What is a multi homed machine?
Parikshit
----- Original Message -----
From: Evan Ireland <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Friday, July 21, 2000 4:43 AM
Subject: Re: Clustering and fail-over (was RE: EJB Inheritance,polymorphism
and generic code)
Frank Sauer wrote:
>
> The need for a multi-homed machine is a weblogic clustering PROBLEM.
> Apparently they want you to buy large numbers of small machines or
> equip larger machines with dozens of NICs to make things scale. IMHO this
> doesn't work very well...
>
> Gemstone can do clustering on any machine you want, utilizing
> large multi-cpu enterprise servers to their full capacity. Of
> course clusters can use multiple of those beasts as well.
<vendor>
The same applies for Sybase EAServer, which adds powerful Repository
synchronization and cluster versioning options to simplify large-scale
deployment.
</vendor>
> I'd rather buy one, two or perhaps three large enterprise servers and be
> done with it then a whole farms of smaller machines just because one of my
> software vendors has a strange idea about clustering...
>
> Frank Sauer
> The Technical Resource Connection
> Tampa, FL
> http://www.trcinc.com
>
> > -----Original Message-----
> > From: A mailing list for Enterprise JavaBeans development
> > [mailto:[EMAIL PROTECTED]]On Behalf Of Cedric Beust
> > Sent: Thursday, July 20, 2000 4:53 PM
> > To: [EMAIL PROTECTED]
> > Subject: Clustering and fail-over (was RE: EJB Inheritance,
> > polymorphism
> > and generic code)
> >
> >
> > [changed the topic]
> >
> > > From: A mailing list for Enterprise JavaBeans development
> >
> > > Reading the messages on clustering and fail-over is very
> > interesting. One
> > > simple, or maybe not question, how do you test a clustered
> > system to make
> > > sure fail over really works?
> >
> > There are several techniques. From a developer's perspective, I have a
> > multi-homed machine, allowing me to run several nodes in the
> > cluster on a
> > single machine. It makes it easier to debug (although you can also use
> > separate machines and resort to VNC or VMWare, but that's
> > more awkward).
> >
> > From an automated (testing and QA) point of view, you can
> > fire the cluster,
> > start the subsystems you want to test, kill some randomly
> > chosen victims (VM
> > exit) and make sure the operations were carried out correctly
> > (or that they
> > threw the right exceptions).
> >
> > --
> > Cedric
> >
> > ==============================================================
> > =============
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> >
>
>
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--
____________________________________________________________________________
____
Evan Ireland Sybase EAServer Engineering
[EMAIL PROTECTED]
Wellington, New Zealand +64 4
934-5856
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