EMC E20-555 Online Practice Questions and Exam Preparation

EMC E20-555 Online Questions & Answers

• Question 51:

  You are designing a new Isilon system to store mobile device video clips. The files average 800MB in size and the application team tells you to plan for up to 15,000 new files per day. The product manager for this new service wants enough capacity for the first year and reminds you that response time for storing and retrieving the files is important for customer satisfaction.

  The files will be accessed frequently for the first 48 hours after creation, and then very infrequently after seven days. You plan to use N+2:1 protection, and will configure a SmartPools policy to move inactive files to an archive tier within the cluster.

  Which configuration best fits the project requirements?

  A. 4 x X200 nodes with SSD; 36 x NL400 nodes with 4TB drives
  B. 38 x X400 nodes with 4TB drives and SSD
  C. 4 x S200 nodes with SSD; 45 x NL400 nodes with 3TB drives
  D. 4 x X400 nodes with 1TB drives; 36 x NL400 nodes with 4TB drives
  A. 4 x X200 nodes with SSD; 36 x NL400 nodes with 4TB drives

• Question 52:

  What is the best case performance for Backup Accelerator when backing up to LTO-4 or LTO-5 drives?

  A. 864 GB/hr
  B. 1.7 TB/hr
  C. 2.6 TB/hr
  D. 3.4 TB/hr
  C. 2.6 TB/hr

• Question 53:

  A potential customer uses a solution from an EMC competitor for NFS storage in their main data center. The existing arrays are five years old, and the customer would like to consolidate them into a single new system. The entire workload is generated by eight Linux hosts connected to the arrays that process video files. The customer informs you they are not able to collect performance information from the existing arrays.

  Which tools can capture the workload requirements?

  A. iostat and nfsstat
  B. MiTrends and netmon
  C. netstat and esxtop
  D. Wireshark and sysstat
  A. iostat and nfsstat

• Question 54:

  You are sizing an Isilon cluster for a new customer. Analyzing their workflow you determine that they have a large block random read workload.

  What is the most important factor to consider when sizing this solution?

  A. Bandwidth
  B. IOPS
  C. Latency
  D. Headroom
  A. Bandwidth

• Question 55:

  In Isilon OneFS, what is the snapshot limit of a directory?

  A. 512
  B. 1024
  C. 2048
  D. No limit
  B. 1024

• Question 56:

  Which node type provides CPU, memory, and Fibre Channel connectivity?

  A. Backup Accelerator
  B. Performance Accelerator
  C. X-Series
  D. NL-Series
  A. Backup Accelerator

• Question 57:

  Which type(s) of data is predominately associated with home directories and file shares?

  A. E-mail files, PPT, Word documents
  B. Oracle directories
  C. SQL database files
  D. XML data
  A. E-mail files, PPT, Word documents

• Question 58:

  Which operational consideration is used in the Isilon Sizing Tool to determine the recommended data protection?

  A. MTTR
  B. MTTRC
  C. MTTDL
  D. MTBF
  C. MTTDL

• Question 59:

  A customer is running OneFS 8.0 on an Isilon cluster consisting exclusively of NL400 nodes. The storage administrator recently heard that OneFS 8.1 provides journal vaulting. What should you advise the storage administrator?

  A. Replace the batteries of the battery backed volatile storage with NiMH batteries.
  B. Add SSDs to all nodes of the existing cluster and upgrade to OneFS 8.1.
  C. Migrate all data from the current Isilon cluster to a Gen 6 cluster.
  D. Add a Gen 6 node to the existing Isilon cluster and upgrade to OneFS 8.1.
  D. Add a Gen 6 node to the existing Isilon cluster and upgrade to OneFS 8.1.

• Question 60:

  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.
  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.