February 2010
Intermediate to advanced
460 pages
16h 22m
English
book
z/OS Distributed File Service zSeries File System Implementation z/OS V1R11
by Paul Rogers, Robert Hering
Content preview from z/OS Distributed File Service zSeries File System Implementation z/OS V1R11
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282 z/OS Distributed File Service zSeries File System Implementation z/OS V1R11
Figure 6-32 Job to run a specified amount of large random I/Os
6.15.2 Comparison results
We always used TYPEIOS=R70 and tested with 10, 20, and 40 processes running in parallel.
With the HFS, we did not change the cache at all during the tests. With zFS, the cache still
had good data in it after doing a number of I/Os. Therefore, we decided to always run a test
twice for zFS to demonstrate how this may change response times.
Afterwards we stopped and restarted zFS to be sure the cache was invalidated. It turned out
that good cache data may help for a second, similar ...
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