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Canary Labs, a developer of data historian software, has released Trend Historian 8.0, which eases the task of collecting, storing, managing and validating time series data to partners and end users.

This latest version has been upgraded to expand the capacity and performance to higher levels than before.

Trend Historian is available in either a 32- or 64-bit version and has been redesigned to provide high capacities and throughputs.

The performance numbers were determined by the built-in performance profiling monitoring software.

The writing performance of Trend Historian on the server test machine exceeded 3.6 million updates (TVQs) per second and the reading performance exceeded 13 million updates (TVQs) per second.

TVQ is the Trend Historian storage unit that consists of three parts: a Timestamp at 100ns resolution (UTC Filetime); a Value (variant – four- and eight-byte reals, various integers, Booleans and strings); and a Quality (16-bit word), matching the definition of OPC.

The server test machine comprises: a Dell Power Edge 2950 server; two Quad Cores Xeon E5420 2.5Ghz (eight cores total); 16Gb memory; raid with 3-7.2K 250Gb SATA drives; and OS Windows Server 2008 x64, with a street price of less than USD4,000 (GBP2,440) including UPS.

The 64- and 32-bit Trend Historian versions both have similar profiles and performance numbers.

The 64-bit system is about 16 per cent faster for one session and seven per cent faster for eight sessions.

Hard-disk performance will determine individual performance results.

The biggest difference between 32- and 64-bit systems is the increased addressable virtual memory capabilities in the 64-bit system to handle the large tag counts.

With high data volumes, network throughput capabilities must be considered.

Canary can provide some base throughput capabilities based on the type of network connection in place and make recommendations.

Overall system designs need to be considered with the network connections and how the additional loading is going to affect the overall operation of the network to carry non-historian-related traffic.

Canary’s Trend Historian has the scalability for large, high-end systems and small systems.

Once an application exceeds 100,000 tags, the company recommends the use of the 64-bit version to take advantage of the O/S extended addressable virtual memory capabilities to handle large applications.

Since Trend Historian is a multi-threaded application, the amount of clients is not limited by Trend Historian.

It requires very limited resources in the historian and the performance impact is based on the number of tags and data being requested.

Typically, there are two types of data requests.

Historical data requests are usually short, intermittent and interspersed (loading the chart and scrolling around), while live-mode data requests are constant.

The historian handles very efficient requests with minimal performance impact, according to the company.

Thanks to the high performance of Trend Historian, Canary does not have to implement compression techniques or only display selected data points to show fast trend chart data.

The company claims that customers can be sure their raw data is accurate with fast response times, without data integrity being compromised.

Trend Historian does not have any ‘compression’ options.

It will make the data compact to minimise the disk storage requirements.

The data stream from the historian will return the exact data stream that was sent.

Typically, an R4 sample value is compacted to 4.5 bytes to 6 bytes of disk space.

This is normally called ‘no-loss’ compression.

The logger application supports two forms of dead banding: absolute and percentage.

Canary has an Excel application available to help compute disk space needs.

The company has been a charter member of the OPC Foundation since 1996 and an early adopter of OPC technology.

It annually participates in interoperability testing and validation.

The Canary Historian Trending tools are OPC-client and OPC-HAD-server-based solutions that are tested and fully compliant with the OPC Specifications as tested in the OPC compliance laboratory in Germany.

The Canary historian and trend link will support the new OPC-UA standard within the next few months.

Administrative tools include performance monitoring, audit trail, automatic validation, data file management and data synchronisation between systems.

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