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Full Discussion: NFS mount hangs
Top Forums UNIX for Advanced & Expert Users NFS mount hangs Post 302214805 by robotronic on Tuesday 15th of July 2008 02:39:16 AM
Old 07-15-2008
NFS mount hangs

Last week I've installed Windows Services For UNIX on a Windows 2003 Server test machine (s2003), and exported a folder through NFS. The share is named "storage", and is used as a temporary place for very large export/dump files. Unfortunately, this is the only machine where I have access to a big, inexpensive disk and is accessible from both production and test network environments.

I was able to mount the nfs share in read/write mode on two Solaris' servers, using the command:
Code:
mount -F nfs -o hard,rsize=32768,wsize=32768 s2003:/storage /storage

The two machines are called, respectively:
- eprod, SunOS 5.8
- etest, SunOS 5.10

I've intensively used the mounted file system without any problems, from both machines. But today, while issuing a "ls" command on eprod, I've noticed the message:

Code:
NFS server s2003 not responding still trying

On etest, I didn't have any issue and the remote share is still mounted and working.

So I thought that maybe there was a network problem in the weekend, and tried to umount and remount "/storage" on eprod:

Code:
eprod/root> umount s2003:/storage
nfs umount: /storage: is busy

eprod/root> fuser /storage        # The command hangs indefinitely (interrupted with ^C)
/storage:

eprod/root> fuser -c /storage     # The command works and it doesn't report anything
/storage:

So, I've tried the hard way, and it worked:
Code:
umount -f /storage

The problem now is that I am not able to mount the filesystem anymore:
Code:
eprod/root> mount -F nfs -o hard,rsize=32768,wsize=32768 s2003:/storage /storage
NFS server s2003 not responding still trying

The command "hangs" indefinitely... I've already performed basic connection tests from eprod to s2003:
- ping works
- telnet s2003 on port 2049 works

I've also tried to monitor network traffic with netstat and snoop while issuing the mount command:

Code:
eprod/root> netstat -a | grep s2003
eprod.login         s2003.nfsd          0      0 24820      0 SYN_SENT
eprod.53759         s2003.nfsd      65415      0 24820      0 TIME_WAIT

Code:
eprod/root> snoop s2003
Using device /dev/ce (promiscuous mode)
       eprod ->  s2003   PORTMAP C GETPORT prog=100005 (MOUNT) vers=3 proto=UDP
       s2003 ->  eprod   PORTMAP R GETPORT port=1048
       eprod ->  s2003   MOUNT3 C Null
       s2003 ->  eprod   MOUNT3 R Null 
       eprod ->  s2003   MOUNT3 C Mount /storage
       s2003 ->  eprod   MOUNT3 R Mount OK FH=7593 Auth=none,unix
       eprod ->  s2003   PORTMAP C GETPORT prog=100003 (NFS) vers=3 proto=TCP
       s2003 ->  eprod   PORTMAP R GETPORT port=2049
       eprod ->  s2003   TCP D=2049 S=51997 Syn Seq=1199030867 Len=0 Win=24820 Options=<nop,nop,sackOK,mss 1460>
       s2003 ->  eprod   TCP D=51997 S=2049 Syn Ack=1199030868 Seq=2849360585 Len=0 Win=16384 Options=<mss 1460,nop,nop,sackOK>
       eprod ->  s2003   TCP D=2049 S=51997     Ack=2849360586 Seq=1199030868 Len=0 Win=24820
       eprod ->  s2003   NFS C NULL3
       s2003 ->  eprod   NFS R NULL3 
       eprod ->  s2003   TCP D=2049 S=51997     Ack=2849360614 Seq=1199030988 Len=0 Win=24820
       eprod ->  s2003   TCP D=2049 S=51997 Fin Ack=2849360614 Seq=1199030988 Len=0 Win=24820
       s2003 ->  eprod   TCP D=51997 S=2049     Ack=1199030989 Seq=2849360614 Len=0 Win=65415
       s2003 ->  eprod   TCP D=51997 S=2049 Fin Ack=1199030989 Seq=2849360614 Len=0 Win=65415
       eprod ->  s2003   TCP D=2049 S=51997     Ack=2849360615 Seq=1199030989 Len=0 Win=24820
       eprod ->  s2003   RLOGIN R port=2049 
       eprod ->  s2003   RLOGIN R port=2049 
       eprod ->  s2003   RLOGIN R port=2049 
       ...
       eprod ->  s2003   RLOGIN R port=2049 
       eprod ->  s2003   RLOGIN R port=2049 
       ...
       ...
       ... and so on

I exclude possible problems on s2003, because I can mount "/storage" folder from other machines on the same network of eprod.

I've also found that using udp protocol instead of tcp (default) works:
Code:
mount -F nfs -o hard,rsize=32768,wsize=32768,proto=udp s2003:/storage /storage

What could be the problem? How can I solve this issue?

Thanks in advance!

Smilie
 

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