Historian Disk Usage

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When storing historic files the Raw Historic, Modified Historic, Annotation and Event Journal records are of a fixed size (in bytes) as follows:

Historian Type	Record Size (bytes)
Raw Historic (HRD)	32
Modified Historic (HMD)	104
Annotation (HAD)	340
Event Journal (MWJ)	768
Configuration Change (CCS)	1300

Here are some quick calculations as a guide for estimation of disk usage excluding file system overhead:

1 billion (1,000,000,000) raw historic records = 32,000,000,000 bytes = approximately 30GB of disk space.

1 billion (1,000,000,000) event journal records = 768,000,000,000 bytes = approximately 715GB disk space.

This information along with details of your server's historic usage can be found in the Server Status dialogue under the Historic->Historian section.

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