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Libvrit does support ISCSI LUN as backends, meaning you can mount the ISCSI block on every compute node and you should be fine
- Razique

On Oct 28, 2013, at 8:54, Chris Friesen <chris.friesen at windriver.com> wrote:

> On 10/28/2013 09:35 AM, Ray Sun wrote:
>> Daniel,
>> Thanks for you response. But I am still confusing about use a iscsi
>> device, if I want to use it as shared storage, first I need to attach to
>> a node as a block storage, then I mount it to other compute nodes using
>> NFS. The problem is that this will make a big lost on performance.
>> Currently nova already support to create a new VM on ceph RBD, but why
>> we can not create it on a block storage?
> 
> ceph and NFS are both designed for simultaneous access by multiple clients.
> 
> iSCSI is not.
> 
> Chris
> 
> 
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