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Hi! I would like to get some help configuring my compute nodes to use
multipath when establishing iscsi connections with a IBM Storwize v3700
storage.

I have 1 controller, 1 network node and 2 compute nodes. The IBM Storwize
driver is configured on controller and volumes can be created and attached
to instances running on compute nodes.

However, my storage has 2 nodes (canisters or controllers) and each one has
two 10G interfaces for iscsi use. So, I have four IPs configured as iscsi
at storage. But, when I attach a volume to some virtual machine, the
compute node uses the first IP of the 'primary' controller (IBM calls this
by 'config node').

I've read a lot of documentation but I couldn't find certainly what I need
to configure neither where I need to put these configuration.

What I've already read is that this model of storage doesn't answer to
iscsi calls with a list of available iscsi IPs, as do some others
equipments. So, I need some way to tell nova that I have more than one IP
address available, so iscsi commands can connect using not just one IP.

Making compute nodes connect to 2 iscsi IPs then I can use multipath. I've
already configured multipath on compute nodes but it isn't used.

So:

- how to configure nova to use multipath?
- how to configure nova to make more than one iscsi connection?

I appreciate ANY help, documentation, configuration examples etc.

Thanks!
:)

- JLC
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