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 241
Performance:
In this case we may assume that SDM has the dedicated use of processor resources.
Thus SDM tasks will always execute with priority, the maximum number of real storage
buffers can be defined for SDM operations, and SDM can optimize channel path selection
both for reading from the primary site and writing to the secondary site, because there is
no contention for channel resource.
However, an extended distance between the independent site and the secondary site will
impact performance for journaling and copying to secondary volumes.
5.19.3 SDM at the primary site
The SDM can run in the same z/OS (or ...
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