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  3. December 2006

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

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

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