*BSD News Article 90149


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From: "J. Zhu" <jyzhu@usa.net>
Newsgroups: comp.unix.bsd.bsdi.misc
Subject: Help: Crash with NFS server!
Date: Mon, 03 Mar 1997 23:44:23 -0600
Organization: USA Inc.
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Hi there, We have a SunOS 4.1.3_U1 computer running under the NIS 
environment. The machine is configured as both NFS server and client,
i.e it exports some of its file systems to the network and also can
access other NFS file servers. Automount and ypbind are run on it. It
has two network cards, an ether card called demo-e and a FDDI card 
called demo.

The bad thing is that the machine has kept crashing a couple of times in
the last 10 days. The following messages were seen from the system
console.

Feb 24 16:13:16 demo vmunix: NFS server samson not responding 
still trying
Feb 24 16:13:16 demo vmunix: NFS server samson ok
Feb 24 16:13:43 demo vmunix: NFS server samson not responding still
trying
Feb 24 16:13:43 demo vmunix: NFS server samson ok
Feb 24 16:14:29 demo vmunix: NFS server samson not responding still
trying
Feb 24 16:14:29 demo vmunix: NFS server samson ok
Feb 24 16:14:56 demo vmunix: NFS server samson not responding still
trying
Feb 24 16:14:56 demo vmunix: NFS server samson ok
Feb 24 16:16:43 demo vmunix: NFS server samson not responding still
trying
Feb 24 16:16:53 demo vmunix: NFS server atlas not responding still
trying

For your information, the following are the contents of /etc/mtab 
for demo machine:
 
/dev/sd0a / 4.2 rw,dev=0700 1 1
/dev/sd0g /usr 4.2 rw,dev=0706 1 2
/dev/sd2g /local/demo 4.2 rw,dev=0716 1 3
/dev/sd1g /local/demo1 4.2 rw,dev=070e 1 4
demo:(pid124) /home ignore
ro,intr,port=724,map=auto.home,indirect,dev=8200 0 0
demo:(pid124) /net ignore ro,intr,port=724,map=-hosts,indirect,dev=8201
0 0
demo:(pid124) /u ignore ro,intr,port=724,map=auto.u,indirect,dev=8202 0
0
demo:(pid124) /t ignore ro,intr,port=724,map=auto.t,indirect,dev=8203 0
0
demo:(pid124) /d ignore ro,intr,port=724,map=auto.d,indirect,dev=8204 0
0
atlas:/vtool/cadappl.sunos /tmp_mnt/t/cadappl_sunos nfs rw,dev=8205 0 0
samson:/local/samson1/sun.usr.local /tmp_mnt/t/sunusrlocal_samson nfs
rw,dev=820
7 0 0
atlas:/vtool/cadence/9403 /tmp_mnt/t/cds9403 nfs rw,dev=8208 0 0
tapeboy:/nsr /tmp_mnt/t/networker nfs rw,soft,intr,suid,dev=820a 0 0
 
We have other SunOS 4.1.3_U1 machines with the same configuration as the
crashed mechine. They use same NFS file systems but work just fine.
Supposedly, the machine should not be down even if it has hard time to
talk to NFS file servers. The machine still crashed even after we
replace the ether network card with a brand new one because we first
suspect the problem might be from the card. After using nfsstat and
netstat commands, we found nothing wrong from the reports. Another weird
thing is that the machine always crashed around 4-5pm. Checking the cron
in the machine, nothing special is going between 4-5pm. 
 
Any clues and suggestion about the problem will be greatly appreciated.

Johnny
Emailto:jyzhu@blue.weeg.uiowa.edu