E20-555 Online Practice Questions and Answers

A customer needs to consolidate 300 TB of home directory servers and shared file systems used by development and test groups. A key requirement is to prevent the systems from consuming all free capacity and impacting home directory content.

Which Isilon node configuration should be proposed?

A. X-Series with SmartQuotas

B. NL-Series with SmartQuotas

C. S-Series with InsightIQ

D. X-Series with SmartPools

A customer wants an N+3 protection level on their cluster. What is the minimum number of nodes they need to achieve that level of protection?

A. 3

B. 6

C. 7

D. 8

Your customer has a new business unit. They are gathering web log files to be analyzed. They are using Hadoop to do the analysis of the logs. The IT department is centrally storing the log files on a 5-node Isilon cluster. They have enabled the Hadoop cluster to access the files directly on the Isilon storage. The nodes are X400's with two SSD drives in each node and 96GB of RAM.

How many DataNodes does the Isilon cluster have?

A. Five

B. One

C. Three

D. Two

For concurrent I/O, how do SmartCache and Endurant Cache differ?

A. Endurant Cache sends an acknowledgement to the client immediately after mirroring writes in NVRAM

B. Endurant Cache waits for acknowledgement from all nodes before copying to L2 cache

C. SmartCache immediately commits the write to NVRAM on the local node and one peer node

D. SmartCache uses sub-file, granular locking whereas Endurant Cache locks the entire file

What is the relative latency of a cache hit to L1 cache compared to a hit to L2 cache in an Isilon cluster?

A. 2x

B. 5x

C. 10x

D. 25x

You meet a customer for the first time. They explain that their current environment for NAS does not meet their needs. You want to make sure that Isilon is a good fit for their needs.

What would be a good prequalifying question to ask?

A. What Applications access this storage?

B. What type of racks are in your datacenter?

C. Are you using a KVM to access your storage?

D. How many NICs do your clients have?

Refer to the exhibit.

Which tool was used to create this output and what is the most telling characteristic?

A. nfsstat and write-intensive access

B. iostat and write-intensive access

C. Read-intensive access and nfsstat

D. isi_netlogger and moderate metadata read operations

A Media and Entertainment company is considering changing from 2K resolution to 4K resolution. They will continue to use the DNxHD 220 codec.

Assuming everything else stays the same, how will this change affect storage?

A. Storage will be half as large

B. Storage requirements will not change

C. Storage will be twice as large

D. Storage will be four times as large

A customer is having problems writing data to their Isilon cluster. You have checked all network settings and authentication sources. No errors are reported from the cluster. The customer runs tcpdump and sends the results to you.

Now that you have the output, which tool would you use to open the results file?

A. IOZone

B. Wireshark

C. MiTrend

D. Iometer

A customer configures a file pool policy to write data to tier 2 on the Isilon cluster. This is in addition to the 30 policies already created. Later in the week they check the file placement and see that it has not been written to the correct tire. What could be the problem?

A. Number of allowable policies has been exceeded so the new policy will not run.

B. File matches a policy for a different tier that is listed higher in the file pool policy list.

C. SmartPools policy job has not yet run so the file was written using the default policy.

D. File matches a policy for a different tier that is listed lower in the file pool policy list