[root@xenserver-DS-TestServer09 ~]# xe pool-list

uuid ( RO)                : b1c803a6-88cf-7b24-4f86-b0043866d3dc

          name-label ( RW):

    name-description ( RW):

              master ( RO): 0080dd58-9609-4c9a-b159-fefd32b53ec1

          default-SR ( RW): d843e170-df59-f615-3b8f-55fd94b07c93

[root@xenserver-DS-TestServer09 ~]# xe pool-param-set uuid=b1c803a6-88cf-7b24-4f86-b0043866d3dc other-config:auto_poweron=true

[root@xenserver-DS-TestServer09 ~]#

[root@xenserver-DS-TestServer09 ~]# xe vm-list|tail -5

uuid ( RO)           : 2e86e111-e1b1-a59d-0c81-df4e8688a142

     name-label ( RW): Windows Server 2012 R2 2c4g (9)

    power-state ( RO): running

[root@xenserver-DS-TestServer09 ~]# xe vm-param-set uuid=2e86e111-e1b1-a59d-0c81-df4e8688a142 other-config:auto_poweron=true

[root@xenserver-DS-TestServer09 ~]#

[root@xenserver-DS-TestServer09 ~]# xe vm-param-remove uuid=2e86e111-e1b1-a59d-0c81-df4e8688a142 param-name=other-config param-key=auto_poweron

[root@xenserver-DS-TestServer09 ~]#