[Linuxha-users] OpenMosix

[Curtis_J]

I had setup a 2 server configuration.  Each server had 2 harddrives --
On the first harddrive I installed the operating system, and  qmail and
samba.  The second harddrive I created 2 drbd partitions.  
On drbd partition 1 I copied the qmail files and created the relevant
softlinks.
On drbd partition 2 I did the same for samba.

Server 1 was setup to be the preferred server for qmail and server 2
samba
So when both servers were running -- each mounted one partition on the
second drive. Server 1 had a floating ip for mail and server2 one for
samba.

When one server failed the other ran both services and mounted both drbd
drives and both floating ip addresses.
When the server was brought back up it took back the service it was
supposed to run automatically.

This was a high available setup that did loadbalancing. (to a degree)

Right now I'm trying to setup a similar situation -- but where the
servers also run openmosix -- that way they can automatically distribute
processing to the server that is least utilized.  For instance if the
mail server was hammered with antivirus processing the samba server
could lend a hand.

With openmosix you can have other servers (example backup or network
monitoring server...) also participate in openmosix.  So they could
create a virtual supercomputer where critical apps are highly redundant.

Other computers (linux desktops) could be setup with openmosix to
further boost the performance.

Curtis




-----Original Message-----
From: Simon Edwards [mailto:simon.edwards at linuxha.net] 
Sent: Thursday, December 15, 2005 7:01 PM
To: Michael Mansour
Cc: cjunevicus at federatedcomputers.com; Linuxha.net Users Mailing List
Subject: Re: [Linuxha-users] OpenMosix

Hi Curtis,
	Thanks for the email. Getting linuxha.net to work more easily is
my
number one aim at present (and will be for V2 which is in the early
prototype stage).

	I must concur with Michael on this one ... by load balancing you
are
talking about processes migrating between nodes - but DRBD only allows a
single node write access to any particular file system ... so the two do
not really marry well.

	What you really need is a clustered file system rather than a
replicated one - GFS for example - but these rely on dual-attached
SCSI/iSCSI/Fibre Channel storage and have a single point of failure -
the storage in question!
	
	One avenue I intend to explore in the new year however is Xen3
and
linuxha.net - it might be possible to move virtual cluster nodes between
machines - though the IP configurations might be the only sticking point
- I need to investigate more and see. If moving cluster nodes does work
- then you could implement load balancing to move nodes - where each
node is running a single application.  Of course not as fine-grained as
OpenMosix but still might be useful.

Regards,
Simon.

	

On Fri, 2005-12-16 at 07:58 +1000, Michael Mansour wrote:
> Hi Curtis,
> 
> > I've setup a drbd cluster in the past -- we were clustering samba 
> > and a qmail installation and getting it all working initially was a 
> > bear, but once we had it running it was great.
> > 
> > The work that you've done has made this so much easier and the
> > documentation is fantastic.
> > Kudos..
> > 
> > I would like to setup a combination of OpenMosix and linuxha 
> > cluster.. to get the benefits of high availability and process load
balancing.
> > 
> > I was wondering if anyone has had successful experience getting both
> > working --drbd and openmosix.
> > 
> > I've noticed there is a version of openmosix that has been setup on
centos4
> > http://openmosix.eng.ua.edu  .. and I might give it a try.
> > 
> > Any suggestions or recommendations would be welcomed.
> 
> I'd like to advise but I'm interested to know exactly what you're
looking for
> (or trying to do) with your cluster software. 
> 
> linuxha.net is software which allows you to have HA failover between
two
> nodes, using floating IPs and drbd as the shared storage device.
OpenMosix is
> specifically for SSI.
> 
> With a combination of these two? I'm trying to understand your
application
> and/or requirement.
> 
> Michael.
> 
> 
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