Hi Farren!
Is this the manual you are looking for?
http://publib-b.boulder.ibm.com/Redbooks.nsf/9445fa5b416f6e32852569ae006bb65
f/ede73841f6c641108525676a00536b23?OpenDocument
Kindest regards,
Eric van Loon
KLM Royal Dutch Airlines
-----Original Message-----
From: Farren Minns [mailto:fminns AT WILEY.CO DOT UK]
Sent: Wednesday, February 19, 2003 11:15
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: DB Cache Hit Rate Question
Can anybody tell me where I can locate a copy of the TSM 3.7 Technical Ref
Redbook.
I assume it is a seperate entity to the Admin Guide and Admin Reference.
Thanks
Farren Minns
John Wiley & Sons Ltd
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:
Subject: Re: DB Cache Hit Rate Question
>I'm a little confused about the cache hit ratio information. If I run
>expiration on a database, surely the TSM server has to trawl through the
>entire thing on disk as it does not already reside in the buffer. So how
>would I expect to see hit ratios of 99% or higher. I won't go into details
>here as I'm more interested in the process of how the database and cache
>work than out particular performance problems. But, as we do very little
in
>the way of restores, surely the amount of time that a requested database
>file is present in the cache must be very low, so a cache hit ratio of
>96-98% would make sense.
Farren - If you have not yet delved into the TSM Technical Guide
redbooks, you will find them excellent reading, particularly as
they serve as a record of the evolution of the product. The TSM 3.7
Technical Guide in particular talks about the buffer pool size and use
of Expiration as a self-tuning measure.
Richard Sims, BU (home shoveling today)
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