>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)