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OpenEdge Replication and after-imaging : The role of after-image extents in the Replication process : Calculating fixed after-image extent size : After-image extent sizing based on weekly data
 
After-image extent sizing based on weekly data
Using the total size of after-image extents for one full workweek, the sizing calculations described in the following table are performed.
Table 4. After-image extent sizing calculations (weekly data)
Description
Measurement/estimate
Total after-image data generated in one typical week
15000MB, or 14.6 GB
OpenEdge Replication after-image overhead
50%, or 1.5 multiplier
Number of processing hours during a typical workday
16 hours per day
Number of processing hours during the typical workweek
112 hours (16 hours per day x 7 days)
After-image data generated in one hour
134MB(15000MB / 112 hrs in week)
After-image data generated in one day
2144MB, or 2.09GB(134MB x 16 hours)
Estimate of after-image data generated in one hour with OpenEdge Replication overhead
201MB (134MB x 1.5)
Estimate of after-image data generated in one day with OpenEdge Replication overhead
3216MB, or 3.14GB(2144GB x 1.5)
Estimate of after-image data generated in one workweek with OpenEdge Replication overhead
22512MB (3,216MB x 7 days)
Single fixed after-image extent size
804MB (201MB x 4 hours)
Total number of after-image extents necessary to handle one week of processing
28 extents (22512MB / 804MB)