Open Stack

Hello Vahric and list! Thank you for the answer!

I've analyzed documentation you indicated. Although one of that be related
with a Huawei product, the answer for the problem was there, exactly what
reported:

If the version of OpenStack is Havana and IceHouse, add
libvirt_iscsi_use_multipath = True in [default] of /etc/nova/nova.conf. If
the version of OpenStack is Juno, Kilo, and Liberty, add
iscsi_use_multipath = True in [libvirt] of /etc/nova/nova.conf.

So, to use IBM Storwize with iSCSI multipath we need:

- configure Storwize driver to manage the storage;
- configure multipath on compute nodes;
- add libvirt_iscsi_use_multipath = True or iscsi_use_multipath = True
depending of the running version.

When attaching a volume to one instance, Storwize driver will connect on
storage via management interface (normally via ssh), get parameters about
available iSCSI IPs and make the compute nodes run iscsiadm in a manner
that connects to all of theses IPs. At this moment, running multipath -ll
on the compute node that executes the virtual machine on which the volume
was attached, we could see the available paths!

I've created a solicitation to include these information on Storwize driver
documentation.

https://bugs.launchpad.net/openstack-manuals/+bug/1564442

Thank you!!
:)

- JLC

On Wed, Mar 30, 2016 at 5:17 PM, Vahric Muhtaryan <vahric at doruk.net.tr>
wrote:

> Hello ,
> To be an example I find out 3PAR documentation which HPE newly implement
> multipath with liberty and config is on pdf
> http://www8.hp.com/h20195/v2/GetPDF.aspx%2F4AA5-1930ENW.pdf
> I am also IBM customer but using FC but for iscsi I checked liberty
> configuration reference and looks like from Grizzly its supported
> But on of other ibm documentation is saying its controlled by Nova
>
> https://www.ibm.com/support/knowledgecenter/#!/SST55W_4.1.0/liaca/liaca_configuring_storwize_driver.html
> Then I find out this
> http://docs.openstack.org/liberty/config-reference/content/config-iscsi-multipath.html ,
> looks like after Juno it should be configured by openstack admin in
> nova.conf under libvirt section manually .
>
> Hope you can success
> Pls inform me
> Regards
> VM
>
> From: Jorge Luiz Correa <correajl at gmail.com>
> Date: Wednesday 30 March 2016 at 21:18
> To: <openstack at lists.openstack.org>
> Subject: [Openstack] Help configuring multipath with IBM storwize v3700.
>
> 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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