* Backup Policy and XtremIO Virtual Copy: The system administrator needs to ensure that the backup policy using XtremIO Virtual Copy (XVC) can store the required read-only copies without exceeding the storage limits.
* Calculating Days of Storage:
* 500 production volumes are backed up 4 times a day.
* Total copies created per day: 500 volumes * 4 backups/day = 2000 copies/day.
* Assuming the array can store a specific number of copies before older ones are deleted, let's determine the duration:
* Duration Calculation:
* If the array can store copies for 5 days, it can handle: 2000 copies/day * 5 days = 10,000 copies.
* Thus, the array can store the backup copies for 5 days before the original backups are deleted to make space for new ones.
References:
* Dell XtremIO 6.x User Guide
* XtremIO Virtual Copy and Protection Copies Features
* Dell XtremIO Deployment Services

Before presenting XtremIO volumes to a new Linux host, it is recommended to disable the I/O elevators. This step is crucial for optimizing performance and ensuring that the storage system works efficiently with the host's operating system.
The I/O elevator is a Linux kernel feature that controls the order in which I/O operations are submitted to storage devices. It's designed to optimize the way the Linux kernel handles write and read requests. However, in the context of high-performance storage systems like XtremIO, the default I/O scheduling might not be optimal. Disabling the I/O elevators allows the XtremIO storage system to manage the I/O requests more efficiently, leveraging its built-in capabilities for performance optimization.
This information is corroborated by the Official Dell XtremIO Deploy Achievement document, which outlines the best practices for configuring XtremIO systems in various environments, including Linux hosts1.

* VMware Horizon environments with linked clones require optimal storage configurations for performance and management.
* According to best practices, each datastore should handle a specific number of linked clones to avoid performance bottlenecks.
* For 1000 linked clones, it is recommended to have a minimum of 6 datastores to distribute the load evenly and maintain optimal performance.
References:
* Dell XtremIO Best Practices for VMware Horizon
* VMware Horizon Architecture Guide

* User ID Requirement: The installation of the XtremApp code requires specific user permissions.
* xinstall User: The xinstall user ID has the necessary permissions to perform installations and modifications on the XtremIO XMS and Storage Controllers.
* Installation Process: Using the xinstall user ensures that the process is completed without permission issues.
References:
* Dell XtremIO Installation Guide
* Dell XtremIO User Management Guide