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Head node offline - what does it do RRS feed

  • Question

  • If a head node is only a head node, what consequence does being on or offline have?  Our head node is offline on a test cluster, but it's still doing its job as a head node, handling scheduling, etc...  Which is fine, but I'm just wondering what the consequences *are* of taking it offline.
    Wednesday, August 4, 2010 11:41 PM

Answers

  • you can still submit jobs and interact with a head node that is online.  As Ahriman_tsk points out below, it talks about its scheduler availability (can jobs or work be scheduled on it).  This is relevant if it is not only a head node, but also a Broker or Compute Node (or both - valid combinations are either HN only, HN+BN, HN+CN or HN+BN+CN).  A node that is a HN only doesn't make a difference if it is offline or online.

     

    Mark

    Friday, August 6, 2010 4:36 AM

All replies

  • When a node is in OFFLINE state it doesn't calculate something and that's all.

    So i can advice you to set a state of your HN as OFFLINE.

    Thursday, August 5, 2010 12:25 PM
  • you can still submit jobs and interact with a head node that is online.  As Ahriman_tsk points out below, it talks about its scheduler availability (can jobs or work be scheduled on it).  This is relevant if it is not only a head node, but also a Broker or Compute Node (or both - valid combinations are either HN only, HN+BN, HN+CN or HN+BN+CN).  A node that is a HN only doesn't make a difference if it is offline or online.

     

    Mark

    Friday, August 6, 2010 4:36 AM