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EMC E20-555 Exam - Cheat-Test.com

Free E20-555 Sample Questions:

Q: 1
You are called into an opportunity, you would like to get more information on the data skew of the filer. The customer has a supported filer.
What assessment tool would you use to generate this information?
A. Workload Profile
B. Workflow Proflie
C. lnsightlQ
D. SupportlQ
Answer: A

Q: 2
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.
Answer: A

Q: 3
A customer has eight X400 24GB RAM that supports 400 client connections today The customer plans to add 400 more clients in the next few months. They are looking at adding an A-Series node to the cluster to help with client connections.
Before they start adding client connections, what hardware change do you recommend?
A. Add RAM to offset concurrent client connections
B. Add an A100 to offset concurrent client connections
C. Add nodes with SSD to help with connections
D. Add more network switches to increase the number of connections
Answer: A

Q: 4
You are asked to size a cluster for a file sharing environment. nfsstat indicates that no more than 10% of the requests are namespace operations (e.g. GETADDR, SETADDR). There will be 10,000 active Linux users, connecting over NFS.
Which cluster configuration would you recommend?
A. Ten X200 (27 TB) 48 GB RAM, 600 GB SSD, N+2:1
B. Five X400 (120 TB) 96 GB RAM, 2.4 TB SSD, N+2
C. Ten X400 (60 TB) 48 GB RAM, 2.4 TB SSD, N+2:1
D. Eight X200 (36 TB) 24 GB RAM, no SSD, N+2:1
Answer: A

Q: 5
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. S200
B. X400
C. X200
D. NL400
Answer: A

Q: 6
A customer is making a decision between lsilon and a competitor's offering. They currently have 100TB of usable capacity and are forecasting 100% growth per year for the next three years, which will require them to lease additional space in their co-located data center. The CFO finds ROl and TCO to be important decision criteria.
Which statement best emphasizes the value of lsilon for this customer?
A. lsilon's OneFS data protection policies offer substantially lower overhead than competitive RAlD based NAS solutions.
B. An lDC study found that lsilon requires 95% less down time hours per year compared to other competitors.
C. The competition cannot offer a scale-out NAS so as capacity is added to the array, performance may degrade.
D. lsilon's OneFS allows administrators to manage much larger amounts of capacity than competitive offerings.
Answer: A

Q: 7
A potential customer requires 4 PB of usable capacity to store media files. The workloads are a combination of streaming video delivery and long term archive of video assets.
There is very little space available in the customer's datacenter, so physical density is very important. The customer is concerned about performance impact and potential data loss when using 3 TB or larger drives.
What lsilon capabilities can address the customer's concerns?
A. lsilon does not perform rebuilds - data reprotection is typically 2x-3x faster than traditional RAlD rebuilds.
N+3 and N+4 Protection Levels exceed traditional RAlD6 availability. Data redistribution runs faster with more nodes in the cluster.
B. N+3 and N+4 Protection Levels exceed traditional RAlD6 availability. Proactive hot sparing eliminates most drive rebuilds.
Endurant Cache reduces the overhead for write operations.
C. lsilon does not perform rebuilds - data reprotection is typically 2x-3x faster than traditional RAlD rebuilds.
Data recovery is consistent, taking the same amount of time regardless of cluster size. lsilon 'short strokes' 4TB drives to reduce rebuild time.
D. lsilon nodes have more drives per rack unit so fewer shelves are required. Proactive hot sparing eliminates most drive rebuilds.
N+3 and N+4 Protection Levels exceed traditional RAlD6 availability.
Answer: A

Q: 8
A potential customer requires 800 TB of usable capacity to store medical images for their network of health clinics. The lT department has limited staff and currently manages four storage arrays from other vendors. During a meeting with the Director of lT 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 lsilon capabilities would show a better ROl for the customer?
A. lsilon has 6%-12% less filesystem overhead than traditional clustered filesystem solutions.
With a single filesystem and virtual capacity for drive and node failures, lsilon utilization is typically 80% or higher.
lsilon 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, lsilon 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 lsilon virtual capacity.
C. Forward Error Correction overhead is 7% lower than traditional RAlD.
lsilon has 6%-12% less filesystem overhead than traditional clustered filesystem solutions.
According to an lDC study, lsilon improves lT productivity by nearly 50% compared to traditional competitors.
D. lsilon has 15%-20% less overhead than traditional clustered filesystems.
According to an lDC study, lsilon utilization is nearly 50% higher than traditional competitors.
lsilon QOS headroom and multiple node pools ensures consistent performance up to 80% utilization.
Answer: A

Q: 9
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. 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
B. 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.
C. Dual 10GbE ports on each node will enable throughput of 20Gbps. Only connect half of the nodes to the network.
D. Maximum performance is obtained by only using a single 10GbE interface per node. lsilon can support up to 400MB/s per node
Answer: A

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


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