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I have several Ubuntu Server (12.04 LTS) virtual machines. Some are idle and some are processing background tasks, etc.

However, when I try to login (SSH) to the servers, it often takes several seconds but subsequent login (within a short amount of time) are very quick which makes me think the server is going to sleep after a certain amount of idle time.

(This might be my virtual server [ESXi] causing this, but I haven't found anything...)

marked as duplicate by Seth, Braiam, Alaa Ali, Eric Carvalho, user117103 Sep 8 '13 at 17:44

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A couple things that come to mind that it could be:

  • A bios power management system that is causing a sleep mode
  • Hard drive spin up time

Although the chances of those options are low given that they are virtual machines... unless they are located on another drive. I dont believe that Ubuntu server has a sleep mode active by default, although it is possible to allow it to sleep.

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