Re: cluster unaware custom application

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Hi Edwin,

thank you very much for your information. I helped me a lot to clearify what
happens on a fail over.
There came a few more to my mind:
- How long does a "fail over" usually take?
(I am aware, that I will have to add my applications startup time to
that.)
- Are there any reasons, why a application in a cluster should NOT be a .NET
application?
(My plans are to redesign the production control as a .NET application)

Regards
Rainer

"Edwin vMierlo" <EdwinvMierlo@xxxxxxxxxxxxxxxxxxxxxxxxx> schrieb im
Newsbeitrag news:ew8CfBA3GHA.476@xxxxxxxxxxxxxxxxxxxxxxx
Rainer,

if an application in a cluster "fails over" to another node, all in memory
is lost.
an application in a cluster must write data to a shared disk to maintain
information.

Once an application is "comming online" on the other node it can read (you
need to program this to happen in your application) the data from disk
again.

Also, please be aware that during the actual failover process there is a
moment where your application is not running (its being failed over)
Also, once online on the surviving node, you need you clients to
re-connect
to this application or this application need to connect to the clients
(again this need to be programmed in the application)

I realise this answer is quiet generic, but I hope it answers your
questions
rgds,
Edwin.


"Rainer Queck" <Rainer@xxxxxxxxxxxxxxx> wrote in message
news:eN1Sq6$2GHA.5032@xxxxxxxxxxxxxxxxxxxxxxx
Hello NG,

I am collecting information on clustering and what it can do for me.
Background is, that we have a "cluster unaware" application for which we
need a hi availabillity.

I red "BDMTDM.doc" which gave me an rough overlook an what Windows Server
2003 serverclustering can do. But I still have a few more question on the
subject.

I would like to bring to my mind what happesn on a node failure to my
application?
Is it that a other node takes over with out any losses at all (process
memory)?
My application is a production control, comunicating with (PLC-) clients
via
UDP datagrams and there fore has a "production-status" in its memory. How
can (if at all) be a other node able to have the same application runing
with the same "production-status" ?

Any information, hints and comments to these questions are very
appreciated.

Regards
Rainer Queck






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