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Vladislav,

Setting up the volume instances as active/passive has been done by a 
number of users for quite some time and it has been working fine, as far 
as I know.  If you are looking for an HA setup right now, that is the 
safest approach.

We have been working on getting HA (Active/Active) support into Cinder 
and much of the support is there but we are still working on determining 
how we can test and validate that drivers do functions in Active/Active 
mode.  Once we have agreement on the testing process you will see 
drivers getting marked as supporting Active/Active HA.

Hope this information helps.

Jay



On 9/12/2017 8:09 AM, vladislav.belogrudov at oracle.com wrote:
> Hi,
>
> I'm testing multinode cluster with several cinder-volume instances. 
> The latter are configured with iSCSI storage (ZFSSA). To enable HA of 
> cinder-volume I had to specify 'host' option, otherwise volumes will 
> be bound to a specific host (only good for LVM driver). This works so 
> far but I am concerned about reported issues like race conditions:
>
>     https://bugzilla.redhat.com/show_bug.cgi?id=1193229
>
> Is Active / Passive requirement for non-local (iSCSI-like) backends 
> still valid? I also see 'cluster' option for A/A which still is 'not 
> supported':
>
>     https://docs.openstack.org/cinder/pike/sample_config.html
>
> Thanks,
> Vladislav Belogrudov
>
>
>
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