Open Stack

Hi,
   I am usign devstack and spawned Nova instance using the default
cirros-0.3.2-x86_64-uec
image that comes along w/ devstack.

When i use m1.micro or m1.nano flavour
I see that the qemu process uses -vnc <ip> and instance name is
instance-XXXXX

but

When i use m1.tiny flavour
I see that qemu process does not have -vnc and instance name is guestfs-XXX
and uses libguestfs stuff

I am trying to understand why changing the flavours causes the above to
happen ?
How are they related ?

thanx,
deepak
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