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Isilon InsightIQ User Guide

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Overall Cache Throughput Rate report

The Overall Cache Throughput Rate report shows the amount of data that was requested from cache and how much of the requested data was available in cache.

In this chart, you can plot data for starts and hits on the L1, L2, and L3 caches (or any combination of the three). A start refers to the amount of data requested from a given cache, while a hit refers to the amount of data available in a given cache. You can also break out the data starts or hits for a particular cache, and, in addition, by cache data type or node for that cache.

Table 1. Cache by Type
Cache Description
L1 Private to the node servicing input-output requests
L2 Global across all nodes
L3 Read only; stored on SSD instead of RAM

By comparing this graph to the disk, protocol, and network throughput rates, you can determine the actual impact of cache throughput on system performance.

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

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