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Message Posted: Mon, 09 Jul 2001 @ 20:38:55 GMT

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Subj:   Re: Disaster Recovery for Teradata
From:   David Wellman

Hi Patricia,

A number of the UK customer sites have contracted with a third-party company to have a DR capability. A few that I know of do it in- house by using a second system.

If that sounds expensive, it is, but don't be too disheartened.

In both these customer sites the second box is continually in use. One site uses it as a development/user testing system, and like the example in Christopher Platt's email it is smaller than the production box, so they have to choose what data is covered by DR. That decision is made by the business users (who are paying for it all !).

The second customer site that I'm thinking of migrated to a new production box and kept their old one. They have two full-size boxes (in terms of disk space) although one is less powerfull than the other. The DR box is kept up to date (almost) using permanent journals. This system is also used for volume testing of incremental development work, full volume testing of new releases of Teradata, the application, the data model etc etc. They also used this box for their Y2K testing. Throughout this period their end-users had no degradation of performance, because the work was done on a second system and the development and testing team could restart the box anytime day or night ! A very happy situation for all.

And even if the DR box isn't being used for destructive testing etc, you could split your user base across the two systems, maybe based on who needs up to date data and who can suffice with data that's a few hours old. Just a thought...



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