[Info-vax] New filesystem mentioned

[Kerry Main]

> -----Original Message-----
> From: Info-vax <info-vax-bounces at rbnsn.com> On Behalf Of Grant Taylor
> via Info-vax
> Sent: May 14, 2019 11:13 PM
> To: info-vax at rbnsn.com
> Cc: Grant Taylor <gtaylor at tnetconsulting.net>
> Subject: Re: [Info-vax] New filesystem mentioned
> 
> On 5/14/19 9:36 AM, Dave Froble wrote:
> > Perhaps because no other OS (well, almost all) has a DLM.  At least
> > that I'm aware of.
> 
> Linux has a distributed lock manager in kernel for the GFS2 file system.
> 
> I strongly suspect that Oracle's OCFS as well as ACFS both have
> (different) DLMs.
> 
> Veritas has it's Group Lock Manager that performs what I understand a DLM
> to do.
> 
> IBM's GPFS has a distributed lock manager.
> 
> I would be surprised to see any type of cluster that had shared access to
> disks that didn't have a DLM.
> 
> Apparently Microsoft's Cluster Server does not provide shared access to
> things and is instead exclusively single access.  Thus there is no need for a
> DLM.  Or so I quickly read.
> 
> 

The question is really what type of cluster strategy is being discussed?

There are two basic cluster models - shared-nothing (App level locking) or Shared-disk (aka shared everything using a DLM).

There are pro's and con's with each model.

Shared disk (everything) includes not only OpenVMS, but also Linux/GFS2, z/OS. 
<https://en.wikipedia.org/wiki/GFS2>

Shared nothing cluster models include *nix, Windows, NonStop and since this model uses App level clustering, one could argue you "could" deploy OpenVMS in a shared nothing cluster model as well.

A good whitepaper which discusses pros and con's of the two basic cluster models can be found here:
<http://www.benstopford.com/2009/11/24/understanding-the-shared-nothing-architecture/>


Regards,

Kerry Main
Kerry dot main at starkgaming dot com