November 2001
Intermediate to advanced
158 pages
5h 10m
English
Content preview from IBM ESS and IBM DB2 UDB Working Together
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Chapter 7. Database backup and recovery 101
When an application writes data to either source or target, ESS first stores the data in cache,
and notifies the application that the write is complete. Some time later, before ESS moves
modified data to disk, it also moves an appropriate portion of data from the source to target
physical disks. Because the data movement is a background operation, ESS avoids delaying
the host write response times.
If no write operations occur to a given item of data, then ESS services read requests for either
logical copy (source or target) from a single physical image of the data on the source disks. In
this way, FlashCopy postpones the work of actually performing a physical copy for as long as
possible. Such wor ...
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