33.5 Troubleshooting

   

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In any network- related problem, first use the ping command to ensure that network is operational. Most NFS problems are related to either the configuration or NFS daemons. The /etc/exports file on an NFS server and the /etc/fstab file on a client are important to check for any configuration problem. You should also verify that all required daemons are running on the server and client. The order of starting NFS daemons also matters. For example, rpcbind or portmap should be started before starting the nfsd daemon. Similarly, the inetd daemon, which serves ARPA/Berkley and RPC services, must be started after NFS daemons have been started. HP-UX provides some commands for NFS troubleshooting. Some of these are discussed here.

The rpcinfo Command

This command verifies if a service is registered with portmap or rpcbind and is running. It contacts the rpcbind or portmap daemon and displays all registered services. A short listing of all the registered services can be displayed using the -s command-line switch as shown here.

 #  rpcinfo -s  program version(s) netid(s)                         service     owner 100000  2,3,4     udp,tcp,ticlts,ticotsord,ticots  rpcbind     superuser 100024  1         tcp,udp                          status      superuser 100021  2,4,3,1   udp,tcp                          nlockmgr    superuser 100020  1         tcp,udp                          llockmgr    superuser 100068  5,4,3,2   udp                              cmsd        superuser 100083  1         tcp                              ttdbserver  superuser 100005  3,1       tcp,udp                          mountd      superuser 100003  3,2       udp                              nfs         superuser 100069  1         tcp,udp                          ypxfrd      superuser 100028  1         udp,tcp                          ypupdated   superuser 100029  2,1       ticots,ticotsord,ticlts          keyserv     superuser 100004  1,2       tcp,udp                          ypserv      superuser 100009  1         udp                              yppasswdd   superuser 100007  1,2       udp,tcp                          ypbind      sys # 

Here you should find rpcbind , mountd , and nfs registered under the service column of the output. You can also find a list of RPC registered services on a remote host using the remote host name as the command-line argument. The following command lists all registered RPC services on host hp0 .

 rpcinfo hp0 

To verify that a service is listening to your requests and responding, make a UDP or TCP call to a particular service. The following command makes a UDP call to the nfs service on host myhp .

 #  rpcinfo -u myhp nfs  program 100003 version 2 ready and waiting program 100003 version 3 ready and waiting # 

The output shows that the host is listening to NFS requests and accepting version 2 and version 3 requests. Other options used with the rpcinfo command are shown in Table 33-4. All of these options can be used with a host name on the command line to find information about a particular host on the network.

Table 33-4. Options Used with the rpcinfo Command

Option	Description
-d	Deletes the registration of a particular program
-m	Displays statistics of RPC operation
-p	Probes rpcbind using version 2 of rpcbind
-s	Displays a short list
-t	Makes an RPC call using TCP
-u	Makes an RPC call using UDP

Using the nfsstat Command

The nfsstat command displays NFS activity on a host. By default it displays information about the client, server and RPC. Different command-line options can be used to display information about the NFS client or server only. The following is the output of the command used without any option.

 #  nfsstat  Server rpc: Connection oriented: N/A Connectionless oriented: calls                   badcalls                nullrecv 55769                   0                       0 badlen                  xdrcall                 dupchecks 0                       0                       3397 dupreqs 1 Server nfs: calls                   badcalls 55769                   0 Version 2: (0 calls) null                    getattr                 setattr 0 0%                    0 0%                    0 0% root                    lookup                  readlink 0 0%                    0 0%                    0 0% read                    wrcache                 write 0 0%                    0 0%                    0 0% create                  remove                  rename 0 0%                    0 0%                    0 0% link                    symlink                 mkdir 0 0%                    0 0%                    0 0% rmdir                   readdir                 statfs 0 0%                    0 0%                    0 0% Version 3: (55769 calls) null                    getattr                 setattr 1 0%                    243 0%                  2155 3% lookup                  access                  readlink 48700 87%               1181 2%                 0 0% read                    write                   create 5 0%                    883 1%                  359 0% mkdir                   symlink                 mknod 0 0%                    0 0%                    0 0% remove                  rmdir                   rename 0 0%                    0 0%                    0 0% link                    readdir                 readdir+ 0 0%                    0 0%                    1389 2% fsstat                  fsinfo                  pathconf 47 0%                   1 0%                    0 0% commit 805 1% Client rpc: Connection oriented: N/A Connectionless oriented: calls                   badcalls                retrans 1529                    0                       0 badxids                 timeouts                waits 0                       0                       0 newcreds                badverfs                timers 0                       0                       16 toobig                  nomem                   cantsend 0                       0                       0 bufulocks 0 Client nfs: calls                   badcalls                clgets 1529                    0                       1529 cltoomany 0 Version 2: (503 calls) null                    getattr                 setattr 0 0%                    3 0%                    0 0% root                    lookup                  readlink 0 0%                    0 0%                    0 0% read                    wrcache                 write 0 0%                    0 0%                    0 0% create                  remove                  rename 0 0%                    0 0%                    0 0% link                    symlink                 mkdir 0 0%                    0 0%                    0 0% rmdir                   readdir                 statfs 0 0%                    0 0%                    500 99% Version 3: (1026 calls) null                    getattr                 setattr 0 0%                    12 1%                   0 0% lookup                  access                  readlink 0 0%                    6 0%                    0 0% read                    write                   create 0 0%                    0 0%                    0 0% mkdir                   symlink                 mknod 0 0%                    0 0%                    0 0% remove                  rmdir                   rename 0 0%                    0 0%                    0 0% link                    readdir                 readdir+ 0 0%                    0 0%                    0 0% fsstat                  fsinfo                  pathconf 1006 98%                2 0%                    0 0% commit 0 0% # 

Fields like badcalls , nullrecv , badlen , and timeout show errors. Pay special attention to these fields. Options used with this command are listed in Table 33-5.

Table 33-5. Options Used with the nfsstat Command

Option	Description
-c	Displays client information
-s	Displays server information
-r	Displays information about RPC
-m	Displays information about all mounted file systems
-z	Can be used by the superuser only; displays NFS information and then reinitializes it

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