[CentOS] Exporting /dev/shm as NFS share?

[John Hodrien]

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