[gentoo-user] nfs mount on client end.

[Harry Putnam <reader@newsguy.com>]

In my home lan setup its an opensolaris (zfs fs) NFS server that is
supposed to be set to show NFS vers=3 on offer.

Somehow on the client end... my gentoo desktop, its getting mounted
with vers=4 as evidenced by the output of `mount'

opensolairs_NFS_SERVER:/pub on /pub type nfs 
   (rw,users,addr=192.168.0.29,vers=4,clientaddr=192.168.0.2) 

Note it says vers=4.  I don't see where that is being set.

/etc/conf.d/nfs mentiones NFS vers=4 but doesn't say that is what its
telling the kernel to use.

  From /etc/conf.d/nfs
  # Optional services to include in default `/etc/init.d/nfs start`
  # For NFSv4 users, you'll want to add "rpc.idmapd" here.
  NFS_NEEDED_SERVICES="rpc.idmapd"

Does that determine what version gets used... it doesn't sound like it
would. 

These lines out of /etc/init.d/nfsmount seems to be the culprit:
   # Make sure nfs support is loaded in the kernel #64709
   if [ -e /proc/modules ] && ! grep -qs 'nfs$' /proc/filesystems ; then
      modprobe -q nfs
   fi

   ebegin "Mounting NFS filesystems"
   mount -a -t nfs,nfs4
   eend $?

Or does `mount -a -t nfs,nfs4'  just mean vers 4 is made available?

I have 2,3 and 4 enabled in the kernel:

zcat /proc/config.gz |grep 'NFS[^D].*='

  CONFIG_NFS_FS=y
  CONFIG_NFS_V3=y
  CONFIG_NFS_V3_ACL=y
  CONFIG_NFS_V4=y
  CONFIG_NFS_ACL_SUPPORT=y
  CONFIG_NFS_COMMON=y

There is also a:
 # CONFIG_NFS_V4_1 is not set
But I think that is experimental, and not necessary for vers=4 to be
available. 

So is the linux client supposed to decide which version to mount by
what it sees on offer?

If so, then is there a known problem when the server is opensolaris?

I know opensolaris people tell me to set the server to offer only
version=3 because there is some problem with linux if you use
version=4.

On the opensolaris lists, I've been discussing this, and it appears
other users  are not having a similar problem when they tell the
server to use version=3 which I have (on the opensolaris server in 
 /etc/default/nfs):

 # Sets the maximum version of the NFS protocol that will be used by
 # the NFS client.  Can be overridden by the "vers=" NFS mount option.
 # If "vers=" is not specified for an NFS mount, this is the version
 # that will be attempted first.  The default is 4.
 #NFS_CLIENT_VERSMAX=4

 # [HP 03/12/09 00:20  
 NFS_CLIENT_VERSMAX=3
 # ]

-------        ---------       ---=---       ---------      -------- 

Any input would be helpful..