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Thread Hardware replication and DBISAM
Wed, Apr 4 2007 8:45 AMPermanent Link

"Jose Eduardo Helminsky"
Tim

One of my customer is starting to implement a hardware replication (two
servers, same manufactor, same model, same features). The application is
running in C/S mode (4.22 build 4)

My doubts:
1) Do I have to install DBSRVR on both servers ?
2) What about the performance ?
3) Do I have to deal with different issues when programming ?

Eduardo

Wed, Apr 4 2007 5:43 PMPermanent Link

Tim Young [Elevate Software]

Elevate Software, Inc.

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Email timyoung@elevatesoft.com

Eduardo,

<< One of my customer is starting to implement a hardware replication (two
servers, same manufactor, same model, same features). The application is
running in C/S mode (4.22 build 4)

My doubts:
1) Do I have to install DBSRVR on both servers ? >>

Well, if you want to simply switch over to the new server immediately and
have everything keep on running, then yes, it will need to be installed on
both.

<< 2) What about the performance ? >>

The only performance issue that I can see is how fast they can replicate the
data over from one server to the other.  How do they intend to do so ?  Are
they using a hot-backup software package on the servers ?

--
Tim Young
Elevate Software
www.elevatesoft.com

Thu, Apr 5 2007 3:53 PMPermanent Link

"Ralf Mimoun"
Jose Eduardo Helminsky wrote:
> Tim
>
> One of my customer is starting to implement a hardware replication
> (two servers, same manufactor, same model, same features). The
> application is running in C/S mode (4.22 build 4)
>
> My doubts:
> 1) Do I have to install DBSRVR on both servers ?
> 2) What about the performance ?
> 3) Do I have to deal with different issues when programming ?

That all depends on the replication system the customer will use. Some
systems simply mirror everything to the backup system. Both will be in
exactly the same state all of the time until one system goes down. Normally,
the servers have dedicated network cards for that, high speed etc. In such a
scenario, the "normal" software running on such a system does not have to
know anything about that replication. It will be replicated, too.

Ralf
Thu, Apr 5 2007 5:06 PMPermanent Link

"Jose Eduardo Helminsky"
Tim and Ralf

Thank you for both.

Eduardo

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