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How Storage QoS works

Storage QoS controls workloads that are assigned to policy groups by throttling and prioritizing client operations (SAN and NAS data requests) and system operations.

What policy groups are

A policy group is comprised of one or more workloads and a performance limit that applies collectively to all workloads in the policy group.

User-defined policy group
Enforces a maximum throughput limit on the storage objects that belong to the policy group by throttling input/output (I/O) requests.