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MVS Paging vs VP BuffersMVS Paging vs VP Buffers
Notes:
Increasing the size of the DBM1 address space beyond the capacity of Central Storage (as an overall consumption of all address spaces) will increase the MVS system paging rate. Even without paging to DASD (Death), this will impact application performance and response times. This appears as ‘MVS Overhead’, or unaccounted time, in the Class 2 elapsed times after all Class 3 wait times are subtracted. A good MVS overhead range for online transactions is approximately 1.5 or less, TSO should usually be in the 5-7 range, and Batch may range from 5 - 20 (with 10 as a good number) depending on workload mix and processor busy rate.
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