Expert Answers to EMC Exam E20-555 Questions

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EMC Certification Isilon Solutions and Design Specialist Exam for Technology Architects

Isilon Solutions and Design Specialist Exam for Technology Architects

Last Update Apr 4, 2026
Total Questions : 344

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Questions 2

When planning a new cluster using backend leaf-spine topology, what is the maximum number of nodes

supported when using two leaf switches and one spine switch?

Options:

144

Discussion 0

Questions 3

An Isilon customer experienced a node failure. The failure requires that the affected node be permanently removed from the cluster. What will occur in the cluster upon failure of the node?

Options:

OneFS will assume it is a temporary failure and the data will not be protected at the appropriate levels.

Cluster will detect the node failure and automatically begin the SmartFail process.

FlexProtect will be activated and data will be protected at the appropriate levels.

Nothing. When data protection levels are set appropriately, OneFS will always protect data without manual interaction.

Discussion 0

Questions 4

An architect is designing a solution for a new customer. The customer is going to use the cluster to store a

large number of files that will be accessed by many users.

What IO optimization should be used and what kind of prefetching will take place?

Options:

Concurrency, aggressive prefetching

Random, aggressive prefetching

Concurrency, moderate prefetching

Concurrency, no prefetching

Discussion 0

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Questions 5

An existing customer has two NAS systems providing NFS storage in their main datacenter - one is an Isilon cluster and the second is an array from another vendor. Both systems are four years old, and the customer would like to consolidate the storage into a single solution. According to the customer, both systems support identical workloads with similar performance and utilization, and they want the new solution to support 50% performance growth.

Which method can model the workload requirements, and what multiplier will capture the requirements for the new solution?

Options:

Use isi statistics protocol, and multiply by 3

Use isi statistics drives, and multiply by 1.5

Use isi statistics query, and multiply by 2

Use isi statistics system, and multiply by 3

Discussion 0

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