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Home > Success Center > Storage Manager (STM) > Storage Manager (STM) Documentation > SRM Profiler Administrator Guide > Use policies and set alerts in SRM Profiler > Data retention policies

Data retention policies

Updated: June 16, 2017

Data Retention Policies allow Administrators to define the duration that they wish to keep each kind of data. The policies are executed once every twenty-four hours by the SRM Profiler Maintenance service. Data Retention Policies are divided into the following categories:

  • Backup
  • Database
  • Events
  • Operating Systems
  • SMI-S
  • SNMP/FC/HBA
  • System
  • Virtualization

These categories are subdivided into types of data. Each type of data has a retention policy for raw and hourly data. Raw data is collected in defined time intervals. For example, raw data for storage arrays is collected every 15 minutes. Hourly data is the average of the raw data over an hourly interval.

The Data Retention Policy is responsible for maintaining the minimum data needed for data roll-up. Data roll-up is a process of calculating the average of the raw data for use in performance tables.

For example, performance data is collected for a device every 2 minutes. When an hour of performance data is collected, data roll-up calculates the average of the last 30 data points (the last hour of data) and inserts it into a summary table of HOURLY data. Once the device collects 24 hours of data, data roll-up calculates the average of the last 24 HOURLY data points from the summary table and inserts it into a summary table of DAILY data. Once the device collects 31 days of data, data roll-up calculates the average of last 31 DAILY data points (last one month of data) from the summary table and inserts it into the summary table of MONTHLY data.

Calculate data retention duration

The table below lists the number of days data is kept for each Data Retention Policy setting.

Data Retention Policy Setting

Number of days data kept for Performance tables

1 day

1 day + x

7 days

7 days + x

1 month

1 month + x

2 months

2 months + x

3 months

3 months + x

6 months

6 months + x

1 year

12 months + x

Forever

Data is kept indefinitely

The value of x depends on the day of the month the Data Retention Policy is run and 1 day<=x<=31 days.

For example: If you configured Settings > SRM Profiler server > Data Retention > Operating Systems > Disk Usage > Raw Data for one month, and if the Data Retention Policy is run on the 15th of December, then the Data Retention Policy retains data for the month of November + 15 days of December. In this example, 45 days of data are kept in the Performance table.

 
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