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EMC E20-555 Practice Test 1-13
QUESTION 1
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 NICs to 10 GigE on each node.
D. Add five A100 (24 GB RAM) accelerator nodes.
Correct Answer: A
QUESTION 2
A four-node Isilon cluster is being used in a Hadoop workflow with a parity protection of N+2:1. The HDFS protocol has
been enabled and is being used to access data.
How many additional copies of data are written into the Isilon cluster using HDFS?
A. None
B. One
C. Three
D. Two
Correct Answer: A
QUESTION 3
When using an N+2:1 protection policy on a 7-node Isilon cluster, how much capacity will be used to store a 510 KiB
file?
A. 638 KiB
B. 640 KiB
C. 766 KiB
D. 768 KiB
Correct Answer: A
QUESTION 4
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 Isilon capabilities can address the customer\\’s concerns?
A. Isilon does not perform rebuilds – data reprotection is typically 2x-3x faster than traditional RAID rebuilds. N+3 and
N+4 Protection Levels exceed traditional RAID6 availability. Data redistribution runs faster with more nodes in the
cluster.
B. N+3 and N+4 Protection Levels exceed traditional RAID6 availability. Proactive hot sparing eliminates most drive
rebuilds. Endurant Cache reduces the overhead for write operations.
C. Isilon does not perform rebuilds – data reprotection is typically 2x-3x faster than traditional RAID rebuilds. Data
recovery is consistent, taking the same amount of time regardless of cluster size. Isilon \\’short strokes\\’ 4TB drives to
reduce rebuild time.
D. Isilon 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 RAID6 availability.
Correct Answer: A
QUESTION 5
The protection level of an Isilon Gen 6 cluster with eight nodes has been set to the default protection level. How many
failures are tolerated without data loss?
A. Two drives or one node
B. Two drives and one node
C. Two drives in every node
D. Three drives or three nodes
Correct Answer: A
QUESTION 6
Your customer manages a print media environment, consisting of three Isilon clusters, which are out of support. The
customer would like to have access to new software releases and feature sets. You have been asked to perform a full
discovery of the customer\\’s environment.
The customer\\’s current Isilon clusters are as follows:
“Cust” (12 x 12000X) serves as upload media storage for different tenants.
“Working” (8 x 12000X + 6 x X200) serves as a working zone for extraction to RAW and printing media from it.
“Archive” (16 x 72NL + Accelerator nodes) is used to store printed content for six months.
The customer operates in a Windows environment using SMB 2.0, two DNS servers per AD forest, three forest domains
that are servicing three different environments. All servers are operating on a 1Gb network, three VLANs segregating
the DEV/QA/PROD environments. Currently, there is no monitoring in place for performance measurement or
optimization.
The requirements for this solution include:
Better ROI and TCO
Maintain same performance with possible improvements
Renew HW/SW and get inclusive support
Limit migrations
Reduce space, power, cooling consumption
Get new feature sets
If migration required, use Parallel copy (multiple nodes, multiple threads, multiple connections)
Segregate tenant shares from other tenants
Expand up to 1PB of total storage
Which licenses need to be defined for the solution to perform optimally?
A. HDFS, SmartQuotas, SnapshotIQ, InsightIQ
B. SmartPools, SnapshotIQ, SyncIQ, SmartLock
C. InsightIQ, SmartPools, SyncIQ, SmartConnect Advanced
D. SyncIQ, InsightIQ, SmartPools, Platform API
Correct Answer: B
QUESTION 7
— Exhibit -We have been engaged by a research hospital to help upgrade their Isilon installation. They currently have 12
previous generation Isilon nodes with 200TB of capacity and run on a 1Gbps network. They currently have 6 Illumina HiSeq Sequencers and an HPC cluster to process data. They would like to expand Isilon to 2PB of active data and 1PB of
archive data. They use third-party data and metadata management services (IRODs) to stage data for analysis. The
Isilon cluster is mainly used for analysis work with the HPC cluster. — Exhibit –
Before making any changes, the customer would like a graphical presentation of their existing array performance to
present to management.
What is the best tool to gather this information?
A. InsightIQ
B. isi_netlogger
C. tcpdump
D. netstat
Correct Answer: A
QUESTION 8
A customer is evaluating Isilon and Pure FlashBlade solutions. Which protocol is available for both solutions?
A. NFSv3
B. SMBv3
C. FTP
D. HDFS
Correct Answer: C
QUESTION 9
You are asked to size a cluster for a file-sharing environment. nfsstat indicates that 75% of the requests are namespace
operations (e.g., GETADDR, SETADDR). There will be 8,000 active Linux users, connecting over NFS. Which cluster
configuration would you recommend?
A. Five X400 (66 TB) 48 GB RAM, 1.2 TB SSD, N+2:1
B. Eight X200 (27 TB) 12 GB RAM, 600 GB SSD, N+2
C. Eight X200 (27 TB) 48 GB RAM, 600 GB SSD, N+2:1
D. Eight X200 (36 TB) 48 GB RAM, no SSD, N+2:1
Correct Answer: C
QUESTION 10
What is a characteristic of predefined sets of privileges of OneFS built-in administrator roles?
A. Can be modified without limitation
B. Can be nested into other roles
C. Cannot be modified
D. Can be modified by selected users
Correct Answer: C
Explanation: OneFS includes built-in administrator roles with predefined sets of privileges that cannot be modified.
Reference: click here
QUESTION 10
What is a characteristic of predefined sets of privileges of OneFS built-in administrator roles?
A. Can be modified without limitation
B. Can be nested into other roles
C. Cannot be modified
D. Can be modified by selected users
Correct Answer: C
Explanation: OneFS includes built-in administrator roles with predefined sets of privileges that cannot be modified.
Reference: click here
QUESTION 11
A telecommunications company has a substantial amount of data. This data is being created by network elements within
their environment.
The company wants to change the way the network elements Call Detail Records (CDR) are stored and analyzed. The
existing infrastructure consolidates all of the CDRs into a table structure and then ingests them into a large database.
Once ingested, a query engine accesses the database and performs analysis on these files. The system is functional;
however, since the amount of CDRs generated will increase exponentially over the next year, the company is open to
alternatives for storing and analyzing these records.
In evaluating alternatives, the key requirements are to reduce cost, the amount of storage, and the amount of time to
analyze the data. The customer would like to use Hadoop to analyze the CDRs.
After you have conducted an assessment of the workflow, you have recommended an Isilon Cluster to work within the
Hadoop environment.
Which protocols would be the best fit when using Isilon for this customer\\’s Hadoop workflow?
A. NDMP and SCP
B. NFS and HDFS
C. CIFS and FTP
D. SyncIQ and HTTP
Correct Answer: B
QUESTION 12
A customer environment is used for analytics on very large datasets. They are interested in using Isilon storage and
Hadoop but are concerned about the costs. How does Isilon change the scalability of a Hadoop environment?
A. JobTracker and TaskTracker are offloaded to the Isilon cluster
B. DataNode and TaskTracker are offloaded to the Isilon cluster
C. NameNode and DataNode are offloaded to the Isilon cluster
D. NameNode and JobTracker are offloaded to the Isilon cluster
Correct Answer: C
QUESTION 13
Refer to the exhibit.
Which tool was used to create this output and which line item counts the metadata read operations occurring in the file
service?
A. nfsstat and getattr
B. iostat and fsstat
C. tcpdump and nfsstat
D. isi_netlogger and commit
Correct Answer: A
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