ns [stat|mutex|compact|master|cache]
  print or configure basic namespace parameters
  ns stat [-a] [-m] [-n] [--reset]
  print namespace statistics
  -a      : break down by uid/gid
  -m      : display in monitoring format <key>=<value>
  -n      : display numerical uid/gid(s)
  --reset : reset namespace counters

ns mutex [<option>]
manage mutex monitoring. Option can be:
--toggletime     : toggle the timing
--toggleorder    : toggle the order
--toggledeadlock : toggle deadlock check
--smplrate1      : set timing sample rate at 1% (default, no slow-down)
--smplrate10     : set timing sample rate at 10% (medium slow-down)
--smplrate100    : set timing sample rate at 100% (severe slow-down)

ns compact off|on <delay> [<interval>] [<type>]
enable online compaction after <delay> seconds
<interval> : if >0 then compaction is repeated automatically
after so many seconds
<type>     : can be 'files', 'directories' or 'all'. By default  only the file
changelog is compacted. The repair flag can be indicated by using
'files-repair', 'directories-repair' or 'all-repair'.
ns master [<option>]
master/slave operations. Option can be:
<master_hostname> : set hostname of MGM master RW daemon
--log             : show master log
--log-clear       : clean master log
--enable          : enable the slave/master supervisor thread modifying stall/
redirectorion rules
--disable         : disable supervisor thread

ns recompute_tree_size <path>|cid:<decimal_id>|cxid:<hex_id> [--depth <val>]
recompute the tree size of a directory and all its subdirectories
--depth : maximum depth for recomputation, default 0 i.e no limit

ns recompute_quotanode <path>|cid:<decimal_id>|cxid:<hex_id>
recompute the specified quotanode

ns cache set|drop [-d|-f] [<max_num>] [<max_size>K|M|G...]
set the max number of entries or the max size of the cache. Use the
ns stat command to see the current values.
set        : update cache size for files or directories
drop       : drop cached file and/or directory entries
-d         : control the directory cache
-f         : control the file cache
<max_num>  : max number of entries
<max_size> : max size of the cache - not implemented yet
ns cache drop-single-file <id of file to drop>
force refresh of the given FileMD by dropping it from the cache
ns cache drop-single-container <id of container to drop>
force refresh of the given ContainerMD by dropping it from the cache
ns max_drain_threads <num>
set the max number of threads in the drain pool, default 400, minimum 4

ns reserve-ids <file id> <container id>
blacklist file and container IDs below the given threshold. The namespace
will not allocate any file or container with IDs less than, or equal to the
given blacklist thresholds.