A customer has demanding database servers, which require larger I/O queue counts and queue depths. What should be done to increase these parameters for certain hosts?
A.
Add the hosts to the subsystem with high priority.
B.
Decrease the QoS policy for the volumes that are in use by the namespaces.
C.
Increase the QoS policy for the given namespace.
D.
Increase the queue depth for the given namespace.
A. Add the hosts to the subsystem with high priority
❌ Incorrect — Subsystem priority doesn’t control queue depth or I/O queue count. It affects access control, not performance tuning.
B. Decrease the QoS policy for the volumes that are in use by the namespaces
❌ Incorrect — Decreasing a QoS policy limits IOPS or throughput. That would further restrict performance, not enhance it.
C. Increase the QoS policy for the given namespace
⚠️ Partially correct — Increasing QoS limits can help, but it does not directly increase queue depth or queue count, which are transport-level parameters, not QoS-level.
D. Increase the queue depth for the given namespace
✅ Correct — For demanding database servers, increasing the queue depth allows more outstanding I/O requests per connection, directly improving throughput and reducing latency under load.
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