Fw: Cache Hit % below 99%
2005-01-20 09:26:12
I have looked at the TSM Performance and Tuning Guide and the System Memory
on the TSM server is 4096MB. Since the table only went to 2048MB, I just
doubled the amount of the recommended buffer pool size to 524288, which I
assumed was in KB. It is still only in the 95% range, so that's why I'm a
little confused as to why it isn't higher...
Server Option Option Setting Server Option Option Setting
----------------- -------------------- -----------------
--------------------
CommTimeOut 60 IdleTimeOut 15
BufPoolSize 524288 LogPoolSize 1024
I looked at the message that the bufferpool size can't exceed 10% of
physical memory. 10% of 4GB would be 419430 KB. 524288 KB > 419430 KB,
but what occurs when it is higher? I didn't really see any info. on what
happens if it is higher... Thanks again!
PS Thanks for the link to that Performance Diagnosis presentation. I'm
sure it will come in handy!
********************************
Joni Moyer
Highmark
Storage Systems
Work:(717)302-6603
Fax:(717)302-5974
joni.moyer AT highmark DOT com
********************************
"Richard Sims"
<rbs AT bu DOT edu>
To
01/20/2005 08:27 "Joni Moyer"
AM <joni.moyer AT HIGHMARK DOT COM>
cc
Subject
Re: Cache Hit % below 99%
Joni - See BUFPoolsize in ADSM QuickFacts.
The TSM Performance Tuning Guide is your best basic reference in
this area.
Richard Sims
On Jan 20, 2005, at 8:19 AM, Joni Moyer wrote:
> Hello All!
>
> I have noticed that the cache hit % is below 99%. This is a newly
> defined
> TSM 5.2.2.5 server on an AIX 5.2 OS. Are there any special
> parameters/definitions that could contribute to the percentage being so
> low? Thanks!
>
> Available Space (MB): 24,576
> Assigned Capacity (MB): 19,484
> Maximum Extension (MB): 5,092
> Maximum Reduction (MB): 15,000
> Page Size (bytes): 4,096
> Total Usable Pages: 4,987,904
> Used Pages: 45,207
> Pct Util: 0.9
> Max. Pct Util: 0.9
> Physical Volumes: 3
> Buffer Pool Pages: 131,072
> Total Buffer Requests: 132,692
> Cache Hit Pct.: 95.15
> Cache Wait Pct.: 0.00
> Backup in Progress?: No
> Type of Backup In Progress:
> Incrementals Since Last Full: 0
> Changed Since Last Backup (MB): 0.73
> Percentage Changed: 0.41
>
> ********************************
> Joni Moyer
> Highmark
> Storage Systems
> Work:(717)302-6603
> Fax:(717)302-5974
> joni.moyer AT highmark DOT com
> ********************************
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