EMC E20-526 Online Practice Questions and Exam Preparation

EMC E20-526 Online Questions & Answers

• Question 31:

  When using XtremIO storage with Solaris (SPARC), what is the EMC recommended I/O size that will deliver sequential I/O more efficiently to XtremIO?

  A. 1 MB
  B. 2 MB
  C. 4 MB
  D. 8 MB
  C. 4 MB

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  EMC recommended setting for Solaris include that the /etc/system file be modified to include the following parameter:

  * Set maximum IO size

  set maxphys = 0x400000

  This also requires increase of the maximum I/O size for the disk driver. The corresponding entry and file for this change are different for different Solaris versions, as follows:

  For Solaris 10 (SPARC):

  File: /kernel/drv/ssd.conf

  Setting: ssd_max_xfer_size=0x400000;

  For Solaris 10 (x86):

  File: /kernel/drv/sd.conf

  Setting: sd_max_xfer_size=0x400000;

  Etc.

  References: EMC Host Connectivity Guide for Oracle Solaris, page 167 https://www.emc.com/collateral/TechnicalDocument/docu5132.pdf

• Question 32:

  A customer is interested in transitioning their traditional infrastructure to the Cloud by implementing ViPR software-defined storage in an XtremIO environment. Which capabilities will EMC ViPR software-defined storage provide to XtremIO?

  A. Delivers SaaS Centralized management and monitoring Chargeback and billing capabilities
  B. Chargeback reporting capability Centralizes reactive monitoring capability Policy-driven configuration management
  C. Automatically grows storage volumes Slows growth of data Centralized auto-deletes of aging files
  D. Creates virtual storage pools Automates disaster recovery Replaces chargeback capabilities
  A. Delivers SaaS Centralized management and monitoring Chargeback and billing capabilities

  ---

  EMC ViPR Controller is a software-defined storage platform that abstracts, pools and automates a data center's underlying physical storage infrastructure. It provides data center administrators with a single control plane for heterogeneous storage systems.

  ViPR enables software-defined data centers by providing features including:

  * Comprehensive and customizable platform reporting capabilities that include capacity metering, chargeback, and performance monitoring through the included ViPR SolutionPack

  References: Introduction to the EMC XtremIO STORAGE ARRAY (April 2015), page 60

• Question 33:

  An XtremIO administrator is having a problem with performance and is troubleshooting the issue. What is an accurate statement about I/O transfers?

  A. As I/O size increases, IOPs increase, and latency increases
  B. As I/O size increases, IOPs decrease, and bandwidth increases
  C. As I/O size decreases, IOPs increase, and bandwidth increases
  D. As I/O size decreases, IOPs decrease, and latency increases
  A. As I/O size increases, IOPs increase, and latency increases

  ---

  Large block I/O by nature incurs higher latency.

  References: Introduction to the EMC XtremIO STORAGE ARRAY (April 2015), page 6

• Question 34:

  You are designing an XtremIO solution for a potential customer. If the server and storage information is available, which information should be documented regarding the customer's capacity expectations?

  A. Capacity requirements on a per data center basis Expandability/scalability Performance requirements determined on a server-to-server basis
  B. Capacity requirements on a per volume basis Expandability/scalability Performance requirements determined on a server-to-server basis
  C. Capacity requirements on a per volume basis Compression rates/scalability Performance requirements determined on a server-to-server basis
  D. Capacity requirements on a per data center basis Expandability/scalability Performance requirements determined holistically
  B. Capacity requirements on a per volume basis Expandability/scalability Performance requirements determined on a server-to-server basis

• Question 35:

  What is the maximum speed of the Fibre Channel ports on an XtremIO storage controller?

  A. 2 Gb/s
  B. 4 Gb/s
  C. 8 Gb/s
  D. 16 Gb/s
  C. 8 Gb/s

  ---

  Each Storage Controller includes two 8Gb/s Fibre Channel (FC) ports.

  References: Introduction to the EMC XtremIO STORAGE ARRAY (April 2015), page 8

• Question 36:

  Based on best practice, what is the maximum number of paths a host should have to an XtremIO volume?

  A. 4
  B. 8
  C. 16
  D. 32
  C. 16

  ---

  The recommended maximum number of paths to storage ports per host is 16 as per the table below.

  

  References: https://www.emc.com/collateral/white-papers/h14475-wp-xtremio-brocade-best-practices.pdf?isPublic=false , page 12

• Question 37:

  A customer has a VMware vSphere environment running Native Multipathing (NMP). Which path selection policy should be set for optimal performance when connected to an XtremIO cluster?

  A. Fixed AP
  B. Most Recently Used
  C. Fixed
  D. Round Robin
  D. Round Robin

  ---

  Configuring vSphere Native Multipathing.

  For best performance, it is recommended to do the following:

  Set the native round robin path selection policy on XtremIO volumes presented to the ESX host.

  References: https://itzikr.wordpress.com/2015/12/16/host-configuration-for-vmware-vsphere-on-emc-xtremio/

• Question 38:

  Which level of granularity does XtremIO deduplication run?

  A. Variable 8 kB
  B. Variable 32 kB
  C. Fixed 8 kB
  D. Fixed 32 kB
  C. Fixed 8 kB

  ---

  EMC XtremIO(All-Flash) : SAN, inline deduplication, 8K fixed chunk size; References: https://www.linkedin.com/pulse/deduplication-fake-reality-mike-uzan

• Question 39:

  A customer is interested in purchasing XtremIO for their mission critical database applications that require the lowest possible response times. They have two data centers in which they want to introduce All-Flash arrays. However, they need a way to maintain true active/active access to all databases and application LUNs across both sites.

  What is the recommended solution to address the requirements?

  A. ViPR Controller with XtremIO
  B. RecoverPoint with XtremIO
  C. VPLEX Metro with XtremIO
  D. ViPR SRM with XtremIO
  C. VPLEX Metro with XtremIO

  ---

  The EMC VPLEX family is the next-generation solution for data mobility and access within, across and between data centers. VPLEX supports two configurations, local and metro. In the case of VPLEX Metro with the optional VPLEX Witness and Cross-Connected configuration, applications continue to operate in the surviving site with no interruption or downtime. Storage resources virtualized by VPLEX cooperate through the stack, with the ability to dynamically move applications and data across geographies and service providers.

  Incorrect Answers:

  A: EMC ViPR Controller is a software-defined storage platform that abstracts, pools and automates a data center's underlying physical storage infrastructure. It provides data center administrators with a single control plane for heterogeneous storage systems.

  B: The EMC RecoverPoint family provides cost-effective, local continuous data protection (CDP), continuous remote replication (CRR), and continuous local and remote replication (CLR) that allows for any-point-in-time data recovery and a new "snap and replicate" mechanism for local and remote replication (XRP). This enables replication for high-performance, low-latency applications.

  D: EMC ViPR SRM provides comprehensive monitoring, reporting and analysis for heterogeneous block, file and virtualized storage environments. It enables the users to visualize applications to storage dependencies, monitor and analyze configurations and capacity growth, and optimize their environment to improve return on investment.

  References: Introduction to the EMC XtremIO STORAGE ARRAY (April 2015) , page 63

• Question 40:

  Based on XtremIO Data Protection, how many dedicated hot spare disks per X-Brick are required?

  B. 1
  C. 2
  D. 3
  A

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  XtremIO Data Protection (XDP) doesn't require any configuration, nor does it need hot spare drives. Insteadit uses "hot spaces" ?free space in the array. References: https://www.emc.com/collateral/white-paper/h13036-wp-xtremio-data-protection.pdf , page 23