Rockwell Automation 1756-HIST2G Historian ME 2.1 - Manual (Page 109)

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Archive Statistics
The Archive Statistics section displays information about file system usage.

Total Archive - total amount of disk space allocated for the data archive.

Total Archive Used - total amount of disk space currently in use for archived data
on the archive partition.

Total Archive Free - total disk space available on the archive partition. This space
is not currently in use.
Archive Information
As data is received from the Data Collection service, it is stored in the archive files in
the NAND memory module. The Archive Information section displays:

Total Archive Files - number of archive files is determined by the capacity of the
NAND (flash) memory.

Transferred Archives - number of archive files transferred to FactoryTalk
Historian SE.

Available Archives - number of archive files that do not have any data stored in
them. This is the number of archive files that are available before they are
overwritten.

Archive File Size - size of the archive files is 10MB.
Archive file sizes are hardware-dependent. The 1GB module has 40 pre-allocated
10MB archive files. The 2GB module has 130 pre-allocated 10MB archive files.
They are preset and cannot be changed.
Event Queue
The Event Queue section displays the number of temporary archive files in a transient
state. The FactoryTalk Historian ME processes these files as soon as it archives
events in the files. Under normal conditions, this count should be under three.
When the count becomes large, it may cause the archive disk to reach its user-
configured threshold. If the user-configured threshold is reached, Data Collection will
stop automatically and data interruption will occur.
See “Archive Disk Threshold Configuration” for details related to data interruption and
stopping Data Collection.