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 57
This solution is not perfect because system A is the first one accessing the data set and still
loses its R/W access.
With z/OS V1R6, zFS has implemented a different technique to guarantee a correct state for
zFS aggregates that are accessed R/W in a system, as explained here:
The identifier is cleared when a compatibility mode aggregate is successfully unmounted
or a multi-file system aggregate is detached.
A daemon process updates the time stamp twice a minute.
These two actions are sufficient to ensure that a second system trying to get access in
read/write mode can recognize whether there is another system writing to the aggregate
already. This implementation with zFS assures that the first system ...
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