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NFS umount problem, Solaris 7

2007-12-24 19:37:00

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Hi,
I have two computers, both Sun SPARC running Solaris 7 (both
well-patched). System A is exporting a filesystem to system B.
When System B reboots (proper shutdown followed by reset), somehow system
A thinks the connection is still up - doing a netstat shows a TCP
connection from system B to system A port 2049 as ESTABLISHED.

Then when system B boots back, it tries again to mount from system A which
fails because system A thinks the connection is still up - instead of
answer the SYN by SYN-ACK, it only sends an ACK.
After a very long time, the connection on system A goes into TIME_WAIT
then eventually disappear. System B can then succesfully mount the
filesystem and finish the boot sequence. However, it can sometimes take 30
minutes for this to happen.

I'm pretty sure this didn't happen in the past, but I can't pinpoint which
patch caused this behavior.

Attached is a small part of a snoop done on System A (system A is
'server1', system B is 'castlerock')

Has anybody seen this behavior ?

Oh, if the client is a Linux machine, we observe the same problem.

--
Christophe Dupre
System Administrator, Scientific Computation Research Center
Rensselaer Polytechnic Institute
Troy, NY USA
Phone: (518) 276-2578 - Fax: (518) 276-4886

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