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 6. Concurrent Copy 277
DFSMSdss uses the SDM to read data from the devices within the Concurrent Copy session.
For data that was not included in the Concurrent Copy session, DFSMSdss reads the data
itself in the same way as for a non-Concurrent Copy operation. As DFSMSdss receives
tracks from the SDM, or reads them itself, it writes the data to the output device
in the same
way
as for any DFSMSdss operation.
6.4.3 Intercepting the writes
The purpose of Concurrent Copy is to take a copy of data without including any updates that
are made to the data while the copy proceeds. To achieve this, the ESSs involved in a
Concurrent Copy session monitor I/Os to the tracks included in the session. If an I/O is about
to update a track that SDM h ...
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