[Linux-cluster] Re: pool and LVM, and changes since 2000

[Ed L Cashin]

Thanks for the info.

Michael Conrad Tadpol Tilstra <mtilstra at redhat.com> writes:

> On Wed, Oct 06, 2004 at 10:36:41AM -0400, Ed L Cashin wrote:
>>   The memexp locking module that was new at the time of the 2000 OLS
>>   talk was designed to use RAM exported by fancy storage hardware for
>>   coordinating locking.  A single node could stand in, though, taking
>>   the place of the fancy RAM-exporting storage hardware.  Today, most
>>   GFS installations use DLM instead.
>
> Almost.  Most gfs installations today use gulm, which is a fail-over
> equiped lock server.  We have a DLM that will be available later.
> (usable now from cvs if you want.)

...
[regarding node death tracking]
> A cluster manager takes care of this now.  The core portion of gulm
> tracks membership of the cluter.  For the DLM, we have a cluster manager
> named cman.

Will DLM + cman make GULM unnecessary?  Or will we still have GULM
when DLM and cman are in widespread use?  If so, what will its role
then be?

-- 
  Ed L Cashin <ecashin at coraid.com>