2 probs after upgrading to emporer

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Hi,
maybe you can help us with following probs:
if you need more info about our cluster or any debugging log I will be happy to help

Environment:
-------------------

Small test cluster with 7 node, 1 osd per node
Upgrade from dumpling to emporer 0.72.1


2 Problems after upgrade:
-----------------------------------

- ceph -s shows <health HEALTH_WARN pool images has too few pgs>
  - changing pg_num etc from 1024 to 1600 has no effect
  - after setting <mon_pg_warn_min_objects> to a larger value the cluster moves to HEALTH_OK

- 20 pools
  create new pool
  wait until pool is ready
  delete pool again
  ceph -s still shows 21 pools

  stop first mon, wait, start mon again
  ceph -s shows 20 pools, 21 pools, 20 pools, ... changing every n (~ 2) secs

  stop second mon, wait, start mon again
  ceph -s shows 20 pools, 21 pools, 20 pools, ... changing every m > n secs

  stop third mon, wait, start mon again
  ceph -s shows 20 pools ... stable


Some infos about the cluster:
----------------------------------------

# uname –a
Linux host1 3.2.0-53-generic #81-Ubuntu SMP Thu Aug 22 21:01:03 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux


# ceph --version
ceph version 0.72.1 (4d923861868f6a15dcb33fef7f50f674997322de)

# ceph -s
    cluster 3f4a289a-ad40-40e7-8204-ab38affb18f8
     health HEALTH_WARN pool images has too few pgs
     monmap e1: 3 mons at {host1=10.255.NNN.NN:6789/0,host2=10.255.NNN.NN:6789/0,host3=10.255.NNN.NN:6789/0},\
                election epoch 306, quorum 0,1,2 host1,host2,host3
     mdsmap e21: 1/1/1 up {0=host4=up:active}
     osdmap e419: 7 osds: 7 up, 7 in
      pgmap v815042: 17152 pgs, 21 pools, 97795 MB data, 50433 objects
            146 GB used, 693 GB / 839 GB avail
               17152 active+clean
  client io 25329 kB/s wr, 39 op/s


# ceph osd dump
epoch 419
fsid 3f4a289a-ad40-40e7-8204-ab38affb18f8
created 2013-09-27 14:37:13.601605
modified 2013-11-20 16:55:35.791740
flags

pool 0 'data' rep size 2 min_size 1 crush_ruleset 0 object_hash rjenkins pg_num 64 pgp_num 64 last_change 1 owner 0 crash_replay_interval 45
pool 1 'metadata' rep size 2 min_size 1 crush_ruleset 1 object_hash rjenkins pg_num 64 pgp_num 64 last_change 1 owner 0
pool 2 'rbd' rep size 2 min_size 1 crush_ruleset 2 object_hash rjenkins pg_num 64 pgp_num 64 last_change 1 owner 0
pool 3 'images' rep size 2 min_size 1 crush_ruleset 0 object_hash rjenkins pg_num 1600 pgp_num 1600 last_change 367 owner 0
  removed_snaps [1~1,3~2]
...
...

# rados lspools | wc -l
20


Greetings
Michael


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