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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260 z/OS Distributed File Service zSeries File System Implementation z/OS V1R11
Figure 6-2 Output from the f zfs,query,all command
6.3 Metadata cache
The metadata cache is used to contain all file system metadata, which includes the following:
All directory contents
File status information, which includes atime, mtime, size, permission bits, and so on
File system structures
Caching of data for files smaller than 7 K
6.3.1 Metadata cache monitoring
Metadata is referred to and updated very frequently for most zFS file operations, so achieving
a good hit ratio is often essential to good performance for most workloads. A good hit ratio
might be ...
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