DB2 UDB for z/OS Performance The Basics…
Performance is like a traffic circle
Opportunities – Eyeball method
DASD Subsystems No Silver Bullets…
DASD Subsystems Performance over time…
DASD Subsystems Not isolated poor performance…
How bad can poor I/O performance be?
Good response time – 4K Synch I/O
DASD Subsystems – SMF 42-6 data
Important application performance data
I/O Rate/Second is more Important