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What a Flash Pool aggregate is

A Flash Pool aggregate combines both SSDs and HDDs (performance or capacity) to provide a high-performance aggregate more economically than an SSD aggregate.

The SSDs provide a high-performance cache for the active data set of the data volumes provisioned on the Flash Pool aggregate, offloading random read operations and repetitive random write operations to improve response times and overall throughput for disk I/O-bound data access operations. (Performance is not significantly increased for predominately sequential workloads.)