Re: [ogfs-dev]EVMS/OGFS/CM ?

[Steven Dake <sdake@mvista.com>]

> One good solution may be to decide that we are going to work with kernel
> space cluster manager and come up with a driver for heartbeat to work
> with so that any heartbeat event will be converted into a kernel event
> by this driver.Now ogfs will register for cluster events from this
> driver and this driver will be different for different cluster
> manager.In case of openssi this dirver will nothing but a wrapper for
> the existing  openssi functionalities. 
>  
A user space cluster manager is simpler to implement, although it may be 
more challenging for OpenGFS to make use of the software.  It is 
possible to make a kernel interface to a user space cluster manager and 
much simpler then implementing a cluster manager entirely in the 
kernel.  Implementing a cluster manager in the kernel is likely to be 
complex, fraught with bugs, and much more difficult to debug then user 
code.  Finally, implementing a fullblown cluster manager in the kernel 
is likely to be rejected by the kernel community for acceptance into any 
mainline kernels for the forseeable future.

We do want OpenGFS accepted into the mainline...

> One more advantage could be that this driver can be re used for other
> kernel  cluster subsystem( like openDLM ) that depend on heartbeat for
> membership information. 
>
>
> Once the interfaces exposed by the driver are freezed ogfs team can
> release a sample implementation of this driver which is dependent on
> heartbeat and other team can implement the driver for their cluster
> manager. Regarding APIs once could follow the  interface used by
> openssi( because that code has been tested in the form of SCO NSC
> cluster). And should sufficiently meet all the membership requirement.
> If there any specification as a part of OCF/SAF that mention about these
> kind of APIs following those APIs will be better IMO. 
>
>
> -aneesh 
>
>
>
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