[rhn-users] RHEL3 ES- NFSSVC_MAXBLKSIZE

[Raj Kumar]

I found some ways to verify answers myself. I'm posting it in the hope it will be useful to others:

If the server doesn't support TCP, the mount command from client fails.

mount -o tcp hostname:/mnt/dir /mnt/dir1

this will fail with an error message.
  
Some versions of the kernel doesn't have the support for NFS over TCP compiled into the kernel. Support can be added by custom building a kernel. I used "make xconfig" to edit the configuration file used to build the kernel. In the main menu choose File systems, then Network File Systems and then select "y" for the option "Provide NFS server over TCP support (Experimental)" 

After building the kernel, issue mount -o tcp from NFS client to use NFS over tcp. To verify if the client is indeed using TCP check the /proc file system.

cat /proc/nfsd-pid/mounts

to find nfsd-pid:
ps -aux | grep nfsd

Hope this helps!
Raj  


On Wed, 05 Jan 2005 Raj  Kumar wrote :
>Another question: How do I verify if the NFS server and client support NFS over TCP. Output from rpcinfo -p localhost:
>
>    100003    2   udp   2049  nfs
>     100003    3   udp   2049  nfs
>     100003    2   tcp   2049  nfs
>     100003    3   tcp   2049  nfs
>
>does this mean that nfs supports ver2,3 and tcp,udp? Is there an easy tweak to make both NFS server and client use ver3 over TCP. I can specify vers=3,tcp in /etc/fstab to make NFS client use that protocol. Is that all I have to do?
>
>Thanks for your guidance!
>Raj
>
>On Wed, 05 Jan 2005 Vinodh Cuppu wrote :
> >On 01/04/2005 10:38 PM, Raj Kumar wrote:
> >
> >>What changes have to be made to enable 32K rsize/wsize for both NFS Server and Client?
> >>
> >>with only this change made
> >>to the file /usr/src/linux-2.4/include/linux/nfsd/const.h:
> >>
> >>NFSSVC_MAXBLKSIZE = 32*1024 (instead of 8*1024)
> >>
> >>and compiling kernel suffice?
> >>
> >>Does both NFS server and client support 32k rsize/wsize or only NFS client?
> >>
> >Add "rsize=32768,wsize=32786" to the options portion of the mount in /etc/fstab, like the following
> >
> >machine:/export_dir  /nfs_mount                  nfs     other_options,rsize=32768,wsize=32786           0 0
> >
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