EMC E10-001 Online Practice Questions and Exam Preparation

EMC E10-001 Online Questions & Answers

• Question 111:

  What defines the time taken to position the read/write head across the platter with a radial movement in a disk drive?

  A. Seek time
  B. Rotational latency
  C. Data transfer time
  D. Service time
  A. Seek time

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  Seek Time

  The seek time (also called access time) describes the time taken to position the R/W heads across the platter with a radial movement (moving along the radius of the platter). In other words, it is the time taken to position and settle the arm

  and the head over the correct track.

  Therefore, the lower the seek time, the faster the I/O operation. Disk vendors publish the following seek time specifications:

  Full Stroke: The time taken by the R/W head to move across the entire width of the disk, from the innermost track to the outermost track.

  Average: The average time taken by the R/W head to move from one random track to another, normally listed as the time for one-third of a full stroke. Track-to-Track: The time taken by the R/W head to move between adjacent tracks.

  Each of these specifications is measured in milliseconds. The seek time of a disk is typically specified by the drive manufacturer. The average seek time on a modern disk is typically in the range of 3 to 15 milliseconds. Seek time has more

  impact on the I/O operation of random tracks rather than the adjacent tracks. To minimize the seek time, data can be written to only a subset of the available cylinders. This results in lower usable capacity than the actual capacity of the drive.

  For example, a 500-GB disk drive is set up to use only the first 40 percent of the cylinders and is effectively treated as a 200-GB drive. This is known as short stroking the drive.

  EMC E10-001 Student Resource Guide. Module 2: Data Center Environment

• Question 112:

  What is the process that writes physical address information to a disk?

  A. Concatenating
  B. Formatting
  C. Partitioning
  D. Striping
  B. Formatting

• Question 113:

  Refer to the exhibit.

  

  Which type of host access to storage does `X' represent in the exhibit?

  A. File-level
  B. Block-level
  C. Object-level
  D. Sector-level
  A. File-level

• Question 114:

  What are the physical ports that interconnect two FC switches referred to as?

  A. E_Ports
  B. F_Ports
  C. G_Ports
  D. N_Ports
  A. E_Ports

• Question 115:

  Which NAS implementation creates a single file system that runs on all NAS nodes in a cluster?

  A. Unified and gateway
  B. Scale-out
  C. Gateway
  D. Unified
  B. Scale-out

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  Scale-Out NAS

  The scale-out NAS implementation pools multiple nodes together in a cluster. A node may consist of either the NAS head or storage or both. The cluster performs the NAS operation as a single entity.

  A scale-out NAS provides the capability to scale its resources by simply adding nodes to a clustered NAS architecture. The cluster works as a single NAS device and is managed centrally. Nodes can be added to the cluster, when more

  performance or more capacity is needed, without causing any downtime. Scale-out NAS provides the flexibility to use many nodes of moderate performance and availability characteristics to produce a total system that has better aggregate

  performance and availability. It also provides ease of use, low cost, and theoretically unlimited scalability.

  Scale-out NAS creates a single file system that runs on all nodes in the cluster. All information is shared among nodes, so the entire file system is accessible by clients connecting to any node in the cluster. Scale-out NAS stripes data across

  all nodes in a cluster along with mirror or parity protection. As data is sent from clients to the cluster, the data is divided and allocated to different nodes in parallel. When a client sends a request to read a file, the scale-out NAS retrieves the

  appropriate blocks from multiple nodes, recombines the blocks into a file, and presents the file to the client. As nodes are added, the file system grows dynamically and data is evenly distributed to every node. Each node added to the cluster

  increases the aggregate storage, memory, CPU, and network capacity. Hence, cluster performance also increases. EMC E10-001 Student Resource Guide. Module 7: Network-Attached Storage (NAS)

• Question 116:

  Which factors affect the performance of a disk drive?

  A. Seek time, rotational latency, and data transfer time
  B. Rotational latency, number of platters, and data transfer time
  C. Seek time, rotational latency, and number of read/write heads
  D. Data transfer time, number of cylinders, and rotational latency
  A. Seek time, rotational latency, and data transfer time

• Question 117:

  Which cloud computing capability enables monitoring and reporting resource usage?

  A. Metering
  B. Pooling
  C. Self-service requesting
  D. Publishing
  A. Metering

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  Measured Service Cloud systems automatically control and optimize resource use by leveraging a metering capability at some level of abstraction appropriate to the type of service (example, storage, processing, bandwidth, and active user accounts). Resource usage can be monitored, controlled, and reported, providing transparency for both the provider and consumer of the utilized service.

  EMC E10-001 Student Resource Guide Module 13: Cloud Computing

• Question 118:

  An application uses ten, 15 GB devices. A pointer-based full volume replica of the application is required. The replica will be kept for 24 hours and the data changes by 10% every 24 hours. How much storage should be allocated for the replication?

  A. 15 GB
  B. 30 GB
  C. 150 GB
  D. 300 GB
  C. 150 GB

• Question 119:

  Which RAID type is recommended for a high performance, write-intensive business critical application with small random writes?

  A. RAID1
  B. RAID 1+0
  C. RAID 5
  D. RAID 6
  B. RAID 1+0

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  Suitable RAID levels for Different Applications Common applications that benefit from different RAID levels.

  RAID 1+0 performs well for workloads that use small, random, write-intensive I/Os. Some applications that benefit from RAID 1+0 are high transaction rate online transaction processing (OLTP), RDBMS temp space and so on.

  RAID 3 provides good performance for applications that involve large sequential data access, such as data backup or video streaming.

  RAID 5 is good for random, read intensive I/O applications and preferred for messaging, medium-performance media serving, and relational database management system (RDBMS) implementations, in which database administrators (DBAs)

  optimize data access. EMC E10-001 Student Resource Guide. Module 3: Data Protection - RAID

• Question 120:

  Which component of a backup system is responsible for maintaining configuration information and backup metadata?

  A. Storage node
  B. Media server
  C. Backup server
  D. Backup client
  C. Backup server

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  Backup Architecture

  

  A backup system commonly uses the client-server architecture with a backup server and multiple backup clients. Figure on the slide illustrates the backup architecture. The backup server manages the backup operations and maintains the backup catalog, which contains information about the backup configuration and backup metadata. Backup configuration contains information about when to run backups, which client data to be backed up, and so on, and the backup metadata contains information about the backed up data. The role of a backup client is to gather the data that is to be backed up and send it to the storage node. It also sends the tracking information to the backup server.

  The storage node is responsible for writing the data, to the backup device. In a backup environment, a storage node is a host that controls backup devices. The storage node also sends tracking information to the backup server. In many cases, the storage node is integrated with the backup server, and both are hosted on the same physical platform. A backup device is attached directly or through a network to the storage node's host platform.

  Some backup architecture refers the storage node as the media server because it manages the storage device. EMC E10-001 Student Resource Guide. Module 9: Introduction to Business Continuity