>We were under the impression, however, that specifying any AMP= parm in the
>JCL would override system managed buffering. (In this case, the DD had
>AMP=('BUFNI=50,BUFND=10').) Have we misunderstood?
Well, to answer my own question for the sake of the archives and in case
someone else has the same confusion, this came from IBM in response to our
ETR:
"The only way, I am aware of, that you can override the Data Class attribute
of Record Access Bias of SYSTEM, is by coding the sub-parameter ACCBIAS=USER
as part of the AMP= parameter on the DD statement of the appropriate VSAM
data set. For example, AMP=('ACCBIAS=USER').
The other AMP= sub-parameters (BUFND, BUFNI, OPTCD, RMODE31, etc.) have
nothing to do with System Managed Buffering (SMB), only the ACCBIAS sub-
parameter has anything to do with SMB."
We understood from the FM that ACCBIAS could override the Record Access Bias
of the DATACLAS definition, but to us the manual wasn't quite so clear on
the information about how SMB relates to the other AMP parms. I appreciate
it being stated clearly to us. Perhaps others will too.
Greg Shirey
Ben E. Keith Company
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