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EMC E20-555 Practice Test Questions Answers

Exam Code: E20-555 (Updated 344 Q&As with Explanation)
Exam Name: Isilon Solutions and Design Specialist Exam for Technology Architects
Last Update: 12-Jul-2025
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  • Single Choice: 336 Q&A's
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    E20-555 Questions and Answers

    Question # 1

    -- Exhibit --

    A large manufacturing company is an existing Isilon customer with a cluster consisting of four NL400 nodes with 4TB drives. The cluster is using N+2:1 protection level and the file system shows that it is 60% utilized. Home directories and file shares comprise 75% of the existing content and the remainder is inactive deep archive. The company has 1,000 employees using Windows and Mac clients participating in a single Active Directory (AD) forest.

    During a meeting with the CIO and Director of IT you discuss the company’s recent acquisition – an engineering firm that specializes in Computer Aided Design (CAD). The engineering firm has 400 UNIX workstations that produce technical drawings which are currently stored on another vendor’s SAN solution. The all UNIX environment uses NIS for authentication and name resolution. They do not currently use DNS or LDAP. The engineering company has an old storage system that has been experiencing problems and the CIO would like you to migrate the data onto the Isilon cluster. The CIO would like to eliminate all tape and recover the data onto disk.

    The CIO is concerned about security of the company’s intellectual property, especially with the rapid adoption of mobile devices and external cloud content sharing services such as DropBox, Egnyte, and SugarSync. They would like to implement an alternative that provides external file sharing and mobile device synchronization while maintaining security control over the company’s data.

    The Director of IT reports that users are storing non-work related content on the Isilon cluster. They would like to limit the amount of capacity that each user can consume in their home directory and want to ensure you provide the capability to easily visualize which users are over their allotment.The company’s Windows users currently leverage Windows Shadow Copy to recover files that have been accidentally deleted. The IT department wants to ensure that Mac and incoming UNIX clients have the same functionality.

    The Director of IT also mentions that users are reporting slow response times when browsing their home directories and shared folders. They are concerned that Isilon cannot scale to support their combined requirements.

    -- Exhibit --

    Which configuration changes would you recommend for the Engineering users?

    A.

    Direct all clients to use the Manufacturing DNS server and connect NFS mounts to the FQDN of the Isilon cluster.

    B.

    Mount an NFS share to a node on the Isilon cluster, being careful to equally distribute the load across nodes.

    C.

    Utilize SMB2.1 protocol and mount to the Isilon cluster using the Name Server (NS) record IP.

    D.

    Create an FQDN for the Isilon cluster in the LMHOSTS file for each engineering system.

    Question # 2

    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.

    Question # 3

    In an Isilon environment, which event will avoid Dynamic IP Address reallocation?

    A.

    Client is added to the cluster

    B.

    Failure of the back-end network

    C.

    Node reboot

    D.

    Cluster split

    Question # 4

    Three jobs of different exclusion sets with a priority level of 5 are concurrently running on a cluster. A new job

    with a priority of 4 needs to be run.

    What does the Job Engine do?

    A.

    Pauses a priority 5 job and runs the new job until completion, then restarts the paused job from the

    beginning

    B.

    Pauses all priority 5 jobs and runs the new job until completion, then restarts the paused job

    C.

    Queues the old job of the same exclusion set until the job with a higher priority completes

    D.

    Runs the new job in parallel with the other running jobs

    Question # 5

    Which type of data is stored in Endurant Cache of an Isilon node?

    A.

    Write

    B.

    Volume

    C.

    Read

    D.

    Protection

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