System Administration Guide: Network Services

Examples–Displaying NFS Server and Client Statistics

The following example displays RPC and NFS data for the client pluto.

$ nfsstat -c

Client rpc:
Connection oriented:
calls    badcalls  badxids  timeouts newcreds  badverfs   timers     
1595799  1511      59       297      0         0          0          
cantconn nomem     interrupts 
1198      0         7          
Connectionless:
calls    badcalls  retrans  badxids  timeouts  newcreds   badverfs   
80785    3135      25029    193      9543      0          0          
timers   nomem     cantsend   
17399    0         0          

Client nfs:
calls    badcalls  clgets   cltoomany  
1640097  3112      1640097  0          
Version 2: (46366 calls)
null     getattr   setattr  root     lookup     readlink  read       
0 0%     6589 14%  2202 4%  0 0%     11506 24%  0 0%      7654 16%   
wrcache  write     create   remove   rename     link      symlink    
0 0%     13297 28% 1081 2%  0 0%     0 0%       0 0%      0 0%       
mkdir    rmdir     readdir  statfs     
24 0%    0 0%      906 1%   3107 6%    
Version 3: (1585571 calls)
null    getattr    setattr  lookup     access     readlink  read     
0 0%    508406 32% 10209 0% 263441 16% 400845 25% 3065 0%  117959 7%
write    create     mkdir    symlink    mknod    remove   rmdir 
69201 4% 7615 0%    42 0%    16 0%      0 0%     7875 0%  51 0%      
rename   link       readdir  readdir+   fsstat   fsinfo   pathconf   
929 0%   597 0%     3986 0%  185145 11% 942 0%   300 0%   583 0%     
commit     
4364 0%    
 
Client nfs_acl:
Version 2: (3105 calls)
null       getacl     setacl     getattr    access     
0 0%       0 0%       0 0%       3105 100%  0 0%       
Version 3: (5055 calls)
null       getacl     setacl     
0 0%       5055 100%  0 0%

The output of the nfsstat -c command is described in Table 30–4.

Table 30–4 Output From the nfsstat -c Command


Field	Description
`calls`	The total number of calls that were sent.
`badcalls`	The total number of calls that were rejected by RPC.
`retrans`	The total number of retransmissions. For this client, the number of retransmissions is less than 1 percent, or approximately 10 timeouts out of 6888 calls. These retransmissions might be caused by temporary failures. Higher rates might indicate a problem.
`badxid`	The number of times that a duplicate acknowledgment was received for a single NFS request.
`timeout`	The number of calls that timed out.
`wait`	The number of times a call had to wait because no client handle was available.
`newcred`	The number of times the authentication information had to be refreshed.
`timers`	The number of times the time-out value was greater than or equal to the specified time-out value for a call.
`readlink`	The number of times a `read` was made to a symbolic link. If this number is high, at over 10 percent, then there could be too many symbolic links.

The following example shows output from the nfsstat -m command.

pluto$ nfsstat -m
/usr/man from pluto:/export/svr4/man
Flags: vers=2,proto=udp,auth=unix,hard,intr,dynamic,
        rsize=8192, wsize=8192,retrans=5
 Lookups: srtt=13 (32ms), dev=10 (50ms), cur=6 (120ms)
 All:     srtt=13 (32ms), dev=10 (50ms), cur=6 (120ms)

This output of the nfsstat -m command, which is displayed in milliseconds, is described in Table 30–5.

Table 30–5 Output From the nfsstat -m Command


Field	Description
`srtt`	The smoothed average of the round-trip times
`dev`	The average deviations
`cur`	The current “expected” response time

If you suspect that the hardware components of your network are creating problems, you need to look closely at the cabling and connectors.