For an XtremIO X2 dual X-Brick cluster configuration without a physical XMS installed, the total number of power connectors required in a customer rack is 8. This is based on the system specifications which state that a 2 Brick Cluster requires 16 x IEC C14 power sockets1. Since the physical XMS would typically require additional power sockets, and it is not included in this configuration, the total number of power connectors needed would be less than the specified 16.
Here's the breakdown:
Each X-Brick in a dual X-Brick configuration would require power for its controllers and DAEs.
The InfiniBand switches included in a multi X-Brick system would also require power.
Without the physical XMS, which would normally need its own power connectors, the total comes down to 8 connectors required for the dual X-Brick setup1.

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.

* Failed Cluster Creation: When a cluster creation fails, logs need to be collected for troubleshooting.
* Debug Command: Running the create-debug-info debug-info-name=initial setup command helps in collecting the necessary logs for analysis.
* Log Bundle Collection: This command gathers all relevant information needed to diagnose and fix the cluster creation issue.
References:
* Dell XtremIO Command Reference Guide
* Dell XtremIO Troubleshooting Guide

In an Oracle environment integrated with XtremIO, it is a best practice to increase the queue depth and execution throttle to the maximum values supported by the HBA (Host Bus Adapter) drivers. This configuration helps to optimize the performance by allowing more I/O operations to be processed simultaneously, which is crucial for handling the demanding workloads typically associated with Oracle databases. References := Dell Deployment Services

Leaving one rack unit open at the bottom of a rack containing an XtremIO X2 is a practice recommended for allowing more efficient cooling. This space acts as a buffer zone, helping to facilitate better airflow and prevent the recirculation of hot air within the rack. It is a part of thermal management strategies in data centers to optimize the cooling systems, which are crucial for maintaining the performance and longevity of the equipment1.
The Dell Best Practices Guide for Rack Enclosures emphasizes the importance of proper cooling and airflow management within rack enclosures. It suggests that efficient cooling can help reduce inefficiencies at the rack level and is essential for maintaining the necessary thermal environment for rack-mounted equipment1. While the guide does not explicitly mention leaving a rack unit open at the bottom, the principle of optimizing airflow for cooling purposes is consistent with the practice.