Message-ID: <F001.005C77E6.20030728090431@fatcity.com>
Date: Mon, 28 Jul 2003 09:04:31 -0800
To: Multiple recipients of list ORACLE-L <ORACLE-L@fatcity.com>
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From: "Matthew Zito" <mzito@gridapp.com>
Subject: RE: clustering
Organization: Fat City Network Services, San Diego, California
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Normally the process is very inelegant.  The filesystems are mounted on
the passive node (and unmounted from the primary node if the OS is still
up), oracle is started up, any listener IP addresses are failed over,
and then the listener is started (not necessarily in that order).  

With active/passive clustering there's rarely anything very crafty in
terms of service migration, etc.  Anything that was running on the
failed node is shutdown on the failed node if its still running and then
started on the standby node.  The elegance appears in terms of
determining when a node is down, preventing "split-brain" syndrome (when
both sides of the cluster decide to become active at once), etc.  That's
the hard part of clustering.  The actual service migration is pretty
trivial.

Matt

--
Matthew Zito
GridApp Systems
Email: mzito@gridapp.com
Cell: 646-220-3551
Phone: 212-358-8211 x 359
http://www.gridapp.com

> -----Original Message-----
> From: ml-errors@fatcity.com [mailto:ml-errors@fatcity.com] On 
> Behalf Of AK
> Sent: Monday, July 28, 2003 12:50 PM
> To: Multiple recipients of list ORACLE-L
> Subject: Re: clustering
> 
> 
> so what happens when  first node goes down , oracle instance 
> (processes ) will start on other node ? OS will take care of 
> everything ?
> 
> -ak
> 
> 
> ----- Original Message ----- 
> To: "Multiple recipients of list ORACLE-L" <ORACLE-L@fatcity.com>
> Sent: Monday, July 28, 2003 9:29 AM
> 
> 
> > ak,
> >  As I understand it, an HP cluster is 2 boxes that have the 
> capability 
> > to access the same disks and data but only one can have the oracle 
> > instance running and accessing the datafiles(active). Sort 
> of like a 
> > high availability option. With RAC both boxes can access 
> the instance 
> > and datafiles at the same time.
> > List, Correct me if I need it.
> > Ron
> >
> > >>> oramagic@hotmail.com 07/28/03 12:14PM >>>
> > Hi Guys ,
> > I am new to this clustering concept. Just trying to understand few 
> > basics . Need ur help .
> >
> > what is differece between oracle running on sun /hp cluster with 2 
> > nodes and oracle with RAC running on 2 nodes ?
> >
> > thanks,
> > -ak
> > --
> > Please see the official ORACLE-L FAQ: http://www.orafaq.net
> > -- 
> > Author: Ron Rogers
> >   INET: RROGERS@galottery.org
> >
> > Fat City Network Services    -- 858-538-5051 http://www.fatcity.com
> > San Diego, California        -- Mailing list and web 
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> Please see the official ORACLE-L FAQ: http://www.orafaq.net
> -- 
> Author: AK
>   INET: oramagic@hotmail.com
> 
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-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.net
-- 
Author: Matthew Zito
  INET: mzito@gridapp.com

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