November 2003
Intermediate to advanced
212 pages
6h 37m
English
book
S/390 PartnerWorld for Developers, ITSO/EFS Project EFS Systems on a Linux Base: Additional Topics
by Bill Ogden, Michael Ryan
Content preview from S/390 PartnerWorld for Developers, ITSO/EFS Project EFS Systems on a Linux Base: Additional Topics
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Chapter 8. z/OS base sysplex on z/VM 129
those volumes effectively inaccessible. Even in an emulated-DASD environment, some
factors weigh in favor of dedicated volumes—with more volumes, there may be more
possibilities for concurrent I/O. So the trade-off is as follows: more emulated DASD may
degrade performance by spreading the data farther apart on the underlying server disk, but
more emulated DASD may also improve performance by segregating processes with long
reserve times and providing more concurrency.
Additional dedicated volumes and RNL changes
After we provided a dedicated checkpoint volume and two separate volumes containing
couple data sets, performance improved dramatically. However, we still saw some
occurrences of global reso
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