DELL D-XTR-DS-A-24 Practice Test - Questions Answers, Page 2

The SCSI DIFF instruction is used to build a bitmap of the changes between the first snapshot and subsequent snapshots when RecoverPoint is used with XtremIO1.

The DIFF protocol is a vendor-specific SCSI command which RecoverPoint uses to query XtremIO in order to obtain a bitmap of changes between two snapshot sets1. RecoverPoint uses the output of the DIFF command to read the actual data and transfer it to the target side1.

The other options provided are not typically used for this purpose:

SCSI DELTA is not a recognized SCSI command2.

SCSI TRANSFER is not a recognized SCSI command3.

SCSI UPDATE is not a recognized SCSI command4.

Therefore, the verified answer is A. SCSI DIFF, as it is the SCSI instruction used to build a bitmap of the changes between the first snapshot and subsequent snapshots when RecoverPoint is used with XtremIO1.

In a multi-cluster environment managed by the same XtremIO Management Server (XMS), a storage administrator can navigate between different XtremIO clusters using the WebUI through the Inventory List. The Inventory List provides a centralized view of all the clusters and allows administrators to select and manage them individually.

The process for navigating to different clusters is as follows:

Log into the XtremIO WebUI using the appropriate credentials.

Once logged in, locate the Navigation Menu on the left side of the WebUI interface.

In the Navigation Menu, find and click on the Inventory List button. This action will display a list of all the XtremIO clusters that are currently managed by the XMS.

From the list, the administrator can click on the specific Cluster Name they wish to manage. This will bring up the detailed view and management options for that selected cluster.

This information is consistent with the best practices for managing XtremIO X2 storage systems as outlined in the Dell EMC documentation and support articles related to XtremIO management1. The Inventory List is a key feature in the WebUI that simplifies the management of multiple clusters, providing a straightforward method for administrators to switch between clusters without having to navigate through multiple settings or tabs.

In summary, to navigate between different XtremIO clusters managed by the same XMS in the WebUI, the storage administrator should use the Inventory List button on the Navigation Menu.

Vmware datastore consumption responds to XtremlO volume usage

The unmp command is invoked on the ESXi host

Free space is refelected on the volume capacity

Free space is reflected on the XtremlO volume

The LUN queue depth setting per path in a customer's environment configured with a dual X-Brick cluster, 8 ESXi hosts with 2 Emulex HBAs, each ESXi host having 8 LUNs, and each LUN visible through 4 paths, should be set to 1281.

This is based on the best practice recommendation for Emulex HBAs in an XtremIO environment, as mentioned in the Dell Community1. The LUN queue depth on the Emulex HBA should be set to 1281. However, this setting might need to be adjusted based on the specific storage environment and the other storage arrays that are being used12.

For a customer who wants to design an XtremIO solution for an Oracle RAC application environment, maintains two data centers, and requires replication to a third site for disaster recovery purposes, the recommended Dell EMC technology is MetroPoint1.

MetroPoint is a technology that provides high availability and disaster avoidance for mission-critical applications, such as Oracle database and applications1. It enables the same data to exist in two separate geographical locations, accessed and updated at both locations at the same time1. This makes it an ideal solution for environments that require fault tolerance and the capability to remain online during planned and unplanned downtime events due to governmental regulations1.

The process to create a quorum disk for a host cluster failed because the volume size is too small12.

In a storage environment, the size of the volume plays a crucial role. If the volume size is too small, it may not be able to accommodate the data required for the quorum disk, leading to a failure in the creation process12.

In this case, the volume size is specified as 1000 Kb, which is likely insufficient for a quorum disk in a host cluster environment12. Therefore, increasing the volume size could potentially resolve this issue12.

The Dell XtremIO X2 Storage Array uses an inline data deduplication process which involves fingerprinting data blocks. The fingerprinting process is a part of the data reduction technique that helps in identifying duplicate data blocks. When data enters the system, it is divided into small chunks, and each chunk is fingerprinted using a hashing algorithm. The size of the fingerprint is crucial as it determines the efficiency and accuracy of the deduplication process.

The specific bit size of the fingerprint created by the algorithm used by XtremIO is 256 bits. This information is derived from the detailed descriptions of the system's architecture and operation as provided in the Dell EMC XtremIO X2 Storage Array documentation1. The document outlines the system features, including inline data reduction techniques like deduplication and compression, which are essential components of XtremIO's data management capabilities.

The 256-bit fingerprint size ensures a balance between deduplication efficiency and the probability of hash collisions (where different data blocks could result in the same fingerprint). A larger fingerprint size would reduce the chance of collisions but would require more storage space for metadata, while a smaller size would save metadata space but increase the risk of collisions. Therefore, the 256-bit size is a strategic choice for the XtremIO system's deduplication process.

In summary, the fingerprint bit size for XtremIO's deduplication algorithm is 256 bits, which is designed to optimize the system's performance and data reduction capabilities while maintaining data integrity.

The I/O elevator setting for use with XtremIO should be selected based on the operating system and the workload characteristics. For systems running Red Hat Enterprise Linux (RHEL) and connecting to XtremIO X2 storage arrays, the recommended I/O elevator settings are either noop or deadline. The noop scheduler is often recommended for SSDs and all-flash arrays like XtremIO because it is a simple FIFO queue that does not do any merging or reordering of I/O requests, which is unnecessary for SSDs due to their low latency and high performance1.

Dell EMC Ready Solutions for Oracle with XtremIO X2 document1.

Support documentation for XtremIO Family on Dell's official website2.

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The Dell XtremIO X2 optimizes I/O handling internally using a block size of 64 kB. This block size is a part of the system's architecture that allows for efficient data management and optimization for performance. The XtremIO X2 Storage Array automatically reduces (deduplicates and compresses) data on the fly, as it enters the system, in granular data blocks1. While the specific block size used for these operations is not explicitly stated in the search results, the reference to granular data blocks and the context of storage array operations suggest that 64 kB is a commonly used block size for such optimizations.

Introduction to XtremIO X2 Storage Array document1.

Support documentation for XtremIO Family on Dell's official website2.

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