I have found that clustering for fail over reasons is
very easy with Firebird but does take both time and
money. The easiest way to go about it is to use a
program from Veritas called veritas cluster server
(VCS). The program basically watches a process using
any number of different scripts testing for things
such as the process being present network
connectivity. Once VCS detects a problem with the
primary server it attempts to shutdown the active
process and handover the virtual IP address of the
service to the fail over system. Once the process has
been shutdown the LUN is umounted from the primary
server and mounted on the fail over server. The last
thing it does is start the process on the fail over
server in our case a Firebird classic server. All and
all the fail over takes anywhere from 1 to 2 minutes.

Thanks,

James Gill
--- Phil Shrimpton <phil@...> wrote:

> On Monday 28 June 2004 18:41, Ann W. Harrison wrote:
>
> Hi,
>
> > Out of curiosity, why are you interested in a
> clustering
> > solution rather than a multi-processor w/ high
> performance
> > disks?
>
> I am not the original poster, but as most of our
> customers are moving
> to/insiding on a clustered environment, I will give
> their reasons. Those
> being failover and load balancing, with performance
> being lower down the list
> (in fact they are happier with a lower performance
> in exchange for
> failover/balancing). A mutilprocessor machine with
> fast disks only gives you
> performance, and not the other two.
>
> When clustering has come up on the lists before, the
> general responce
> (including Jim's) has been "throw more hardware at
> it", but performance is
> generally not the issue looking to be solved when
> people want a clustering
> solution.
>
> Phil
> --
> Discover a lost art - play
> Marbles
> May 2004
>
> www.marillion.com
> ICQ: 760757 | AIM: pjshrimpton | Y!: pjshrimpton |
> pjshrimpton@...
>
>
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