On Feb 2, 2006, at 2:00 PM, Pugliese, Edward wrote:
...It seems to me that this is mostly a function of a large number of small files. ...
The classic test is to find or fabricate a large file and back up just that one object, and contrast throughput with another test containing the same amount of data but in much smaller files. This is the Black Box approach, where behavior to varying conditions can be measured without knowing anything about internals. IBM provides a variety of TSM tuning guides through the TSM Support Web page, including the standard TSM Performance Tuning Guide. Don't overlook other sources, such as the STE seminars, Oxford presentation, and SHARE presentations. I also collect tips in ADSM QuickFacts, also largely found in the TSM Wiki. And there are all the OS and networking things to wade through. There are a lot of factors to weigh, but it keeps us fully employed. Richard Sims
