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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Chapter 2. Installing and using zFS 21
When a linear data set is defined, the catalog forces the block size to 4096 bytes. For VSAM
data sets in general you can specify a control interval size of 4096 to 32,768 bytes in
increments of 4096 bytes. There are further rules regarding how specified values are
rounded. Using a variable value for the CI size is not allowed for zFS aggregates; otherwise,
you receive an error message when trying to start the format processing.
zFS aggregates and VSAM LDS
As mentioned, the CI size of a zFS aggregate is always 4 K. zFS always reads and writes an
8 K block (two CIs) at a time. zFS can write multiple small ...
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