Peter,

I think that VSAM will use as many buffers as there are available.  In
other words, if you have 2700 data buffers and read 2700 different CI's,
VSAM will use all 270 buffers.

The question then is how much you can reduce the buffers without
(significantly) increasing the EXCP count.  I don't know how you can
determine this other than testing at different levels.  

I'm curious as to why you are concerned with BLSR buffers.  Do you have
high paging counts when these jobs are running?

Marty Wertheim 
Mainframe Performance Management
972-245-4632 
 
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