HistorianHistorian Server Performance Tags
The following table provides information about the various Historian Server Performance tags.
| Tag Name | Description |
|---|---|
| PerfTag_CompressionRatio | Specifies the current effect of archive data compression. |
| PerfTag_MinimumCompressionRatio | Specifies the minimum compression ratio. |
| PerfTag_MaximumCompressionRatio | Specifies the maximum compression ratio. |
| PerfTag_TotalEvents | Specifies the total number of data samples reported to the Historian archive from all sources. |
| PerfTag_TotalOutOfOrder | Specifies the total out of order data samples. |
| PerfTag_AverageEventRate | Specifies the average number of data samples per minute sent to archiver from all sources |
| PerfTag_MinimumEventRate | Specifies the minimum number of data samples per minute sent to archiver from all sources. |
| PerfTag_MaximumEventRate | Specifies the maximum number of data samples per minute sent to archiver from all sources. |
| PerfTag_WriteCacheHitRatio | Specifies the hit ratio of the write cache in percent of the total writes. |
| PerfTag_TotalFailedWrites | Specifies the total number of samples since startup that failed to be written. |
| PerfTag_TotalMessages | Specifies the total messages (for example, connection or audit messages) received by the archiver since startup |
| PerfTag_TotalAlerts | Specifies the total number of alerts received by the data archiver since startup. |
| PerfTag_FreeSpace | Indicates the free disk space left in the current archive. |
| PerfTag_SpaceConsumptionRate | Specifies an archive disk space consumption rate in megabytes per day. |
| PerfTag_PredictedDaysToFull | Indicates the approximate number of days required for an archive to fill. |
| PerfTag_MemoryUsage | Specifies the amount of RAM used by the Data Archiver. |
| PerfTag_MemoryVMSize | Specifies the amount of virtual memory used by the Data Archiver. |
| PerfTag_TotalAlarms | Specifies the total number of alarms received by the Data Archiver since starting up. |
| PerfTag_AverageAlarmRate | Specifies the average alarm rate in alarms per minute received by Data Archiver. |
| PerfTag_TotalFailedAlarms | Specifies the total number of alarms since startup that failed to be written. |
| Perftag_ReadQueueSize | Specifies the total number of messages present in the Read queue. |
| Perftag_AverageReadRate | Specifies the total number of data samples per minute returned from the Data Archiver for all read requests. |
| Perftag_ReadQueuePushRate | Specifies the number of read requests per minute that came into the archiver from all clients. A read request can return multiple data samples. |
| Perftag_WriteQueuePushRate | Specifies the number of write requests per minute that came into the archiver from all clients. A write request can contain multiple data samples. |