July 2004
Intermediate to advanced
496 pages
16h 46m
English
book
IBM TotalStorage Enterprise Storage Server Implementing ESS Copy Services with IBM eServer zSeries
by Cathy Warrick, Paul Jenkin, Claus Schiefer, Jiri Spacek
Content preview from IBM TotalStorage Enterprise Storage Server Implementing ESS Copy Services with IBM eServer zSeries
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Chapter 5. Extended Remote Copy 261
You can use the RFREQUENCY and/or the RTRACKS parameters in the XSET command to
tell the ESS (for hardware bit maps) and the SDM (for software bit maps) when those bitmaps
should be reset. ESS and SDM will reset bit maps according to those parameters for all active
volumes, bit maps for suspended volumes will not be reset.
In the RFREQUENCY parameter you can specify how often, in hours, minutes, and seconds,
the bit maps should be reset. With the RTRACKS parameter, you specify the number of
tracks that must change before the bitmaps are reset.
The default for RFREQUENCY is 30 minutes. If you specify a value of 0, XRC will not reset
the bit maps as a result of elapsed time.
The default for RTRACKS is 7500 tracks. ...
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