The selftunebufpoolsize only adjusts your bufferpool size when you run
expiration.  If you are like us and only run expiration once a week it
isn't much help.  Part of the selftunebufpoolsize process involves
resetting the bufpool statistics, but again this only happens when you run
expiration.
Jim Sporer

        At 01:07 PM 6/21/2001 -0500, you wrote:

My Buffpoolsize is set to 65536 and SelfTunebufpoolsize is set to yes as
well.  So I would assume it would tune itself to the right value.  I'm
thinking maybe the reset of buffpool stattistics will help.  Is resetting of
the buffpool statistics something that need to be don everyday.  In order to
get a true value each day.


-----Original Message-----
From: George Lesho [mailto:GLesho AT AFCE DOT COM]
Sent: Thursday, June 21, 2001 12:45 PM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: Cache Hit Pct.


Richard, Your cache hit percentage is too low at 95.6 percent and as you
have pointed out, should be around 98 percent of above. To change the
percentage of your cache hits, increase by doubling, the size of your
BUFPOOL parameter in your dsmserv.opt file on your TSM server:

entry from my dsmserv.opt file:
BUFPOOLSIZE     16384

You should then wait a day or two and see what it rises to. Each time, you
will need to reset the associated statistics with
the "reset bufpool". You can then check your cache hit percentage using the
"q db f=d" command:

tsm: AFCOPS2>q db f=d

          Available Space (MB): 13,172
        Assigned Capacity (MB): 11,420
        Maximum Extension (MB): 1,752
        Maximum Reduction (MB): 1,780
             Page Size (bytes): 4,096
            Total Usable Pages: 2,923,520
                    Used Pages: 1,441,070
                      Pct Util: 49.3
                 Max. Pct Util: 50.1
              Physical Volumes: 3
             Buffer Pool Pages: 4,096
         Total Buffer Requests: 31,549,306
                Cache Hit Pct.: 98.94
               Cache Wait Pct.: 0.00
           Backup in Progress?: Yes
    Type of Backup In Progress: Full
  Incrementals Since Last Full: 0
Changed Since Last Backup (MB): 0.52
            Percentage Changed: 0.01
Last Complete Backup Date/Time: 06/20/01   12:02:59


Hope this is what you were looking for... I suspect your TSM server is
running a tad slow... just don't overdo upping the
bufpool size and wait for at least a day to let the new bufpool size have a
chance to show a true value for the cache hit
percentage....

George Lesho
Storage/System Admin
AFC Enterprises



)))))))))




"Dearman, Richard" <rdearm1 AT UIC DOT EDU>@VM.MARIST.EDU> on 06/21/2001 
11:04:01
AM

Please respond to "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>

Sent by:  "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>


To:   ADSM-L AT VM.MARIST DOT EDU
cc:
Fax to:
Subject:  Cache Hit Pct.


Anyone know of a good way to raise Cache Hit Pct to above 98%.  I continue
to get 95.6% and I tried the performance tuning setting an still get cann't
get it above 98%.  Tivoli manuals state that Cache Hi Pct should remain
above 98%.

Thanks
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