running out of semaphores on boot

Solution Verified - Updated -


  • omsa doesn't start
  • Oracle fails to start with the error "OS system dependent operation:semget failed with status: 28"
  • /var/log/messages has entries: Server Administrator (Shared Library): Data Engine EventID: A semaphore set has to be created but the system limit for the maximum number of semaphore sets has been exceeded
  • The semaphore problem seems to occur after the luns have been scanned, partitioned, and labeled for oracleasm.


  • Red Hat Enterprise Linux 5 - All Architectures
  • EMC Powerpath drivers installed and configured on boot.

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