Free performance monitoring for VMware™ and IBM Power Systems™

Data retention

LPAR2RRD uses for data keeping product RRDTool (round-robin database tool). Data is stored in a round-robin database (circular buffer) A round-robin archive stores a fixed number of raw data. After that data being averaged.

Retention of data is configured in LPAR2RRD since v3.10 and actually is:
Time intervalRetention
1 minute (all data) 60 days
5 minutes averages     3 months
1 hour averages 6 month
5 hours averages 1 year
1 day averages 3 years

This means that you have all data (1 minutes samples) available 60 days back for historical reporting, then 5 minutes averages are available 3 months back etc ...

This retention is applicable only to new data objects (newly created pools/lpars) in LPAR2RRD since 3.10. Already created objects (pools and lpars) use older retention setup:
Time intervalRetention
1 minute (all data) 30 days
5 minutes averages     2 months
1 hour averages 1 month
5 hours averages 6 months
1 day averages 3 years

Basically retentions of all objects can be whenever changed by commands of RRDTool product. This can be also easily scripted.
There are two dependencies which need to be taken into consideration before changing it:
  • Space consideration, old setup had 1.7MB size per an object (lpar/pool), new has 3.7MB
  • When it is changed to some custom setup then is necessary change also LPAR2RRD defaults for creating of new objects (pools/lpars)

Note: LPAR2RRD PREMIUM support covers changing retention to whatever what the customer prefers.