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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214 IBM TotalStorage Enterprise Storage Server: Implementing ESS Copy Services with IBM eServer zSeries
2. The application I/O operation is signalled completed when the data is written to primary
ESS cache and NVS; this is when
channel end and device end are returned to the primary
system. Thus, the application write I/O operation has completed, and now the updated
data will be mirrored asynchronously as per the following steps.
3. The ESS groups the updates into record sets which are asynchronously off-loaded from
the cache to the SDM system. As XRC uses this aynchronous copy technique, there is no
performance impact on the primary applications’ I/O operations.
4. The record sets, perhaps from multiple primary storage subsystems, are proce ...
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