[Lustre-discuss] NFS vs Lustre

[Daniel Kobras]

Hi!

On Sat, Aug 29, 2009 at 11:56:40AM -0600, Lee Ward wrote:
> NFS4 addresses those by:
> 
> 1) Introducing state. Can do full POSIX now without the lock servers.
> Lots of resiliency mechanisms introduced to offset the downside of this,
> too.

NFS4 implementations are able to handle Posix advisory locks, but unlike
Lustre, they don't support full Posix filesystem semantics. For example, NFS4
still follows the traditional NFS close-to-open cache consistency model whereas
with Lustre, individual write()s are atomic and become immediately visible to
all clients.

Regards,

Daniel.