eG Monitoring

Measures reported by OraZFSARL2StTest The L2ARC is the Second Level Adaptive Replacement Cache and is an SSD based cache that is accessed before reading from the much slower pool disks. The L2ARC is currently intended for random read workloads. This test monitors the accesses to the L2ARC cache and helps to understand how well the current workload is caching in L2ARC. Outputs of the test: One set of results for the Oracle ZFS Storage System being monitored. The measures made by this test are as follows:
Measurement | Description | Measurement Unit | Interpretation
--- | --- | --- | ---
peakHits | Indicates the peak hits during the last measurement period. | Hits/sec | The detailed diagnosis shows when performance of the device had hit peaks.
avgHits | Indicates the average hits during the last measurement period. | Hits/sec | A high value is desired for this measure. A very low value is a cause for concern.
peakMisses | Indicates the peak misses during the last measurement period. | Misses/sec | The detailed diagnosis shows when the performance of the device had failed.
avgMisses | Indicates the average misses during the last measurement period. | Misses/sec | A high value of this measure can cause performance degradation of the system and increases latency.