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The more resources that you request, the longer it will take for the LSF accumulate the resources to satisfy them.  Jobs which request resources that the cluster does not possess will remain in the pending state indefinitely.  These are the maximum resources available:

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*The maximum walltime on lilac is 7 days and on Juno is 31 days. Jobs that are less than 6 hours can run on any node. But those longer than 6 hours can only run on nodes with SLA or on a subset of the shared nodes.

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