Carol,
  It will take you around 30,000 4k buffers for each
100 meg message that you intend to have memory
resident.
100*1048576/3600=29127 rounded or,
room for 9 100meg messages, per gig of memory.
  You'll want to turn on SMF115 records, uses not so
much disk and the performance hit is arounf 5%.
  Employ the support pack:
MP1B: WebSphere MQ for z/OS V5.3 - Interpreting
accounting and statistics data
to review the SMF data.  They include some sample
data, to verify that you've set things up correctly.
  Maybe, if you've got plenty of disk and can take the
11% performance hit, for a little while, you can turn
on the SMF116 records (the systems team has not
allowed me to do this yet).
  Wish I could give you a significantly more
experienced answer. I'm doing this analysis myself, at
work, and would be interested in collaborating with
you, while you do this analysis too.
  My business email is:
[EMAIL PROTECTED]
Hope to hear from you,
Chris



--- "Criscione, Carol (DIS)" <[EMAIL PROTECTED]>
wrote:

> We have large messages ranging from 1-100Meg.  I
> think my number of buffers
> is too low.  What does anyone suggest for # of
> buffers, especially for a
> 100Meg message?
>
> Also, do you recommend increasing the region size if
> I substantially
> increase the number of buffers?  If so, best guess
> on how much?
>
> ThanX!
> Carol Criscione
> [EMAIL PROTECTED]
>
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