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EMC Isilon Design Specialist Exam for Technology Architects Sample Questions:

1. Your customer's initial use case was Home Directories. They implemented the cluster with four 1Gbps ports and LACP. They are planning to expand their cluster to support their core file services. They plan to upgrade their network infrastructure to 10 GbE to facilitate this.
What are two design impacts this change will have?

A) Dual 10GbE ports on each node will enable throughput of 20Gbps. Only connect half of the nodes to the network.
B) Maximum performance is obtained by only using a single 10GbE interface per node. LACP and multiple links may be used to increase redundancy, but will not provide more overall performance to the system
C) Maximum performance is obtained by only using a single 10GbE interface per node. Isilon can support up to 400MB/s per node
D) LACP and multiple links may be used to increase redundancy, but will not provide more overall
performance to the system.
FCoE should be considered for the External Network Ports on the nodes.

2. Your customer's site uses an old X-Series cluster, and they are interested in consolidating their two primary workflows. iostat shows that one of the applications is sensitive to latency, while isi statistics indicates sensitivity to disk response times. There are approximately 1000 users accessing 70 TB of file data.Which node type would you recommend?

A) X200
B) S200
C) X400
D) NL400

3. You meet with the IT Director of a large single site campus. The IT department has recently taken over Physical Security from the facilities department and plans a complete overhaul of the surveillance solution. They are looking to you as a storage architecture expert to provide the correct amount of storage needed. The IT Director asks you what items they need to provide in order to size this solution.What data do you require from the customer?

A) Video resolution Video CODEC Frames per second (fps) Number of devices Retention time
B) Bit rate per camera Camera manufacturer Video management system Retention time
C) Pixel count Video CODEC Color sampling Frames per second (fps) Number of devices Retention time
D) Pixel count Video CODEC Color sampling Frames per second (fps) Number of devices Video management system Evidence collection period

4. Refer to the exhibit.

You are analyzing a customer's existing Isilon environment using isi statistics in order to expand the cluster. When examining the protocol subcommand, you see the output as shown in the exhibit.
What does the data tell you about the workload?

A) It contains mostly random writes.
B) It is mostly sequential reads.
C) It is metadata intensive.
D) It uses large read requests.

5. You have 1000 users for an application that reads and writes files averaging between one and four MB in size. Each user requires 24 MB of RAM. You want to add another 1000 users for this application, and in preparation for them, you run the isi statistics command. You discover that the average CPU utilization is 20%; aggregate throughput averages 700 MB/s and the disk QueueD average is 1.5. Your cluster currently has five X200 (12 GB RAM, 1 TB drive) nodes, uses N+2:1 protection and 1 GigE networking.
What should you do to accommodate the next 1000 users?

A) Add five A100 (24 GB RAM) accelerator nodes.
B) Add five additional X200 (12 GB, 1 TB drive) nodes
C) Upgrade two of the 1 GigE NICs to 10 GigE on each node.
D) Upgrade each X200 node to a total of 24 GB of RAM.

Solutions: