When connecting a VMware cluster to an XtremIO array using QLogic Fibre Channel Host Bus Adapters (HBAs), the recommended value for the Execution Throttle is typically set to 4096. This setting controls the maximum number of outstanding I/O operations that can be sent to a Fibre Channel port.
Here's how to apply this setting:
Access HBA Settings: Log into the VMware host and access the settings for the QLogic Fibre Channel HBA.
Locate Execution Throttle: Find the parameter for the Execution Throttle within the HBA settings.
Set Value: Change the value of the Execution Throttle to 4096. This is the recommended setting to balance performance and resource utilization.
Save and Apply: Save the changes and apply them to the HBA. A reboot of the host may be required for the changes to take effect.
Verify Configuration: After the host is back online, verify that the new Execution Throttle setting is active and functioning as expected.
Monitor Performance: Monitor the performance of the host and the storage array to ensure that there are no adverse effects from the change.
Consult Official Documentation: For the most accurate and detailed instructions, always refer to the official Dell XtremIO Deploy Achievement document1. This document will provide the authoritative guidance on HBA settings and best practices for connecting to an XtremIO array.
It's important to note that while the value of 4096 is a common recommendation, the optimal setting may vary based on the specific environment and workload. Therefore, it's essential to refer to the latest Dell XtremIO documentation and possibly consult with Dell support for the most current and tailored advice.