Hi Albrecht,
By default for some of the counter groups the retention is only a week.
priorityqueue mpo-vsim14 1.0 minutes 1.0 weeks 10080 768 bytes 768 bytes
priorityqueue mpo-vsim13 1.0 minutes 1.0 weeks 10080 768 bytes 768 bytes
priorityqueue mpo-vsim11 1.0 minutes 1.0 weeks 10080 768 bytes 768 bytes
priorityqueue mpo-vsim16 1.0 minutes 1.0 weeks 10080 768 bytes 768 bytes
wafl mpo-vsim14 1.0 minutes 1.0 weeks 10080 1007 KB 1007 KB
wafl mpo-vsim13 1.0 minutes 1.0 weeks 10080 1007 KB 1007 KB
wafl mpo-vsim11 1.0 minutes 1.0 weeks 10080 1007 KB 1007 KB
wafl mpo-vsim16 1.0 minutes 1.0 weeks 10080 1007 KB 1007 KB
qtree mpo-vsim14 1.0 minutes 1.0 weeks 10080 7.90 MB 7.90 MB
qtree mpo-vsim13 1.0 minutes 1.0 weeks 10080 3.18 MB 3.18 MB
qtree mpo-vsim11 1.0 minutes 1.0 weeks 10080 1.93 MB 1.93 MB
qtree mpo-vsim16 1.0 minutes 1.0 weeks 10080 4.44 MB 4.44 MB
You can use the dfm perf data list to find what is the retention.
Also read on this TR how to modify your retention.
TR 4090 - Performance Advisor Features and Diagnosis:OnCommand Unified Manager 5.0/ 5.1 Operating in 7-Mode
Regards
adai