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Hi hao wang,

Firstly, I agree with you that healthy backend is a requirement for 
creating 
volumes, as the same as service-up. So, monitor the state of backend is 
useful.

While, ServiceGroup is only used for detecting state of service quickly, 
So whether
backend is up or not is not taken into consideration for ServiceGroup.

So, I think there is no priority between them. 

Thank you.
Janice



> hi, Janice
>
> This idea seems to me that is useful to detect the state of
> cinder-volume process more quickly, but I feel there is another issue
> that if the back-end device go to fail you still
> can't keep cloud in ha or create volume successfully since the service
> is up but device is down.
> 
> So, what I want to say is we maybe need to consider to detect and
> report the device state priority[1] and then consider to improve
> service if we need that.

> [1]https://review.openstack.org/#/c/252921/

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