CTDB - the 'Mainz' plan for clustered Samba

[Aleksey Fedoseev]

>  > Is this a UDP or TCP transport?
> 
> Deliberately not specified :)
> 
> On GPFS we will probably be using a low level hardware messaging
> transport, aiming for maybe 2-5 usec latency. On gigabit you could use
> either TCP or UDP. I haven't yet specified if the transport needs to
> be reliable or not. I would like it to support unreliable transports,
> but I need to work through all the possible messages that could be
> lost and see how well that will work.
> 
> I will be prototyping this with either TCP or UDP, or possibly even
> MPI, but I expect to allow people to plug in other transports.

As I understand, you're planning to use the same interaction/transport
layer as common Samba messaging? Or not? This means that all CTDB calls
have to be synchronous. And the messaging subsystem has to be modified
significantly.

And will CTDB calls replace TDB in locking.c/brlock.c implementation (as
we did in vl-messaging branch)?

-- 
Aleksey Fedoseev
Linux Center of Competence, IBM EE/A
IBM Linux Technology Center: Samba Team
Phone: +7495 775-8800 x 2133