If a job is forwarded to a remote cluster and then fails to start, it returns to the submission queue and LSF retries the job. After a certain number of failed retry attempts, LSF suspends the job (PSUSP). The job remains in that state until the job owner or administrator takes action to resume, modify, or remove the job.
By default, LSF tries to start a job up to 6 times (the threshold is 5 retry attempts). The retry threshold is configurable.
You can also configure LSF to send email to the job owner when the job is suspended. This allows the job owner to investigate the problem promptly. By default, LSF does not alert users when a job has reached its retry threshold.