From: Nitin Chandrachoodan <nitin@tenet.res.in>
Subject: remount error: 'unknown nfs mount option: v3'
Date: Mon, 28 Jul 2003 12:06:40 +0530
Sender: nfs-admin@lists.sourceforge.net
Message-ID: <20030728063639.GD2204@tenet.res.in>
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To: nfs@lists.sourceforge.net
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Hello,

We have a diskless client setup in our lab, with / and /usr
mounted from a server. The server is running a standard RedHat
8.0 distrib, and the clients have a standard (except for
recompiled kernel) RedHat 9.0. nfs-utils, mount etc. are the
standard versions out of the box.

The /etc/exports on the server contains

/tftpboot           192.168.15.0/24(rw,sync,no_root_squash)
/home1/remoteusr    192.168.15.0/24(rw,sync,no_root_squash)

The root fs is mounted by the kernel option to pxelinux given by 
  DEFAULT linux
  LABEL   linux
          KERNEL bzImage.wks
          APPEND panic=5 nfsroot=192.168.15.1:/tftpboot
          IPAPPEND 1

The /usr is mounted in rc.sysinit using 
action $"Mounting /usr partition" mount 192.168.15.1:/home1/remoteusr /usr -t nfs -o ro,nolock

So far so good, it boots up, and runs normally. 

The problem arises when I try to remount the / and /usr as
read-write (to install software on the client). When I try 
  mount -n -o remount,rw /
  mount -n -o remount,rw /usr

the second mount fails with "unknown nfs mount option: v3".

I noticed that typing 'mount' after bootup shows
  /dev/root on / type nfs (ro,v2,rsize=4096,wsize=4096,hard,udp,nolock,addr=192.168.15.1)
  192.168.15.1:/home1/remoteusr on /usr type nfs (ro,v3,rsize=4096,wsize=4096,hard,udp,nolock,addr=192.168.15.1)

The /etc/fstab does not contain any of the entries, and
/etc/mtab is linked to /proc/mounts.

It seems that the 'v3' showing up in the mount listing is
causing the problem. I dont know why it is there, and why the /
got mounted as v2, I did not specify those options anywhere.

How are default options passed to the NFS systems? Are they
compiled into the kernel? When I try mounting these same
filesystems from another RH9 machine that is not diskless, it
works fine, and mount shows 
  nfs:/home1/remoteusr on /mnt/hdd type nfs (rw,addr=192.168.15.1)

Any suggestions would be greatly appreciated.

Thanks in advance,

Nitin


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