CreateDataPool Gatling test: INTERNAL SERVER ERROR

ERROR [0.000s]: setUpClass (rbd.test_rbd_create.RbdCreateDataPoolTestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/jenkins/workspace/workspace/oa-test-gui-branch-sle-2/gatling/rbd/scenarios.py", line 31, in setUpClass
    cls.replicated_pool_1 = cls.create_test_pool('gatling_pool_replicated_1', 'replicated')
  File "/home/jenkins/workspace/workspace/oa-test-gui-branch-sle-2/gatling/rbd/scenarios.py", line 64, in create_test_pool
    res = cls.send_ceph_request('POST', cls.fsid, 'pools', data=pool_data)
  File "/home/jenkins/workspace/workspace/oa-test-gui-branch-sle-2/gatling/testcase.py", line 376, in send_ceph_request
    res = cls._do_request(method, url, headers, data=data)
  File "/home/jenkins/workspace/workspace/oa-test-gui-branch-sle-2/gatling/testcase.py", line 344, in _do_request
    request=e.request)
requests.exceptions.HTTPError: 500 Server Error: INTERNAL SERVER ERROR for url: http://oa-host/openattic/api/ceph/9790dd3b-2051-3c7d-a024-2aaa9f9c27c1/pools content: {"detail": "Executing \"osd pool create pool_type=replicated pg_num=1 pool=gatling_pool_replicated_1 pgp_num=1\" failed: \" pg_num 1 size 3 would mean 10587 total pgs, which exceeds max 7800 (mon_max_pg_per_osd 200 * num_in_osds 39)\" code=ERANGE"}

2017-12-15 04:03:49,162 2798 mod_wsgi ERROR exception#custom_handler - Internal Server Error: None
Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/rest_framework/views.py", line 400, in dispatch
    response = handler(request, *args, **kwargs)
  File "/usr/lib/python2.7/site-packages/rest_framework/mixins.py", line 54, in create
    self.object = serializer.save(force_insert=True)
  File "/usr/lib/python2.7/site-packages/rest_framework/serializers.py", line 599, in save
    self.save_object(self.object, **kwargs)
  File "/usr/lib/python2.7/site-packages/rest_framework/serializers.py", line 1041, in save_object
    obj.save(**kwargs)
  File "/srv/openattic/backend/ceph/models.py", line 440, in save
    None)
  File "/srv/openattic/backend/ceph/librados.py", line 461, in wrapper
    ret = next(runner)
  File "/srv/openattic/backend/ceph/librados.py", line 641, in osd_pool_create
    output_format='string')
  File "/srv/openattic/backend/ceph/librados.py", line 1059, in _call_mon_command
    timeout)
  File "/srv/openattic/backend/ceph/librados.py", line 439, in call_librados
    return run_in_external_process(with_client, cmd_name, timeout)
  File "/srv/openattic/backend/utilities.py", line 163, in run_in_external_process
    raise res
ExternalCommandError: Executing "osd pool create pool_type=replicated pg_num=1 pool=gatling_pool_replicated_1 pgp_num=1" failed: " pg_num 1 size 3 would mean 10587 total pgs, which exceeds max 7800 (mon_max_pg_per_osd 200 * num_in_osds 39)" code=ERANGE