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Exam Code: E20-555
Exam Name: EMC (Isilon Solutions and Design Specialist Exam for Technology Architects)
Free One year updates to match real exam scenarios, 100% pass and refund Warranty.
Total Q&A: 225 Questions and Answers
Last Update: 2013-11-22

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NO.1 What is the maximum volume or aggregate size that can be created with an Isilon Scale-Out
NAS system?
A. 16 TB
B. 100 TB
C. 2.3 PB
D. 20 PB
Answer: D

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NO.2 An Isilon customer expressed an interest in more effectively managing their storage.
Specifically, they would like to plan for future growth.
Which tool would allow the customer to forecast capacity requirements?
A. InsightIQ
B. Isilon SNMP MIB
C. SyncIQ
D. SmartPools
Answer: C

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NO.3 If Isilon SmartConnect is being configured in a customer environment, which records are
required for a supported implementation?
A. A SmartConnect Service IP host record and a zone delegation for the SmartConnect zone
delegated to the SSIP
B. An overloaded host record with each SmartConnect zone member's IP address and an SRV record
to provide resolution services
C. A SmartConnect Service IP host record and a corresponding PTR record for each SmartConnect
zone
D. A SOA record for the SmartConnect Service IP and a corresponding CNAME record for each
SmartConnect zone
Answer: A

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NO.4 At a minimum, how many connected and available nodes are required to maintain quorum in
a 25-node cluster?
A. 10
B. 12
C. 13
D. 17
Answer: C

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NO.5 A NetApp customer is considering Isilon. They use their filers for UNIX home directories, and
would like to see a suggested configuration that would meet their needs.
What would you do to help size this cluster?
A. Ask for an autosupport file and upload it to MiTrends to generate a workflow profile
B. Ask them to install InsightIQ and collect data from the filer, then import to SQL for analysis
C. Ask for the output from nfsstat and upload it to MiTrends to generate a workflow profile
D. Use tcpdump and upload the output file to MiTrends to generate a protocol analysis
Answer: C

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NO.6 A customer is making a decision between Isilon 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 ROI
and TCO to be important decision criteria.
Which statement best emphasizes the value of Isilon for this customer?
A. Isilon's OneFS data protection policies offer substantially lower overhead than competitive RAID
based NAS solutions.
B. An IDC study found that Isilon 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. Isilon's OneFS allows administrators to manage much larger amounts of capacity than
competitive offerings.
Answer: A

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NO.7 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
Answer: B

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NO.8 -- Exhibit -
A large manufacturing company is an existing Isilon customer with a cluster consisting of four NL400
nodes with 4TB drives. The cluster is using N+2:1 protection level and the file system shows that it is
60% utilized. Home directories and file shares comprise 75% of the existing content and the
remainder is inactive deep archive. The company has 1,000 employees using Windows and Mac
clients participating in a single Active Directory (AD) forest.
During a meeting with the CIO and Director of IT you discuss the company's recent acquisition - an
engineering firm that specializes in Computer Aided Design (CAD). The engineering firm has 400
UNIX workstations that produce technical drawings which are currently stored on another vendor's
SAN solution. The all UNIX environment uses NIS for authentication and name resolution. They do
not currently use DNS or LDAP . The engineering company has an old storage system that has been
experiencing problems and the CIO would like you to migrate the data onto the Isilon cluster. The
CIO would like to eliminate all tape and recover the data onto disk.
The CIO is concerned about security of the company's intellectual property, especially with the rapid
adoption of mobile devices and external cloud content sharing services such as DropBox, Egnyte,
and SugarSync. They would like to implement an alternative that provides external file sharing and
mobile device synchronization while maintaining security control over the company's data.
The Director of IT reports that users are storing non-work related content on the Isilon cluster. They
would like to limit the amount of capacity that each user can consume in their home directory and
want to ensure you provide the capability to easily visualize which users are over their
allotment.The company's Windows users currently leverage Windows Shadow Copy to recover files
that have been accidentally deleted. The IT department wants to ensure that Mac and incoming
UNIX clients have the same functionality.
The Director of IT also mentions that users are reporting slow response times when browsing their
home directories and shared folders. They are concerned that Isilon cannot scale to support their
combined requirements.
-- Exhibit -
Based on the meeting with the customer, which Isilon cluster configuration would you recommend?
A. 4 x X400 nodes with 2 x SSD and 34 x 4TB drives 1 x Additional NL400
B. 6 x X400 nodes with 36 x 4TB drives 1 x Backup Accelerator
C. 4 x NL400 nodes with 36 x 4TB drives
D. 9 x S200 nodes with 2 x SSD and 22 x 900GB SAS
Answer: A

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NO.9 An Isilon customer has an environment supporting a wide range of different workloads. They
want to assign clients to performance tiers based on the resources needed.
What can the customer use to meet this requirement?
A. SmartConnect Zones
B. Load Balancing
C. Client Connection Zone
D. SmartPools Advanced
Answer: A

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NO.10 What does Isilon OneFS use to re-write data when a disk read fails?
A. Dynamic Sector Repair
B. NVRAM
C. Isilon Data Integrity
D. CRC
Answer: A

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NO.11 -- 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 Hi-Seq 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 a third party data and metadata management service (IRODs) to stage data for analysis.
The Isilon cluster is mainly used for analysis work with the HPC cluster.
-- Exhibit -
The customer will add two more Illumina Hi-Seq Sequencers in the next 6 months.
Once these are added, what is the total amount of data from all the sequencers they can expect to
add per month?
A. 9.6 TB
B. 4.8 TB
C. 1.2 TB
D. 14.4 TB
Answer: A

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NO.12 Your customer uses an existing Isilon cluster consisting of five NL-Series nodes to source
broadcast media files for playback and streaming.The customer reports that the playback pauses
and stutters regularly. It has been confirmed that there are no network or playback system issues.
Which of the choices listed is the appropriate choice to address the playback issues?
A. Add three or more S-Series Nodes
B. Upgrade OneFS to the latest version
C. Enable SmartConnect Advanced
D. Enable Level 2 Caching
Answer: A

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NO.13 An Isilon customer created a scheduled SyncIQ policy to replicate data from an
Enterprise-mode SmartLock directory. The source cluster is now unusable and the target cluster
does not automatically allow writes to the data in the replicated SmartLock directory.
What is the reason why the target cluster did not automatically allow writes of the data?
A. SyncIQ Automated failover is not supported for SmartLock directories; however, manual failover
is allowed.
B. Automated failover and manual failover are not allowed on SmartLock directories on the target
cluster.
C. A SyncIQ job was running while the source cluster became unusable, thereby removing all data
on the target directory.
D. SnapshotIQ was not licensed on the target cluster; the snapshot of the directory is not available
for use by SyncIQ.
Answer: A

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NO.14 A customer created one month of snapshots; one snapshot every 8 hours for 30 days on an
Isilon cluster using SnapshotIQ. They are now deleting the snapshots randomly and experiencing
overhead to the cluster.
How can the snapshots be removed while avoiding the overhead caused by this process?
A. Delete the snapshots in order
B. Use SmartPools to move the snapshot data to a different tier
C. Snapshots cannot be deleted
D. Remove the directory
Answer: A

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NO.15 When an Isilon SyncIQ replication job completes, how many SnapshotIQ policies can be
created on a target cluster directory?
A. 1
B. 2
C. 3
D. 4
Answer: D

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