threadgroup   File "/usr/lib/python2.7/dist-packages/eventlet/greenthread.py", line 168, in wait
TRACE nova.openstack.common.threadgroup     return self._exit_event.wait()
TRACE nova.openstack.common.threadgroup   File "/usr/lib/python2.7/dist-packages/eventlet/event.py", line 116, in wait
TRACE nova.openstack.common.threadgroup     return hubs.get_hub().switch()
TRACE nova.openstack.common.threadgroup   File "/usr/lib/python2.7/dist-packages/eventlet/hubs/hub.py", line 187, in switch
TRACE nova.openstack.common.threadgroup     return self.greenlet.switch()
TRACE nova.openstack.common.threadgroup   File "/usr/lib/python2.7/dist-packages/eventlet/greenthread.py", line 194, in main
TRACE nova.openstack.common.threadgroup     result = function(*args, **kwargs)
TRACE nova.openstack.common.threadgroup   File "/usr/lib/python2.7/dist-packages/nova/openstack/common/service.py", line 483, in run_service
TRACE nova.openstack.common.threadgroup     service.start()
TRACE nova.openstack.common.threadgroup   File "/usr/lib/python2.7/dist-packages/nova/service.py", line 163, in start
TRACE nova.openstack.common.threadgroup     self.manager.init_host()
TRACE nova.openstack.common.threadgroup   File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 1006, in init_host
TRACE nova.openstack.common.threadgroup     self.driver.init_host(host=self.host)
TRACE nova.openstack.common.threadgroup   File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/driver.py", line 656, in init_host
TRACE nova.openstack.common.threadgroup     self._do_quality_warnings()
TRACE nova.openstack.common.threadgroup   File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/driver.py", line 639, in _do_quality_warnings
 TRACE nova.openstack.common.threadgroup     caps = self.get_host_capabilities()
TRACE nova.openstack.common.threadgroup   File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/driver.py", line 2849, in get_host_capabilities
TRACE nova.openstack.common.threadgroup     xmlstr = self._conn.getCapabilities()
TRACE nova.openstack.common.threadgroup   File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/driver.py", line 721, in _get_connection
TRACE nova.openstack.common.threadgroup     wrapped_conn = self._get_new_connection()
TRACE nova.openstack.common.threadgroup   File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/driver.py", line 674, in _get_new_connection
TRACE nova.openstack.common.threadgroup     wrapped_conn = self._connect(self.uri(), self.read_only)
TRACE nova.openstack.common.threadgroup   File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/driver.py", line 796, in _connect
TRACE nova.openstack.common.threadgroup     raise exception.HypervisorUnavailable(host=CONF.host)
TRACE nova.openstack.common.threadgroup HypervisorUnavailable: Connection to the hypervisor is broken on host: <HOST_NAME>

No other log file indicates any error syslog, dmesg and /var/log/libvirt/libvirtd.log does not show any issue

The libvirt configuration (/etc/libvirt/libvirtd.conf) was set to log the errors log_outputs="3:syslog:libvirtd"

Before the error appear the node was running smoothly, no changes were made.