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1. Requested CPUs are not available for requested walltime. Cluster is busy (example1).
2. Requested RAM(memory) is not available for requested walltime. 

   {expand: Memory example}
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   {expand}

3. Requested RAM(memory) doesn't exist on cluster per host. The output from bjobs won't tell directly this reason.  
4. Requested GPUs are not available for requested walltime.
5. GPU type doesn't exist on cluster.  The correct syntax for available GPUs can be found  with lshost --gpu
6. Nodes are in system level reservation used for rolling upgrade or for scheduling cluster level downtime.
7. Nodes are reserved under SLA.  

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