E20-555 EMC Exam Questions and Free Practice Test

Question 13

A customer is inquiring about expanding their primary cluster consisting of six S-Series nodes in order to improve performance. They have a second cluster with 11 X-Series nodes. Both clusters leverage 1GbE, but the customer recently installed a 10GbE network that can be utilized. They also have multiple Fibre Channel SAN arrays in their environment.
They have a variety of workloads on each cluster and are in the process of determining which workloads belong on which cluster. They have discovered that one of the workloads- a SQL database that resides on the X-Series node cluster - is experiencing timeouts due to latency. The database vendor has suggested limiting latency to 5ms or less to eliminate these timeouts.
How do you advise the customer?

A. Consider migrating data from Isilon to one of their SAN platforms or proposing a new solution to handle the performance requirements of SQL.

B. Merge the S-Series nodes and X-Series nodes into one cluster, upgrade the 1GbE to 10GbE, and leverage SmartPools to allow for the cluster to determine where data should reside.

C. Suggest the customer consider leveraging SSDs in the new nodes they purchase and GNA to boost the performance of each cluster.

D. Recommend they increase the amount of DRAM in the cluster or consider an Accelerator node in order to increase the amount of cache in their cluster.

Correct Answer:A

Question 14

A customer has grown 2 PB in the last year. The cluster performs well most times of the day, but occasionally during the day, the customer notices a decrease in performance. You have been told that ‘tree-deletes’ are taking too long and can only be run on weekends.
What would you recommend to speed up the ‘tree-deletes’?

A. Add an SSD node tier for metadata to account for at least 2% of RAW capacity

B. Use an A100 node for added CPU performance to help with ‘tree-deletes.’

C. Add 20% more nodes to the cluster to help with degraded performance.

D. Add an SSD tier for metadata, ensuring all nodes have SSDs.

Correct Answer:A

Question 15

What is a Shadow Store used for in Isilon OneFS?

A. Shared data for clones and original files

B. Changed block data for clones and original files

C. Changed block data for SyncIQ

D. Changed blocks for SnapshotIQ

Correct Answer:A

Question 16

Your customer has an Isilon 4-node X400 cluster used for home directory use, and has since updated to OneFS 7.1. The HR and Legal departments have been very strict about using only dedicated file servers that are part of a single, isolated, untrusted Active Directory domain. Their filer has been out of maintenance, and fears are being raised that, due to the age, it may fail at some point.
What could the IT department do, to allow the HR and Legal groups to provide file share services, with minimal impact to their other application permissions?

A. Recommend a 2nd cluster for the HR/Legal department

B. Utilize SmartPools to create two pools to separate the domains

C. Consolidate onto a single cluster and merge the domains

D. Use Access Zones for each domain

Correct Answer:B

Question 17

When designing Isilon solutions, what issues should you pay special attention to?

A. Avoid being too enthusiastic over the technologyBalancing technical and business requirementsProvide OptionsDesign to meet customer expectations

B. Workflow DocumentSolutions DocumentApplication typesData strategy

C. Solutions DocumentBalancing technical and business requirementsProviding many optionsPractical v

D. theoretical implementations

E. Solutions DocumentBalancing technical and business requirementsDownstream hand-offDesign to meet customer expectations

Correct Answer:A

Question 18

A potential customer requires 800 TB of usable capacity to store medical images for their network of health clinics. The IT department has limited staff and currently manages four storage arrays from other vendors. During a meeting with the Director of IT you learn that the company is considering a solution from a competitor of EMC using two of the existing arrays and two new arrays.
Which Isilon capabilities would show a better ROI for the customer?

A. Isilon has 6%-12% less filesystem overhead than traditional clustered filesystem solutions.With a single filesystem and virtual capacity for drive and node failures, Isilon utilization is typically 80% or higher.Isilon utilization is typically 80% or higher due to use of a single filesystem and virtual capacity for drive and node failures.

B. With a single filesystem and virtual capacity for drive and node failures, Isilon utilization is typically 80% or higher.OneFS compression results in higher effective capacity within the cluster.Traditional clustered filesystems require 4%-10% internal overhead compared to Isilon virtual capacity.

C. Forward Error Correction overhead is 7% lower than traditional RAID.Isilon has 6%-12% less filesystem overhead than traditional clustered filesystem solutions.According to an IDC study, Isilon improves IT productivity by nearly 50% compared to traditional competitors.

D. Isilon has 15%-20% less overhead than traditional clustered filesystems.According to an IDC study, Isilon utilization is nearly 50% higher than traditional competitors.Isilon QOS headroom and multiple node pools ensures consistent performance up to 80% utilization.

Correct Answer:A

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