System 800xA,Basic History, AdvHtLogDataViewer failed to open files

Hi,
I can't to open files that is larger than 2 Gb, when i try to do it i get message

Is it any restrictions on file size?

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denis.sokhatskiy@ru. Rank: 135

Asked 2 months ago

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I assume you are not trying to open files in active use (e.g. by temporarily stopping Basic History service provider in concerned node) then your finding about 2GB boundary might be a "works as designed".

You could try to set the LargeAddressAware bit on the tool .exe with some MS tool (search Internet for tools available).

Probably, you need to file a support case to get this addressed.

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by denis.sokhatskiy@ru. Rank: 135 on 3/19/2019 10:59:42 PM | Like (0) | Report

Thank you for your answer, Stefan!
I have changed LargeAddressAware bit, but still have the same message.
I think if i will write to support they say that maximum archiving time is 3 month

by Stefan Stromqvist AKS expert

Rank: 1 on 3/20/2019 12:35:48 AM | Like (0) | Report

The three months limitation has been removed in recent system guides (it was never a limit, merely a sales pitch for other historians). You can create 1s logs stretching for 10 years in Basic History.

The performance problem is memory; Basic History has never been benchmarked. Basic History begun almost 20 years ago on 32-bit boundary which was lifted in 5.1 RevD RU5 when the LargeAddressAware bit was set in factory default.

The memory usage by Basic History is governed by many different factors:

a) Number of primary logs

b) Number of secondary logs and their calculation algorithms (e.g. a 1m AVG uses less memory than a 1h AVG when put on top of a 1s primary log)

c) Log period (number of samples on disk)

d) Client count & behavior (clients using Momentary and ExtMomentary drain more resources than clients using TimeAverage)

e) ...

Given the problem to accurately describe all these factors, its difficult to set any upper limit on what you can acchieve with Basic History. A proper benchmarking is required!

One thing for sure; there are few reliable historians like Basic History around. Using simple technique (plain files, editable Log Templates) and tools (AdvHtArchiveTool) makes it easy to change logging geometry.

Also Basic History preallocates space for the log files; i.e. no data will go lost if disk space is reduced.

by denis.sokhatskiy@ru. Rank: 135 on 3/20/2019 1:14:59 AM | Like (0) | Report

Thank you!

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Stefan Stromqvist AKS expert

Rank: 1

Answered 2 months ago

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System 800xA,Basic History, AdvHtLogDataViewer failed to open files

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