Dell EMC Technology Architect, XtremIO Solutions Specialist E20-526 Exam Practice Test

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Total 67 questions
Question 1

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



Answer : A

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


Question 2

You have been asked to design an XtremIO storage array solution that will be used for two large applications workloads. One overload will generate approximately 150,000 write IOPs with an average 4 kB I/O size. The second write workload will have an average I/O size of 128 kB and will generate approximately 2 GB/s of throughput.

At a minimum, how many X-Bricks are needed in a single cluster to meet this requirement?



Answer : A

Second write workload IOPS = 2 GB/s divided by 128 kB = 2 x1,073,741,824 / (128 x 1,024) = 16384 IOPs.

Total IOPS required would be 150,000, from the first workload, plus 16384, totaling 166384.

A 2 X-Brick cluster provides 300K Read/write IOPS so it would be adequate.

Storage capacity and performance scale linearly, such that two X-Bricks supply twice the IOPS, four X-Bricks supply four times the IOPS, six X-Bricks supply six times the IOPS and eight X-Bricks supply eight times the IOPS of the single X-Brick configuration.

Note: 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 3

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



Answer : C


Question 4

Refer to the exhibit.

A customer has a VMware Horizon View environment with the following characteristics:

What is the maximum recommended number of VDIs the XtremIO cluster can support during a boot storm?



Answer : A

EMC estimates that 150 IOPS per desktop is required in a boot storm. As per table the recommended number of VDIs then is 243,831/ 150, which equals 1625.

References:https://www.emc.com/collateral/white-papers/h14279-wp-vmware-horizon-xtremio-design-considerations.pdf, page 32


Question 5

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?



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-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:


Question 6

Which actions are initiated when a snapshot is created on an XtremIO array?



Answer : A

When a copy is created, the volume's existing metadata becomes an 'ancestor' entity (parent object) that is shared between the production volume and the copy. New empty containers are created for subsequent changes to both the production volume and the virtual copy volume. Therefore, the act of creating a copy is instantaneous and involves no data or metadata copies.

References: https://www.emc.com/collateral/white-paper/h13035-wp-introduction-to-xtremio-snapshots.pdf, pages 18


Question 7

A customer is considering migrating their existing non-EMC storage arrays to an XtremIO array. The current environment consists of 350 servers running VMware ESXi 5.5 with 5000 virtual machines. The customer has various tools in place to monitor performance and collect statistics. On average, their service time is 32 ms and utilization is at 75%. In the past, the customer has had performance issues.

Based on Little's Law, what is the calculated response time on the existing environment?



Answer : A

Disk service time T(s) = 32 ms (service time for one I/O).

Response time T(r) is calculated as: T(s) / (1 -- Utilization), which here calculates to 32 ms/ (1-0.75) = 128 ms.

References:https://community.emc.com/thread/145100?tstart=0


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Total 67 questions