database is open on another node in a mode not  compatible  with
  this node

  Explanation:  Another node has already opened the  database  and
  the  database  uses  some  feature  that  makes it impossible to
  concurrently open the database on this node.   For  example,  if
  Row  Cache  is  enabled,  then  all  nodes must be able to share
  memory (OpenVMS Galaxy).  If global  buffers  are  enabled  then
  every  node  that is a member of the same Galaxy system must use
  the same global buffer parameters when opening the database.