E20-555 Cluster Practice Questions
The free E20-555: Isilon Solutions and Design Specialist for Technology Architects questions that deal with cluster, with answers and explanations. The full bank and the timed practice test cover every topic the exam asks about.
Question #2
An Isilon cluster component has the following characteristics: Spans 3 - 40 nodes Logical grouping of drives Automatically assigned Intelligently distributes disks to manage performance Which cluster component is described?
Correct answer: A
Explanation
Disk pools are automatically created subsets of drives within a node pool; OneFS assigns drives to them intelligently so protection stripes are spread across the pool, and they can span 3 to 40 nodes.
Question #5
A customer plans to consolidate 200 TB of digital images and video content. Performance is important for recently created files. However, the customer wants any content that has not been accessed within 30 days to be stored in the cluster at a much lower cost because performance is no longer critical. Which Isilon configuration should be recommended?
Correct answer: A
Explanation
X-Series nodes serve the performance tier for new files, NL-Series nodes provide low-cost archive capacity, and SmartPools automatically moves files not accessed for 30 days to the NL tier.
Question #7
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 five node Isilon cluster. They have enabled the Hadoop cluster to access the files directly. The nodes are X400's with two SSD drives in each node and 96GB of RAM. How many DataNodes does the Isilon Cluster have?
Correct answer: B
Explanation
With OneFS HDFS support every Isilon node acts as both a NameNode and a DataNode, so a five-node cluster presents five DataNodes to the Hadoop cluster.
Question #8
If a file is 4 KB in size, how much space is consumed for file data when it is written to the Isilon cluster?
Correct answer: B
Explanation
Files smaller than 128 KB are mirrored rather than FEC-striped, so a 4 KB file at default N+1 protection is stored as two 4 KB copies, consuming 8 KB.
Question #9
While validating the value (VTV) with a large educational customer, they have decided they would like to add a Disaster Recovery (DR) site to their existing Isilon environment. The existing cluster contains six X-Series nodes. They plan to have all workflows replicated to the DR site and both clusters will have identical shares, exports, and user authentication. The customer would like to test DR failover every six months by running their production environment from the DR site. What would you recommend for the DR solution?
Correct answer: A
Explanation
Running full production from the DR site every six months requires equivalent performance and capacity, so SyncIQ replication to an identical cluster is the correct design; NL-Series archive nodes would not sustain production workloads.
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