RE: System tuning recommendations

["Andy Nolen-Parkhouse" <aparkhouse@xxxxxxxxxxxx>]

Mike,

I generally measure system performance by user complaints, not by
response times.  If your users are content with the performance of your
system, then why change anything?

>From the looks of your system status displays, you really do not have
any pool allocations because all of your pools are managed by the
system.  If you have some grizzled veterans among your counterparts in
the other divisions, they may feel that the performance adjustments
could never perform the level of tuning that they can obtain manually.
This has a historical base in the earlier releases of OS/400, which
really did not do an exemplary job of managing resources.  It may also
have a base in arrogance and professional pride.

As a grizzled veteran myself, I've found that for a fairly generic
system, performance under system control provides more than adequate
allocation of resources and responds to changing requirements promptly
enough.  It is 'good enough'.  If you start to require special batch
subsystems or something different, you may find some manual tuning
beneficial.

What would your counterparts propose?
Are your users content?

Andy

Andy Nolen-Parkhouse
IBM Certified Expert, iSeries Technology

> On Behalf Of Condon, Mike
> Sent: Friday, October 19, 2001 4:49 PM
>
> Some of our counterparts in other divisions managing AS400's have
> commented
> negatively
> on our pool size allocation, and also against using IBM's QPRFADJ set
to 3
> (they prefer 0).
> Our system is primarily green screen rpg/db2 stuff, fairly
> straightforward.
> We have about
> 200 open interactive sessions on a typical day. Our interactive CPW is
70.
>
> My question is - do any of you all have any recommendations for system
> tuning given our application?
>
> Here is a snapshot of our wrksyssts:
>
>                             Work with System Status
> S105DGAM
>                                                              10/19/01
> 15:29:26
>  % CPU used . . . . . . . :        7.0    Auxiliary storage:
>
>  % DB capability  . . . . :        3.0      System ASP . . . . . . :
> 77.30 G
>  Elapsed time . . . . . . :   00:00:40      % system ASP used  . . :
> 29.5261
>  Jobs in system . . . . . :       2233      Total  . . . . . . . . :
> 77.30 G
>  % perm addresses . . . . :       .007      Current unprotect used :
> 2589 M
>  % temp addresses . . . . :       .053      Maximum unprotect  . . :
> 54509 M
>
>
>  Type changes (if allowed), press Enter.
>
>
>
>  System    Pool    Reserved    Max   -----DB-----  ---Non-DB---
>
>   Pool   Size (M)  Size (M)  Active  Fault  Pages  Fault  Pages
>
>     1      111.03     67.31   +++++     .0     .0   15.3   25.2
>
>     2      201.78       .26      43     .0     .0    3.7   13.9
>
>     3       10.23       .00       8     .0     .0    4.0    8.0
>
>     4      700.93       .00      36    1.5    6.0   10.8   25.0