E20-526 Online Practice Questions and Answers

Correct Answer: A

Large block I/O by nature incurs higher latency.

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

Correct Answer: B

EMC XTREMIO 4.0 SYSTEM SPECIFICATIONS

References: http://www.aecl.com/AECWeb/media/Assets/PDF/h12451-xtremio-4-system-specificationsss.pdf

Correct Answer: A

An example of a generic wrapper function that queries XtremIO REST API using HTTP/POST to create a new object with specified properties.

References: https://www.emc.com/collateral/white-papers/h14980-wp-accelerate-sql-lifecyclemanagement.pdf

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

Correct Answer: C

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

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

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

Correct Answer: D

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-xtremiosnapshots.pdf, page 14

Correct Answer: A

TPSTUN is a VAAI primitive that enables the array to notify vSphere when a LUN is running out of space due to thin provisioning over-commit. The command causes suspending all virtual machines on that LUN. XtremIO supports this VAAI primitive.

Incorrect Answers:

C: The XtremIO features for VAAI support include:

Clone Blocks/Full Copy/XCOPY

Used for copying or migrating data within the same physical array (VMware term:

HardwareAcceleratedMove).

On XtremIO, this allows VM cloning to take place almost instantaneously, without affecting user I/O on

active VMs.

D: The XtremIO features for VAAI support include: Zero Blocks/Write Same

Used for zeroing-out disk regions (VMware term: HardwareAcceleratedInit).

This feature provides accelerated volume formatting.

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

Correct Answer: C

IDC outlines a criteria some criteria for selecting a testing tool:

*

Generate workloads

*

Capture results for analysis: Throughput IOPS Latency

References: http://emc.co/collateral/technical-documentation/h15280-euc-xendesktop-vsphere-xtremiosg.pdf, page 87 http://info.xtremio.com/rs/xtremio/images/IDC_Flash_Array_Test_Guide.pdf, page 7

Correct Answer: D

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