We started getting the following error in the "Agent BeforeHostUp phase" on 
a M3.medium instance a few days ago.  Running the same 
farm on a t2.medium does not cause the error (we'er using a Ubuntu 12.04 
Precise image).  Seems to have something to do with instance store 
volumes on M3 instances and blocking device mappings.  Any idea how to fix 
this?  We have RIs so we don't want to move to T2 or other 
instance types.

2016-06-11 17:37:46,940+00:00 - ERROR - scalarizr.ops.system.init - 
Operation "system.init" (id: 412be8be-66a7-4c98-83ac-0dd6ef2da89b) failed. 
Reason: 
Instance store device /dev/sdb (ephemeral0) doesn't exist. Please check 
that instance type m3.medium supports it
Traceback (most recent call last):
  File 
"/opt/scalarizr/embedded/lib/python2.7/site-packages/scalarizr-4.6.0-py2.7.egg/scalarizr/api/operation.py",
 
line 273, in _in_progress
    self._completed(self.func(self, *self.func_args, **self.func_kwds))
  File 
"/opt/scalarizr/embedded/lib/python2.7/site-packages/scalarizr-4.6.0-py2.7.egg/scalarizr/handlers/lifecycle.py",
 
line 441, in handler
    bus.fire("host_init_response", message)
  File 
"/opt/scalarizr/embedded/lib/python2.7/site-packages/scalarizr-4.6.0-py2.7.egg/scalarizr/libs/bases.py",
 
line 33, in fire
    ln(*args, **kwargs)
  File 
"/opt/scalarizr/embedded/lib/python2.7/site-packages/scalarizr-4.6.0-py2.7.egg/scalarizr/handlers/block_device.py",
 
line 103, in on_host_init_response
    self._plug_new_style_volumes(volumes)
  File 
"/opt/scalarizr/embedded/lib/python2.7/site-packages/scalarizr-4.6.0-py2.7.egg/scalarizr/handlers/block_device.py",
 
line 127, in _plug_new_style_volumes
    vol.ensure(mount=bool(vol.mpoint), mkfs=True)
  File 
"/opt/scalarizr/embedded/lib/python2.7/site-packages/scalarizr-4.6.0-py2.7.egg/scalarizr/storage2/volumes/base.py",
 
line 88, in ensure
    self._ensure()
  File 
"/opt/scalarizr/embedded/lib/python2.7/site-packages/scalarizr-4.6.0-py2.7.egg/scalarizr/storage2/volumes/ec2_ephemeral.py",
 
line 44, in _ensure
    device, self.name, __node__['platform'].get_instance_type()))

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