6027-1542 [A] Old shared memory exists but it is not valid nor cleanable.

Explanation

A new GPFS daemon started and found existing shared segments. The contents were not recognizable, so the GPFS daemon could not clean them up.

User response

  1. Stop the GPFS daemon from trying to start by issuing the mmshutdown command for the nodes having the problem.
  2. Find the owner of the shared segments with keys from 0x9283a0ca through 0x9283a0d1. If a non-GPFS program owns these segments, GPFS cannot run on this node.
  3. If these segments are left over from a previous GPFS daemon:
    1. Remove them by issuing: 
      ipcrm -m shared_memory_id
    2. Restart GPFS by issuing the mmstartup command on the affected nodes.