The Load Meter in the Pure1 GUI shows a consistently high workload, averaging a 90% load over the past hour. The array also has high space usage of…

The FlashArray's Purity Operating Environment includes a non-configurable, adaptive Quality of Service (QoS) system designed to maintain array stability under all conditions. When the array experiences a sustained high workload (e.g., 90% load), this internal QoS mechanism will automatically begin to throttle incoming host I/O. This action, often referred to as applying "backpressure," ensures that critical internal system processes (like metadata services, garbage collection, and health monitoring) receive enough resources to function correctly. This self-preservation behavior prevents the controllers from becoming overwhelmed, thus ensuring the array remains responsive, stable, and continues to protect data.

B. While background tasks are managed, the primary, most impactful response to high load is throttling host I/O to protect the entire system's health.

C. Prioritizing space reclamation would add more load to an already saturated system, worsening performance and potentially leading to instability. Host I/O is prioritized over background tasks.

1. Pure Storage, "Architectural Principles of the Pure Storage FlashArray," White Paper, Section: "Stateless Controller Architecture." This paper discusses how Purity manages resources and prioritizes system tasks to ensure high availability and predictable performance, even under load.

2. Pure Storage Knowledge Base, "FlashArray Load," Article 000001780. This article explains that the load value represents controller utilization and that Purity OS will manage resources to prevent overload, which includes throttling I/O.