Hi Aimon,

In your case, having two volume services running on same physical host requires 
a little bit of hack.  Here's what I would do:
1) assign two IPs to the nova-volume physical host, say 172.16.0.1/24 and 
172.16.0.2/24.  You may also have to turn on arp_filter via echo 
'1'>/proc/net/ipv4/conf/ethX/arp_filter, where ethX is the NIC that has two IPs.
2) edit two configuration file for volume service, assign different IP to each 
one by editing 'host' flag.  For example, first volume service can use 
'host=172.16.0.1' and 2nd one can use 'host=172.16.0.2'.
3) start two services, they should work fine.

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https://bugs.launchpad.net/bugs/1039763

Title:
  Multiple nova-volume services fails to create volume on second storage
  server when using Nexenta driver

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