[Openstack] IO flow on multi-node setup

Bernd Bausch berndbausch at gmail.com
Fri Oct 26 12:18:26 UTC 2018

Volume I/O won't flow through the controller. The LVM reference driver,
for example, sets up an iSCSI target on the storage node, which the
compute node then imports. The NFS driver has the compute node mount the
exported filesystem. Depending on the driver, I/O may even flow directly
between an iSCSI or fibre-channel disk array and the compute node.

What storage backend(s) are you deploying?

On 10/26/2018 6:50 PM, Tushar Tyagi wrote:
> Hello,
> I have a requirement to create a multi node setup with Controller, Compute and Storage nodes on different machines. 
> In case I create a virtual machine on the compute node, it's going to be provisioned by the Controller node and the storage is going to be provided by the Storage node. In case I require any more volumes, the same are going to be provisioned by the Storage node, and then can be attached to the VM.
> I wanted to know will the IO requests from Compute to Storage node go via Controller or will these be direct? In case it's the former, how much performance impact will be there due to the added redirection?
> Thanks,
> Tushar 
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