NetApp ONTAP Storage Quality of Service (QoS) allows administrators to manage and prioritize system resources (IOPS and MBps bandwidth) across multi-tenant environments and mixed workloads, preventing "noisy neighbor" problems from impacting business-critical applications. To protect a critical workload from being degraded by competing, lower-priority workloads, an administrator implements two coordinated QoS policies:
Set a throughput floor for a critical workload (Statement D): An administrator assigns an adaptive or fixed QoS minimum throughput limit (floor) to the critical workload. Supported on All-Flash FAS (AFF) and All-SAN Array (ASA) platforms, a QoS floor ensures that the critical workload receives guaranteed minimum I/O performance and prioritized controller scheduling, even during periods of heavy cluster congestion.
Set a throughput ceiling on a competing workload (Statement B): An administrator applies a maximum throughput limit (ceiling) to aggressive, non-critical background workloads (such as bulk data ingest, reporting scans, or dev/test environments). The ceiling throttles the competing workload if it attempts to exceed its allocated bandwidth or IOPS, protecting shared storage resources.
Setting a ceiling on a critical workload (Statement A) would artificially restrict its performance, and setting a floor on a competing workload (Statement C) would prioritize the competing workload over the critical application.
[Reference: NetApp Data Administrator, ONTAP – Performance; Storage Quality of Service (QoS); Managing Workload Priority with QoS Ceilings and Floors in ONTAP 9., , ===============, ]
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