Primary storage: does it make sense/is it valid to have it local/unshared?

[Steve Roth]

Hi all,

I am looking at CloudStack for internal testing.   (ie not a production 
environment -- HA is not required).    We have (2) KVM hypervisors in 
our CS environment.

I'm curious if folks have ever placed primary storage directly on the 
hypervisors (as opposed to a NAS).  I understand this would negate the 
HA features, but I'm curious if there are other impacts.

The main driving reason for us is because our NAS is on a different 
subnet than our hypervisors, so having primary storage on the NAS I 
think would slow things significantly.

Is this a valid configuration?    All the docs seem to recommend primary 
storage should be on a NAS.

If it is valid, is it possible to make it 'unshared' / hypervisor-specific?

I'm curious if anyone has done this before.

Thanks
-Steve