EMC E20-526 Online Practice Questions and Exam Preparation

EMC E20-526 Online Questions & Answers

• Question 41:

  

  Refer to the Exhibit.

  A customer has the following XtremIO environment: Read/write ratio is 3:1 I/O size is 8K Write pattern is random Data is compressible

  If an application generates 100,000 IOPS of traffic, how many RPAs are needed to replicate the traffic from one XtremIO array to another XtremIO array over IP?

  A. 1
  B. 2
  C. 3
  D. 4
  C. 3

  ---

  Required bandwidth= 100,000 * 8 * 1024 bytes Provided bandwidth between XtremIO arrays with compression over Fiber Channel: 300 * 1024 * 1024 bytes

  Required number of RPAs: 100,000 * 8 * 1024 / (300 * 1024 * 1024) = 800,000 / (300 * 1024) = 2.6. Three RPAs would be enough.

• Question 42:

  A customer has a requirement to replicate their VDI to a newly purchased data center located 5 miles away. They require 10-day retention at each site and a continuous replication RPO. However, they want to have the same storage platform at each site. They have a limited budget but need to meet their requirements.

  Which solution should be recommended to the customer?

  A. XtremIO and OpenStack
  B. XtremIO with VPLEX and RecoverPoint
  C. XtremIO and RecoverPoint
  D. XtremIO and MirrorView/A replication
  C. XtremIO and RecoverPoint

  ---

  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).

  Native replication support for XtremIO

  The native replication support for XtremIO is designed for high-performance and low-latency applications that provides a low Recovery Point Objective of one minute or less and immediate RTO.

  The benefits include:

  Block level remote or local replication

  Asynchronous local and remote replication

  Policy-based replication to enable optimizing storage and network resources, while obtaining desired RPO and RTO

  Application-aware integration

  Incorrect Answers:

  A: OpenStack is the open platform for managing private and public clouds.

  B: XtremIO with VPLEX and RecoverPoint is a valid solution, but it would be more costly.

  References: Introduction to the EMC XtremIO STORAGE ARRAY (April 2015), page 52

• Question 43:

  What is a characteristic of the XtremIO Snapshot feature?

  A. Snapshots may be deleted in any order
  B. Snapshots can only be deleted in reverse creation order
  C. Only one snapshot may be created or deleted at a time
  D. Snapshots can be restored
  D. Snapshots can be restored

  ---

  Any copy in the hierarchy tree can be deleted without effecting the parents or children. Incorrect Answers:

  B: Deleting a snapshot in the middle of the tree triggers an asynchronous process. This process merges the metadata of the deleted entity's children with that of their grandparents. This ensures that the tree structure is not fragmented.

  C: It is possible to create copies of the production volumes in order to protect against logical data corruption. Multiple copies can be created over a short interval in order to provide a fine RecoverPoint Objective (RPO) in a cyclic manner (a superior RPO to a backup).

  References: https://www.emc.com/collateral/white-paper/h13035-wp-introduction-to-xtremio-snapshots.pdf, page 14

• Question 44:

  Which part of the XtremIO architecture do host ports use to access an XtremIO volume?

  A. FA
  B. Initiator
  C. Target
  D. Zone
  D. Zone

  ---

  All XtremIO's enterprise features (including Inline Data Reduction, snapshots, XDP, HA, etc.) have been developed as part of the scale-out architecture. All data and metadata are evenly distributed across the entire cluster. I/Os are admitted to the array via all the host ports, utilizing SAN zones and multi-pathing.

  References: Introduction to the EMC XtremIO STORAGE ARRAY (April 2015), page 39

• Question 45:

  When using a 10 TB single X-Brick, what is the minimum amount of data that should be written during the Fill phase of the PoC Toolkit?

  A. 10 TB
  B. 15 TB
  C. 20 TB
  D. 30 TB
  C. 20 TB

  ---

  Per IDC's best practices the toolkit fills the array 2x.

  References: https://community.emc.com/docs/DOC-35014

• Question 46:

  A customer has an existing Oracle environment they are considering moving over to XtremIO from VMAX for improved performance. The customer wants to know the expected deduplication and compression savings they can achieve with XtremIO.

  Which tool is appropriate for conducting this assessment?

  A. EMC Backup Tool
  B. EMC Storage Tool
  C. XtremIO Sizing Tool
  D. EMC MiTrend Tool
  D. EMC MiTrend Tool

  ---

  MiTrend has been available for EMC Employees and Partners for years, but it's a valuable tool that Customers can take advantage of also. And the price is awesome. It's FREE !

  Use it for VNX, Clariion, VMAX, and many more.

  References: http://www.pragmaticio.com/2014/11/mitrend-self-service-performance-analysis-for-emc-vnx/

• Question 47:

  What are common storage array mechanisms?

  A. Log structuring and RAID
  B. Post-processing and metadata logging
  C. RAID and metadata log structuring
  D. Metadata logging and RAID
  B. Post-processing and metadata logging

  ---

  XtremIO's snapshot technology is implemented by leveraging the content-aware capabilities of the system (Inline Data Reduction), optimized for SSD media, with a unique metadata tree structure. XtremIO leverages a proprietary flash-optimized data protection algorithm (XtremIO Data Protection or XDP), which provides performance that is superior to any existing RAID algorithm. References: Introduction to the EMC XtremIO STORAGE ARRAY (April 2015), page 33

• Question 48:

  You have worked with a customer to successfully evaluate their existing server environment using the MiTrend data analysis tool. You have collected the resulting reports and aggregated the data set. You determine the customer's application workload generates a 50:50 read/write ratio with an average of 500K IOPs during peak business hours.

  Which recommended XtremIO model meets the customer's needs?

  A. Starter X-Brick cluster
  B. Single X-Brick cluster
  C. Two X-Brick cluster
  D. Four X-Brick cluster
  D. Four X-Brick cluster

  ---

  

  References: https://store.emc.com/en-us/Product-Family/EMC-XtremIO-Products/EMC-XtremIO-All-Flash-Scale-Out-Array/p/EMC-XtremIO-Flash-Scale-Out

• Question 49:

  A customer has two XtremIO clusters running 3.x software release. The customer just purchased a new XtremIO array that will be installed with the latest 4.x software release. What is the minimum number of XtremIO Management Server(s) that will be required to manage all clusters?

  A. 1
  B. 2
  C. 3
  D. 4
  C. 3

  ---

  The system operation is controlled via a stand-alone dedicated Linux-based server, called the XtremIO Management Server (XMS). A single XMS can manage multiple clusters. Multiple cluster management is supported from version 4.0 and up. System version 4.0 supports up to eight clusters managed by an XMS in a given site.

  References: Introduction to the EMC XtremIO STORAGE ARRAY (April 2015), page 48

• Question 50:

  A new 500 GB VM disk is created on a database that resides on an XtremIO LUN. The VMware administrator plans to provision the disk using the thick provisioned eager zeroed format.

  How much physical XtremIO capacity will be allocated during this process?

  A. 5 GB
  B. 10 GB
  C. 50 GB
  D. None
  D. None

  ---

  XtremIO storage is natively thin provisioned, using a small internal block size. This provides fine-grained resolution for the thin provisioned space. All volumes in the system are thin provisioned, meaning that the system consumes capacity only when it is actually needed. XtremIO determines where to place the unique data blocks physically inside the cluster after it calculates their fingerprint IDs. Therefore, it never pre-allocates or thick-provisions storage space before writing.

  References: Introduction to the EMC XtremIO STORAGE ARRAY (April 2015), page 22