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PowerScale OneFS Web Administration Guide

L3 cache on archive-class node pools

Some PowerScale nodes are high capacity units designed primarily for archival work flows, which involve a higher percentage of data writes compared to data reads. On node pools made up of these archive-class nodes, SSDs are deployed for L3 cache, which significantly improves the speed of file system traversal activities such as directory lookup.

L3 cache with metadata only stored in SSDs provides the best performance for archiving data on these high-capacity nodes. L3 cache is on by default, as described in the following table.

Nodes Comments
HD-series For all node pools made up of HD-series nodes, L3 cache stores metadata only in SSDs and cannot be disabled.
Generation 6 A-series For all node pools made up of Generation 6 A-series nodes, L3 cache stores metadata only in SSDs and cannot be disabled.

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