Comment 13 for bug 1903221

Przemyslaw, I think kernel.pid_max can be explained by the ceph-osd config option 'sysctl'. I'm not sure about the others.

  sysctl:
    type: string
    default: '{ kernel.pid_max : 2097152, vm.max_map_count : 524288,
                kernel.threads-max: 2097152 }'
    description: |
      YAML-formatted associative array of sysctl key/value pairs to be set
      persistently. By default we set pid_max, max_map_count and
      threads-max to a high value to avoid problems with large numbers (>20)
      of OSDs recovering. very large clusters should set those values even
      higher (e.g. max for kernel.pid_max is 4194303).