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Re: [K12OSN] Re: [Ltsp-discuss] New LTSP + openMosix How-To



--- Stephen Liu <satimis writeme com> wrote:
> On Sat, 2002-10-26 at 21:41, John McCreesh wrote:
> > If your single server is running out of capacity, one way to expand is
> > to add additional servers and build an openMosix cluster. 
> 
> I assume it is not referring to the capacity of hard drive.

Correct.

> > For
> > example, if you work in an organisation that is throwing away PIII
> 600MHz
> > PCs with 256Mb RAM because they are 'too slow' for Windows XP, then you
> > can grab them from the rubbish bin and build them into a cluster.
> 
> 1) Is openMosix for Linux or for Windows or both
> 2) Is it to add those aged PCs to the network and build them into a
> cluster.

openMosix is a kernel patch for Linux.  Windows only wishes they could do
this kind of clustering ;-)  You can any PC to the cluster, but they all
must use the same version of the openMosix kernel (i.e. you cannot mix
2.4.17 om machines with 2.4.18.  They all need to be on the same page.)

> > The advantages of openMosix are said to be you can add and remove
> > servers from the cluster without interrupting service to users; the
> > cluster load balances automatically; 
> 
> Sorry I am a little lost.  If several servers are grouped together in a
> server farm to increase the operation power with all their CPU resources
> how can a server be removed without interrupting the service to users
> while in operation, particularly the data stored in its hard disk. 
> Should I be wrong, please correct me.

I believe that I read a post from Moshe where he explained that the system
that migrated the process keeps track (if you will) of what's going on, so
if the box that has one of it's migrated processes drops out things don't
"break".  I am going to research that futher.  If I can find the post I
will let you know.  Of course, I may be wrong here...


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