EMC EMC Certifications E20-526 Questions & Answers

• Question 31:

  A storage administrator is adding both an XtremIO and third-party storage arrays to their existing infrastructure. The administrator is using ViPR SRM to monitor the environment.

  Which requirement is needed to implement this solution?

  A. A single third-party Solution Pack is required to manage both storage arrays

  B. Each storage needs its own Solution Pack

  C. Each storage array requires two Solution Packs; one for monitoring and one for performance

  D. A single XtremIO Solution Pack is required to manage both storage arrays

  Correct Answer: B

  References: https://www.emc.com/techpubs/vipr/understanding_solutionpacks-3.htm

• Question 32:

  What is considered typical performance for an XtremIO single X-Brick cluster?

  A. Small block writes: 200k-250k IOPs. Large block reads: up to 2.5 GB/s

  B. Small block writes: 200k-250k IOPs. Large block writes: up to 2.5 GB/s

  C. Small block reads: 200k-250k IOPs. Large block writes: up to 2.5 GB/s

  D. Small block reads: 200k-250k IOPs. Large block reads: up to 2.5 GB/s

  Correct Answer: C

  Choose an EMC XtremIO system and scale out linearly by adding more XtremIO X-Bricks.

  

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

• Question 33:

  An administrator receives an error on an XtremIO array while performing snapshot refreshes to a production volume. What is a potential cause for this issue?

  A. Refresh of the production volume is not supported

  B. Volume was not unmapped on the XtremIO cluster

  C. Only snapshot-to-snapshot refresh is supported

  D. Volume was not unmounted on the host

  Correct Answer: D

  The workflow for refreshing XtremIO Snapshots, containing Oracle Database files, consists of the following five simple steps:

  1.

  Shut down the database instances with files in the target Snapshot Set.

  2.

  Dismount the ASM disk group (or file systems) involved.

  3.

  Refresh the Snapshot via XtremIO GUI (or CLI or RESTful API).

  4.

  Mount the ASM disk groups (or file system) involved.

  5.

  Start the database instances.

  This entire workflow is measured in seconds (not minutes).

  Incorrect Answers:

  A: The refresh command is a powerful tool for test and development environments and for the offline processing use case. With a single command, a snapshot of the production volume or CG is taken and the SCSI face of the volume, which was mapped to the test and development application, is moved to it. This allows the test and development application to work on current data without the need to copy data or to rescan.

  References: https://www.emc.com/collateral/white-papers/h14485-xtremio-snapshot-refresh-oracledatabases.pdf, page 8

• Question 34:

  A customer is considering a six brick dispersed cluster using 3?0U racks. The customer wants advice on racking the InfiniBand switches. Rack 1 (left) contains X-Bricks 1 and 2 Rack 2 (middle) contains X-Bricks 3 and 4 Rack 3 (right) contains X-Bricks 5 and 6

  Which recommendation should be provided?

  A. Install the InfiniBand switches in Rack 1 with a 1U placeholder between the switches.

  B. Install an InfiniBand switch in Racks 1 and 3 with a 1U placeholder between the X-Bricks.

  C. Install the InfiniBand switches in Rack 2 with a 1U placeholder between the switches.

  D. Install the InfiniBand switches in Rack 3 with a 2U placeholder between the switches

  Correct Answer: B

• Question 35:

  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

  Correct Answer: C

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

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

• Question 36:

  A customer has a workload with the following attributes: Generates 250,000 IOPs 100 TB in logical capacity Read/Write ratio of 1:1 Random workload with 8 kB I/O size Deduplication ratio of 2:1 Compression ratio of 2:1

  Which XtremIO solution should be recommended to the customer?

  A. 1×40 TB X-Brick

  B. 2×10 TB X-Brick

  C. 3×20 TB X-Brick

  D. 4×10 TB X-Brick

  Correct Answer: C

  XtremIO clusters with 60 TB of physical usable flash capacity can now logically support 360 TB or more of capacity at typical 6:1 data reduction (deduplication plus compression) ratios. Here we have a 4:1 reduction ratio, so 25 TB would be enough. The 250,000 IOP requirments indicates that we need at least two Bricks.

  

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

• Question 37:

  Which SCSI instructions are used to build a bitmap of the changes between the first snapshot and subsequent snapshots when RecoverPoint is used with XtremIO?

  A. SCSI Delta

  B. SCSI Transfer

  C. SCSI DIFF

  D. SCSI Update

  Correct Answer: C

  DIFF protocol - A vendor specific SCSI command which RecoverPoint uses to query XtremIO with in order

  to obtain a bitmap of changes between two snapshot sets.

  RecoverPoint uses the output of DIFF command to read the actual data and transfer it to the target side.

  References: EMC RECOVERPOINT REPLICATION OF XTREMIO, Understanding the essentials of

  RecoverPoint Snap-based replication for XtremIO, page 9 https://www.emc.com/collateral/white-papers/

  h14296-wp-recoverpoint-replication-of-xtremio.pdf

• Question 38:

  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

  Correct Answer: C

  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-intime 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 39:

  You need to design a VDI solution for a customer. Which best practices should be used for VDI environments?

  A. Align data on 4 kB boundaries. Put persona and user data on XtremIO LUNs

  B. Align data on 4 kB boundaries. Allocate multiple XtremIO LUNs to each host

  C. Align data on 8 kB boundaries. Put the master VM image on an XtremIO LUN

  D. Align data on 8 kB boundaries. Put all VDI-related data on one large LUN

  Correct Answer: C

• Question 40:

  A customer has the following requirements for their VDI deployment: Greater than 1000 desktops with the ability to grow 10% for the next 3 years Low latency boot volumes General purpose NAS for home directories Remote replication with the ability to snap at every write Capable of delivering 100 IOPs per desktop

  Which EMC technologies should be recommended?

  A. XtremIO, RecoverPoint CRR, and VPLEX only

  B. VSPEX Blue, RecoverPoint CDP, and VNX

  C. Isilon, VSPEX Blue, VPLEX, and RecoverPoint CDP

  D. XtremIO, RecoverPoint CRR, VPLEX, and Isilon

  Correct Answer: A

  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-intime data recovery and a new "snap and replicate" mechanism for local and remote replication (XRP).

  Splitter-based replication, using VPLEX RecoverPoint splitter-based replication provides synchronous replication, continuous replication with fine recovery granularity (journal based), and replication for active-active datacenters.

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