Isilon InsightIQ User Guide

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Overall Cache Hit Rate report

The Overall Cache Hit Rate report shows the percentage of data requests that returned hits.

A hit means that the requested data was available in cache. Higher hit rates indicate that more of the requested data is being retrieved from cache.

In the graph, you can plot data for the L1, L2, and L3 caches, or any combination of the three.

Table 1. Cache descriptions
Cache	Description
L1	Private to the node servicing input-output requests
L2	Global across all nodes
L3	Read only, data is stored on a solid state drive (SSD) instead of RAM

Break out the data for a selected cache by cache data type and node. If you want to determine if input-output is balanced across nodes or node pools, examining node details can be helpful.

Also, InsightIQ provides specific charts for throughput rates of the individual L1, L2, and L3 caches.