I have installed a cluster computer with 10 nodes . The manufacturer is HP . All nodes and the master node have redhat enterprise linux installed in them .
When I shutdown the nodes from the master terminal using "shutdown -h now" they get shutdown .
But they dont get completely turned off . This issue bothers me when the power supply is given , all nodes boot up simultaneously generating a huge heat .

Thing to note :
When we shutdown our PC they get completely turned off . When the power supply is given , a press on the Power On button is required to boot the system.

But , why does it not happpen in the case of cluster? Is there any other way of completely turning off the nodes from the master terminal ?

Thanks in advance , guys !!

The behavior after a power loss can be defined in the BIOS, where you often have options like on, off or last state. Looks like it's set to on on your servers.

Whether this will also change the shutdown behavior, I don't know. I saw cases, where an update to the kernel enabled a proper shutdown. But I never got an explanation, what was not working fine before or not supported by the former kernel.