RE: Using two boxes to share the load via ddm files

[Evan Harris <spanner@xxxxxxxxxx>]

Hi Rick

Nathan's point about an additional point of failure is a good one. If 
possible applications using the DDM files should be coded on the 
basis that the file might not be there, probably via a user open or 
something similar.

You want to avoid a scenario where using DDM creates an additional 
dependency such that each time a machine needs to off-line e.g. for 
backups or maintenance it affects other machines that might be 
requesting data and applications start failing with "File not Found" 
or similar messages.

I would also avoid the Anynet connectivity option if possible - this 
can require a bit of work of an administrative nature when converting 
so you may as well set them up as IP in the first place, at it is 
likely to be more long-lived than SNA.

regards
Evan Harris

At 08:51 a.m. 5/12/2006, you wrote:

> Thanks Michael and Nathan!
>
>         That gives me food for thought.  Is there a difference in the
> performance impact on the machines depending on their role?  That is if Box
> A accesses DataBase files on Box B with ddm, what would be the impact on Box
> B compared to the impact of running the data access locally?  Does that make
> sense? <smile>  I'm still cogitating about this - it has many ups and
> downs...
>
> Regards,
>
> Rick DuVall
> Systems Manager
> Dealer's Auto Auction of Okc
> 1028 S. Portland
> Oklahoma City, OK 73108
> (405) 947-2886
> rick@xxxxxxxxxx
> http://www.nothingisreal.com/dfki/no-word