Bill,
Today I ran 30 concurrent DDR's against 2 mod9's. The MDC usage (of 9G
MDC ) was 1%
The source volume was 99% busy. With 800+ SSCH'ps.
I expect I will have to run this again, since there were updates missing
from the source.
Phil
Bill Bitner wrote:
In this case, if you are using DDR from a single virtual machine,
I would not expect MDC hits as there is no re-referencing of data.
Also, there are some corrections to documentation. Fullpack mdisks
are eligible for MDC if set up correctly. At one point in time,
if FPMs defined by DEVNO were not eligible, but that restriction
was lifted many releases ago (in the code, not in the doc).
Besides the books, you can find more at:
http://www.vm.ibm.com/perf/tips/prgmdcar.html
Bill Bitner - VM Performance Evaluation - IBM Endicott - 607-429-3286
--
'in media stat virtus'
Virtue's in the middle
