The RESTful API method used to retrieve an existing configuration from a system like XtremIO is the HTTP GET methD. The GET method is used to request data from a specified resource and is one of the most common HTTP methods used in RESTful APIs1.

In the context of the XtremIO REST API, the GET method would be used to access various types of information about the array's configuration. For example, to retrieve details about the volumes configured on an XtremIO array, you would issue a GET request to the appropriate endpoint of the XtremIO REST API2.

The HTTP POST method, on the other hand, is typically used to send data to the server to create or update a resource. The terms HTTP RETRIEVE and HTTP GATHER are not standard RESTful API methods and are not used in the context of the XtremIO REST API or any RESTful API1.

In a heterogeneous environment with multiple storage arrays connected to VMware vSphere, setting Disk.SchedQuantum to 64 is recommended.

This setting optimizes the scheduling of I/O requests and helps in balancing the load across different storage arrays.

Proper configuration of Disk.SchedQuantum enhances the performance and efficiency of the storage environment.

VMware Best Practices for Storage

Dell XtremIO VMware Integration Guide

A single XtremIO Management Server (XMS) can manage up to 8 X-Brick clusters.

For 20 XtremIO X1 clusters, the smallest number of XMS servers required to support the environment is 4.

Consolidating management operations to the minimum number of XMS servers helps in simplifying administration and monitoring tasks.

Dell XtremIO XMS Configuration Guide

XtremIO Cluster Management Documentation

In addition to PowerPath, the supported multipathing software for VMware ESXi hosts connecting to XtremIO is Native Multipathing (NMP).

NMP is integrated with VMware and provides basic multipathing capabilities, allowing for path redundancy and load balancing.

Properly configuring multipathing is crucial for achieving high availability and optimal performance in a VMware environment with XtremIO storage.

Dell EMC Host Connectivity Guide for VMware ESXi

XtremIO Multipathing Configuration Documentation

The iostat command is used for monitoring system input/output device loading by observing the time the devices are active in relation to their average transfer rates. It generates reports that can be used to change system configuration to better balance the input/output load between physical disks1. The iostat command is particularly useful for monitoring disk throughput and can help identify high disk utilization, which is essential for diagnosing performance issues related to storage2.

The iostat command provides information about input/output (I/O) statistics for block devices (like hard drives and SSDs) and CPUs, making it a valuable tool for analyzing the performance and usage of these resources on a system1. It is distributed as part of the sysstat package and is available on most Linux distributions1.

The other commands listed have different purposes:

stat (OA) is used to display file or file system status.

netstat (OB) displays network connections, routing tables, interface statistics, masquerade connections, and multicast memberships.

nbtstat (OC) is a Windows command-line utility that displays protocol statistics and current TCP/IP connections using NetBIOS over TCP/IP.

Therefore, for monitoring the performance of system input/output devices on Linux/UNIX systems, iostat (OD) is the correct command to use1.