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Choosing cache types

For XBM to provide reliable snapshot processing, you must specify an appropriate cache type of sufficient size for the extended buffer and for managed objects.


This cache balances system impact with the probability that the cache is large enough to handle all of the preimages that will be stored in the cache at one time.

System impact usually consists of increased system paging, such as:

  • Paging of XBM address space control structures
  • Paging of data in the XBM virtual storage caches
  • Paging of other address spaces as the result of XBM central storage allocation

To specify an appropriate cache, you must know what resources are available to your system and what kind of activity occurs on the system.

Warning

Important

For more about managing system resources, see the IBM MVS System Tuning Guide and the IBM MVS System Tuning Reference.

This section contains the following topics:

Related topic

Enabling-software-snapshots



 

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