Long Shutdowns During reboots

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I have been dealing with a vexing issue where reboots on a CentOS 6.5 where reboots take 30 to 45 minutes.  
My configuration: 

* 32 LUNS and 32 network portals.
* 2 ConnectX3 iser
* Observed on 3.12.19, reproduced on target-pending.

What seems to be happening is that targets/LUNS are released after the network interfaces are brought down, this leads to what I would assume to be time outs and long release time for each LUN/target.  

Running /etc/init.d/target stop works as expected.

Has this been observed on other distributions?

How can we change the behavior such that targets/LUNS are released before network interfaces are brought down.

Thank you.


Moussa
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