Product Administration › Data Collector Caching of Polled Data When the Data Aggregator Host is Unavailable › Calculate the Memory Required for Poll Data Caching

Calculate the Memory Required for Poll Data Caching

The amount of memory that is required for caching polled data depends on the following information:

• The scale of your environment.
• How long you want to store data when the Data Aggregator host is unavailable.

To calculate the amount of memory that is required for data caching, use the following formula:

Cache Required(GB)= (Time To Cache Data(sec)× Number of Polled Items)/(262144 ×Average Poll Rate(sec))

Example: Calculate the Memory Required for Caching Polled Data for an Hour

• Calculate the memory that is required in a small-scale environment where Data Collector is polling 50,000 devices and components at a five-minute poll rate. You want to cache the polled data for an hour while Data Aggregator is unavailable:

  Cache Required (GB)=(3600 ×50000)/(262144 ×300)

  Cache Required (GB)=2.3 GB

  Note: This calculation is in addition to the basic operational memory requirements. A small-scale environment requires 2 GB for basic operational memory requirements. Therefore, the total memory that is required is 4608 M (2 GB + 2.3 GB).

• Calculate the memory that is required in a large-scale environment where Data Collector is polling 500,000 devices and components at a five-minute poll rate. You want to cache the polled data for an hour while the Data Aggregator is unavailable:

  Cache Required (GB)=(3600 ×500000)/(262144 ×300)

  Cache Required (GB)=22.9 GB

  Note: This calculation is in addition to the basic operational memory requirements. A large-scale environment requires 24 GB for basic operational memory requirements. Therefore, the total memory that is required is 47 GB (24 GB + 22.9 GB).