Here's what NFS4 is doing.   I ran nfsstat -Z and it shows a lot of activity, 
even though the disk itself isn't active.   I don't know enough about NFS4 to 
interpret this, but there are a thousands of
"lock" calls per second, and thousands of "renews" per second, both of which 
seem strange.
And lots of "write" calls per second that don't cause any disk activity.   
Odd...

$ nfsstat -Z
Collecting statistics; press CTRL-C to view results from interval (i.e., from 
pause to CTRL-C).
^CSignal received; displaying (only) statistics gathered over the last 0 
minutes, 3 seconds:

Server rpc stats:
calls      badcalls   badauth    badclnt    xdrcall
59790      0          0          0          0       

Server nfs v4:
null         compound     
0         0% 59790   100% 

Server nfs v4 operations:
op0-unused   op1-unused   op2-future   access       close        commit       
0         0% 0         0% 0         0% 0         0% 0         0% 0         0% 
create       delegpurge   delegreturn  getattr      getfh        link         
0         0% 0         0% 0         0% 0         0% 0         0% 0         0% 
lock         lockt        locku        lookup       lookup_root  nverify      
19930    20% 0         0% 0         0% 0         0% 0         0% 0         0% 
open         openattr     open_conf    open_dgrd    putfh        putpubfh     
0         0% 0         0% 0         0% 0         0% 39860    40% 0         0% 
putrootfh    read         readdir      readlink     remove       rename       
0         0% 0         0% 0         0% 0         0% 0         0% 0         0% 
renew        restorefh    savefh       secinfo      setattr      setcltid     
19930    20% 0         0% 0         0% 0         0% 0         0% 0         0% 
setcltidconf verify       write        rellockowner bc_ctl       bind_conn    
0         0% 0         0% 19930    20% 0         0% 0         0% 0         0% 
exchange_id  create_ses   destroy_ses  free_stateid getdirdeleg  getdevinfo   
0         0% 0         0% 0         0% 0         0% 0         0% 0         0% 
getdevlist   layoutcommit layoutget    layoutreturn secinfononam sequence     
0         0% 0         0% 0         0% 0         0% 0         0% 0         0% 
set_ssv      test_stateid want_deleg   destroy_clid reclaim_comp 
0         0% 0         0% 0         0% 0         0% 0         0% 

Client rpc stats:
calls      retrans    authrefrsh
59784      0          0

-- 
bzr diff freezes; kill -9 doesn't kill it.
https://bugs.launchpad.net/bugs/665082
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