RE: clustering

Eeeew. And people don't like VMS clustering why??? <insert subjective argument here> DEC had this nailed down *decades* (plural) ago -- with all nodes in the cluster active voting members (read: all servers in cluster by default are available) in the quorum. The major downside is that failover in the DB falls to the application, or is it to the DB in the case of Oracle Failsafe?

Pardon my rant, but what passes for a "cluster" these days seems to be several large steps back from a VMS cluster, save for RAC. By no coincidence, RAC comes from the clustering ability of the former DEC's product, I believe.

Then again, I've had *way* too much Indian black tea today... :)

Rich Jesse                           System/Database Administrator
rjesse_at_qtiworld.com                  Quad/Tech Inc, Sussex, WI USA

> -----Original Message-----
> From: Matthew Zito [mailto:mzito_at_gridapp.com]
> Sent: Monday, July 28, 2003 12:05 PM
> To: Multiple recipients of list ORACLE-L
> Subject: RE: clustering
>
>
>
> 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_at_gridapp.com
> Cell: 646-220-3551
> Phone: 212-358-8211 x 359
> http://www.gridapp.com
>
> > -----Original Message-----
> > From: ml-errors_at_fatcity.com [mailto:ml-errors_at_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_at_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_at_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_at_galottery.org
> > >
> > > Fat City Network Services -- 858-538-5051

-- 
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Author: Jesse, Rich
  INET: Rich.Jesse_at_qtiworld.com

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