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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258 z/OS Distributed File Service zSeries File System Implementation z/OS V1R11
6.1 File system access
The performance of zFS can be influenced by controlling the size of the caches used to hold
file system and log data. There are three caches that can be monitored and controlled to
reduce I/O rates, as follows:
User file cache
This cache is used for all user files and performs I/O for all user files greater than 7 KB.
Metadata cache
User files that are smaller than 7 KB have the I/O from this cache.
Log file cache
This cache is used to write file record transactions that describe changes to the file
system.
Figure 6-1 shows the cache prior ...
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