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 235
The allocations shown in Figure 5-8 will optimize journal performance for 2, 4, and 8 journal
data sets.
Figure 5-8 Allocation of journal data sets
Size of journal data sets:
The aggregate, minimum size for the allocated journal data sets should be at least twice
the size of the total SDM buffer. For example, if you have 10 XRC storage control
sessions running in an SDM, and 576 buffers per storage control session (which is the
current default), SDM would have 5760 full track buffers available. This represents the
equivalent of 384 cylinders, and so 768 cylinders should be allocated.
If eight journal data sets ...
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