Ceph » CephFS

running ceph-mds -d -i ceph --journal-check 0 gives me following output:

--conf/-c FILE    read configuration from the given configuration file
  --id/-i ID        set ID portion of my name
  --name/-n TYPE.ID set name
  --cluster NAME    set cluster name (default: ceph)
  --setuser USER    set uid to user or uid (and gid to user's gid)
  --setgroup GROUP  set gid to group or gid 
  --version         show version and quit
  -d                run in foreground, log to stderr.
  -f                run in foreground, log to usual location.
  --debug_ms N      set message debug level (e.g. 1)
 2016-10-31 10:44:07.101716 7f622f8c6180  0 ceph version 10.2.3 (ecc23778eb545d8dd55e2e4735b53cc93f92e65b), process ceph-mds, pid 84116
 2016-10-31 10:44:07.101735 7f622f8c6180 -1 Error: can't understand argument: --journal-check
 2016-10-31 10:44:07.101739 7f622f8c6180 -1 usage: ceph-mds -i name [flags] [[--journal_check rank]|[--hot-standby[rank]]
  -m monitorip:port
        connect to monitor at given address
  --debug_mds n
        debug MDS level (e.g. 10) 
  --journal-check rank
        replay the journal for rank, then exit
  --hot-standby rank
        start up as a hot standby for rank

Running "ceph-mds -d -i ceph" works without issue. (and worked some weeks, running my test instance of CephFS.)
I am trying to run this command because I got "mds rank 0 has failed / mds cluster is degraded", probably because of a full OSD.

In the documentation is to be found "--journal-check" as well as "--journal_check".
I tried both, same results. The code and the documentation should be homogenized.

Many thanks !