[Users] NFS data domain use host + local storage question

Itamar Heim iheim at redhat.com
Thu Jul 25 14:53:28 EDT 2013

On 07/25/2013 04:55 PM, Jason Keltz wrote:
>>> I'm also puzzled by this statement: "A local storage domain can be set
>>> up on a host. When you set up host to use local storage, the host
>>> automatically gets added to a new data center and cluster that no other
>>> hosts can be added to. Multiple host clusters require that all hosts
>>> have access to all storage domains, which is not possible with local
>>> storage. Virtual machines created in a single host cluster cannot be
>>> migrated, fenced or scheduled. "
>>> So .. let's say I have two nodes, both of them have some local disk, and
>>> use the NFS data store.  I can see why I wouldn't be able to migrate a
>>> host from one node to the other IF that has was using local data storage
>>> for the specific virtual machine.  On the other hand, if it's a VM that
>>> is NOT using local storage, and everything is in the NFS datastore, then
>>> does this I can't migrate it because each host would have to be in its
>>> own cluster only because it has local storage for *some* of the VMs!?
>> Each local storage host requires it's own datacenter and you can't mix a
>> datacenter with local storage with NFS storage.
> sigh.  This seems so rigid!  I understand, for example, why clusters
> must encompass same CPU type.  I do not understand why a host cannot
> connect to both local data storage, and NFS storage.

it's a legacy limitation we are working on eliminating

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