Rockwell Automation FactoryTalk Historian SE ProcessBook 3.2 User Guide - Manual (Page 328)

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FactoryTalk Historian ProcessBook User Guide
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primary server continue to function. If the use of ProcessBook on a
workstation requires access to the primary, then specifying
RequirePrimary forces the application to only connect to a primary
member and fail when such a connection cannot be completed.
Recommended Connection Preference Setting
Most ProcessBook displays do not write data to the FactoryTalk Historian
server and therefore work equally well against primary and secondary
member servers. A setting of Any is sufficient and supports the static load
balancing configured in the FactoryTalk Historian sdk.
A setting of PreferPrimary also works well but does not allow the
workstation to participate in load balancing when running ProcessBook.
If you use RequirePrimary, and the primary is unavailable, the
application behaves as it did without High Availability when the server is
unreachable. When this occurs during the opening of a display, the error
returned by the connection attempt is displayed in the Status Report
dialog box for each tag on the server. Typically, the message reads:
The requested server in not currently available. Primary.