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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234 IBM TotalStorage Enterprise Storage Server: Implementing ESS Copy Services with IBM eServer zSeries
5.18.1 Defining the XRC journal data set
The SDM uses the journal data set(s) as temporary storage, to harden a Consistency Group
until all of its data is committed to the secondary devices. The bandwidth required to write the
Consistency Groups to the journal data sets is the same as the bandwidth required to offload
the updates from the primary LCUs.
Journaling is an area that can be easily become a bottleneck and contribute to SDM slowing
down. If not properly configured, the result could be that the Consistency Groups would
accumulate in SDM’s address space, because the journal data sets did not have the
necessary performance.
Journal da ...
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