CentOS - Jun 2011 - Exporting /dev/shm as NFS share?

I'm trying to do some network transfer test using NFS. The problem is
when I try to eliminate the possibility of the hard disks being the
bottleneck. I am unable to export /dev/shm as a NFS share. Initially
there was an error about fsid or wrong filesystem.

If I use a symbolic such as /home/test -> /dev/shm, on the remote
system, this causes the NFS client to see its own /dev/shm

If I mount /home/test as a tmpfs on the host and export it, the client
also appear to use its own tmpfs rather than the host.

Is there anyway to work around this or some other way to test the
network speed without being bottlenecked by the sending side?

On Fri, 24 Jun 2011, Emmanuel Noobadmin wrote:
> I'm trying to do some network transfer test using NFS. The problem is
> when I try to eliminate the possibility of the hard disks being the
> bottleneck. I am unable to export /dev/shm as a NFS share. Initially
> there was an error about fsid or wrong filesystem.
>
> If I use a symbolic such as /home/test -> /dev/shm, on the remote
> system, this causes the NFS client to see its own /dev/shm
>
> If I mount /home/test as a tmpfs on the host and export it, the client
> also appear to use its own tmpfs rather than the host.
>
> Is there anyway to work around this or some other way to test the
> network speed without being bottlenecked by the sending side?
/dev/shm's how I would do it.

Make a file on /dev/shm and the format it, mount it, export it.

dd if=/dev/zero of=/dev/shm/export bs=1M count=1000
mke2fs -j /dev/shm/export
mount -o loop /dev/shm/export /mnt/foo

Then export /mnt/foo

That do?

jh