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Message Posted: Fri, 08 Mar 2002 @ 09:22:41 GMT

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Subj:   Re: UCB pairs & PBSA boards
From:   John Street

The even address is used to the send of data from the TDP to the Teradata system, the odd is for the return parcel.

You would always have a pair of device addresses on the single PBSA (1 PBSA can take up to 8 pairs, but throughput gain drops off after 2 pairs). The PDECONFIG assigns a device pair to a port on the PBSA by the assignment of the even number (last 2 digits only) and the odd therefore gets assigned to the same port. Thus the ESCON infrastructure would have the devices associated with that card/fibre link.

By your question you must have 2 PBSA cards on 1 node by your question which I find is not normally done (unless the system is only 1 or 2 nodes). In the bigger MPP environments I work on normally the PBSA's are spread 1 per node for resilience (saying that though there is one customer I deal with that is an exception to that, where larger throughput is needed and they have more than one PBSA per node on some nodes).


John Street
Senior Principal Consultant,
Relationship Technology Solutions for Financial Services,
NCR Limited

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