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:[EMAIL PROTECTED]]
>Sent: Thursday, June 21, 2001 12:45 PM
>To: [EMAIL PROTECTED]
>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" <[EMAIL PROTECTED]>@VM.MARIST.EDU> on 06/21/2001 11:04:01
>AM
>
>Please respond to "ADSM: Dist Stor Manager" <[EMAIL PROTECTED]>
>
>Sent by: "ADSM: Dist Stor Manager" <[EMAIL PROTECTED]>
>
>
>To: [EMAIL PROTECTED]
>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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