EMC E20-526 Online Practice Questions and Exam Preparation

EMC E20-526 Online Questions & Answers

• Question 51:

  Based on XtremIO best practice, which byte sector size should be used for volumes hosting Oracle database files?

  A. 256
  B. 512
  C. 1024
  D. 4096
  D. 4096

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  Architecting a database on an All Flash Array (AFA) like EMC's XtremIO is best done by reviewing practices to optimize I/O performance. One consideration is the use of Advanced Format and how it impacts the performance of the database Redo logs. Advanced Format refers to a new physical sector size of 4096 bytes (4KB) replacing original 512 byte standard.

  References: https://community.emc.com/community/connect/everything_oracle/blog/2014/07/18/xtremio-best-practices-advanced-format-512e-and-native-modes

• Question 52:

  A customer has a large ESX server environment they are considering deploying to XtremIO for a VDI implementation. To determine a baseline of the environment, you are proceeding with documenting each server's CPU, NIC, and disk utilization statistics. The customer has provided you with direct CLI access to the servers to conduct this assessment.

  Which utility should be used to monitor these performance parameters?

  A. esxtop
  B. resxtop
  C. top
  D. iostat
  B. resxtop

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  resxtop is a command to retrieve performance statistics. This command is included in vSphere command line interface (CLI) and is part of the vSphere Management Assistant (vMA), which is an equivalent to esxtop that runs only inside an ESX service console.

  Incorrect Answers:

  A: esxtop runs only inside an ESX service console.

  D: Use the iostat command to report statistics about disk input and output, and to produce measures of throughput, utilization, queue lengths, transaction rates, and service time. References: www.emc.com/collateral/TechnicalDocument/docu5265.pdf, page 22

• Question 53:

  When installing a physical XtremIO Management Server (XMS) station, which requirement must be met?

  A. XMS must be able to access one of the management ports on one X-Brick storage controller in the cluster
  B. XMS must be able to access only the management ports on the first X-Brick's storage controllers
  C. XMS must be able to access all management ports on the X-Brick storage controllers
  D. XMS must be able to access all management ports on at least two X-Brick storage controllers in the cluster
  C. XMS must be able to access all management ports on the X-Brick storage controllers

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  The XMS must access all management ports on the X-Brick Storage Controllers, and must be accessible by any GUI/CLI client host machine. References: Introduction to the EMC XtremIO STORAGE ARRAY (April 2015), page 48

• Question 54:

  When using the XtremIO PoC Toolkit, what is the purpose of the Age phase?

  A. Continuously write to a specific range of logical block addresses to test Flash durability
  B. Overwrite each LUN multiple times to ensure they contain all unique data
  C. Test the performance of the All-Flash array with non-production static data
  D. Scatter writes across the entire array to simulate ordinary use of the system
  D. Scatter writes across the entire array to simulate ordinary use of the system

  ---

  Proceed with filesystem aging by doing random overwrite cycles.

• Question 55:

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

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  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-Flash-Scale-Out-Array/p/EMC-XtremIO-Flash-Scale-Out

• Question 56:

  A customer's storage administration team wants to receive e-mail notifications when the XtremIO cluster detects an issue of major seventy. The customer has successfully configured and tested the e-mail server in the XtremIO GUI. However, the e-mail server is not receiving the expected notifications when major severity issues appear.

  What is the cause of this issue?

  A. Alert definitions have not been defined
  B. Event handlers have not been defined
  C. Public reports have not been defined
  D. Private reports have not been defined
  A. Alert definitions have not been defined

• Question 57:

  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
  A. XtremIO, RecoverPoint CRR, and VPLEX only

  ---

  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).

  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

• Question 58:

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

• Question 59:

  A physical XtremIO Management Server (XMS) has failed and requires replacement. Which two software packages are required for recovery?

  A. XMS image and OVA image
  B. Xtremapp and OVA image
  C. XMS image and Xtremapp
  D. Xtremapp and MPIO
  C. XMS image and Xtremapp

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  The first step is to re-install the XMS image, in the event it is a physical XMS then you may install an image via a USB flash drive or for a virtual XMS simply deploy the provided VMware OVA image. The following step is to upload the XMS software to the images directory of the XMS and login with install mode ........

  Once logged into the XMS console with xinstall then perform the following sequence of steps:

  1. Configuration

  5. Perform XMS installation only

  11. Run XMS Recovery

  

  Options to choose when running the "XMS Recovery":

  

  References: https://davidring.ie/2015/02/20/emc-xtremio-redeploying-xms-xtremio-management-server/

• Question 60:

  A customer has recently purchased an XtremIO 10 TB single X-Brick cluster for an implementation of Oracle RAC. The customer wants your help with integrating Oracle with their new XtremIO cluster. The customer has three DATA disk groups, two REDO disk groups, and four FRA disk groups.

  How many XtremIO LUNs should be assigned to the FRA disk groups?

  A. 2
  B. 4
  C. 6
  D. 8
  D. 8

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  Best practice is to use four LUNs for the DATA disk group to allow the host to use simultaneous threads. The REDO and FRA disk groups should use two LUNs each. References: https://community.emc.com/community/connect/everything_oracle/blog/2016/03/31/best-practises-of-vblock-on-xtremio-with-oracle-databases-part-i