SG0-001 · Question #302
What is the primary reason for making an adjustment to the queue depth?
The correct answer is A. number of LUNs presented to the HBA changes. Adjusting the queue depth is primarily done to optimize performance and prevent bottlenecks when the number of LUNs presented to a Host Bus Adapter (HBA) changes.
Question
What is the primary reason for making an adjustment to the queue depth?
Options
- Anumber of LUNs presented to the HBA changes
- Baverage size of I/O blocks going through the HBA changes
- Cread/write ratio of I/O going through the HBA changesread/write ratio of I/O? going through
- Dsize of cache on the storage system changes
How the community answered
(30 responses)- A93% (28)
- C3% (1)
- D3% (1)
Why each option
Adjusting the queue depth is primarily done to optimize performance and prevent bottlenecks when the number of LUNs presented to a Host Bus Adapter (HBA) changes.
The queue depth, which determines how many I/O commands an HBA can process concurrently, needs adjustment when the number of LUNs changes to ensure optimal I/O throughput and prevent either underutilization or overload of the HBA. Each LUN added or removed can impact the total I/O requests an HBA is expected to handle.
While I/O block size can influence performance, it does not directly necessitate an adjustment to the HBA's queue depth, which is more about the number of outstanding commands.
The read/write ratio impacts storage system performance but does not directly dictate a change to the HBA's queue depth setting.
Storage system cache size affects the overall storage array's performance but is independent of the HBA's queue depth configuration.
Concept tested: HBA queue depth adjustment reasons
Source: https://docs.broadcom.com/doc/BCM573xx-VMware-vSphere-Best-Practices-Guide
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