EMC E10-001 Online Practice Questions and Exam Preparation

EMC E10-001 Online Questions & Answers

• Question 161:

  When is data copied from the source to the save location in pointer based replica technology?

  A. All writes to a location on the source
  B. All writes to a location on the target
  C. First read from a location on the target
  D. First write to a location on the source
  D. First write to a location on the source

• Question 162:

  Which process defines the writing of physical address information to a disk?

  A. Partitioning
  B. Formatting
  C. Zoned-bit recording
  D. Command queuing
  B. Formatting

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  Disk Structure

  

  Data on the disk is recorded on tracks, which are concentric rings on the platter around the spindle. The tracks are numbered, starting from zero, from the outer edge of the platter. The number of tracks per inch (TPI) on the platter (or the track density) measures how tightly the tracks are packed on a platter.

  Each track is divided into smaller units called sectors. A sector is the smallest, individually addressable unit of storage. The track and sector structure is written on the platter by the drive manufacturer using a low- level formatting operation. The number of sectors per track varies according to the drive type. The first personal computer disks had 17 sectors per track.

  Recent disks have a much larger number of sectors on a single track. There can be thousands of tracks on a platter, depending on the physical dimensions and recording density of the platter.

  Typically, a sector holds 512 bytes of user data; although, some disks can be formatted with larger sector sizes. In addition to user data, a sector also stores other information, such as the sector number, head number or platter number, and track number. This information helps the controller to locate the data on the drive.

  A cylinder is a set of identical tracks on both surfaces of each drive platter. The location of R/W heads is referred to by the cylinder number, not by the track number. EMC E10-001 Student Resource Guide. Module 2: Data Center Environment

• Question 163:

  When using the image-based backup approach to backup a virtual machine, where does the backup client run?

  A. Proxy server
  B. Hypervisor
  C. Virtual machine
  D. Backup device
  A. Proxy server

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  Image-based Backup Image-based backup operates at the hypervisor level and essentially takes a snapshot of the VM. It creates a copy of the guest OS and all the data associated with it (snapshot of VM disk files), including the VM state and application configurations. The backup is saved as a single file called an "image" and this image is mounted on the proxy server (acts as a backup client). The backup software then backs up these image files normally. This effectively offloads the backup processing from the hypervisor and transfers the load on the proxy server, thereby reducing the impact to VMs running on the hypervisor. Image-based backup enables quick restoration of a VM. EMC E10-001 Student Resource Guide. Module 10: Backup and Archive

  

• Question 164:

  Which layer of the Fibre Channel (FC) protocol stack defines the fabric services?

  A. FC-0
  B. FC-1
  C. FC-2
  D. FC-4
  C. FC-2

• Question 165:

  What is the purpose of monitoring capacity in a storage infrastructure?

  A. Ensuring availability of adequate resources to prevent service unavailability
  B. Evaluating utilization of components and identifying bottlenecks
  C. Tracking configuration changes of infrastructure elements
  D. Identifying component failures that may lead to service unavailability
  A. Ensuring availability of adequate resources to prevent service unavailability

• Question 166:

  An organization wants to interconnect their distributed FC SANs for disaster recovery implementations.

  Which protocol is recommended to connect the FC SANs?

  A. iSCSI
  B. FCoE
  C. FCIP
  D. infiniBand
  C. FCIP

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  IP SAN Protocol: FCIP FC SAN provides a high-performance infrastructure for localized data movement. Organizations are now looking for ways to transport data over a long distance between their disparate SANs at multiple geographic locations. One of the best ways to achieve this goal is to interconnect geographically dispersed SANs through reliable, high-speed links. This approach involves transporting the FC block data over the IP infrastructure. FCIP is a tunneling protocol that enables distributed FC SAN islands to be interconnected over the existing IP-based networks.

  FCIP is a protocol in which FCIP entity such as FCIP gateway is used to tunnel FC fabrics through an IP network. In FCIP FC frames are encapsulated onto the IP payload. An FCIP implementation is capable to merge interconnected fabrics into a single fabric. Frequently, only a small subset of nodes at either end requires connectivity across fabrics. Thus, the majority of FCIP implementations today use switch-specific features such as IVR (Inter-VSAN Routing) or FCRS (Fibre Channel Routing Services) to create a tunnel. In this manner, traffic may be routed between specific nodes without actually merging the fabrics.

  The FCIP standard has rapidly gained acceptance as a manageable, cost-effective way to blend the best of the two worlds: FC SAN and the proven, widely deployed IP infrastructure.

  As a result, organizations now have a better way to store, protect, and move their data by leveraging investments in their existing IP infrastructure. FCIP is extensively used in disaster recovery implementations in which data is duplicated to the storage located at a remote site. EMC E10-001 Student Resource Guide. Module 6: IP SAN and FCoE

• Question 167:

  What is a key benefit of RAID 5 compared to RAID 1+0 for small, random I/Os?

  A. Improved storage space utilization
  B. Improved write performance
  C. Higher availability
  D. Faster rebuild times after failure
  A. Improved storage space utilization

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  RAID Comparison

  

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

• Question 168:

  Which EMC product enables VNX array-based remote replication from a primary volume to a secondary volume residing on a different VNX storage system?

  A. MirrorView
  B. SnapView
  C. RepliStor
  D. SRDF
  A. MirrorView

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  EMC MirrorView The MirrorView software enables EMC VNX storage arraybased remote replication. It replicates the contents of a primary volume to a secondary volume that resides on a different VNX storage system. The MirrorView family consists of MirrorView/Synchronous (MirrorView/S) and MirrorView/Asynchronous (MirrorView/A) solutions.

  MirrorView/S is a synchronous product that mirrors data between local and remote storage systems. MirrorView/A is an asynchronous product that offers extended distance replication based on periodic incremental update model. It periodically updates the remote copy of the data with all the changes that occurred on the primary copy since the last update.

  EMC E10-001 Student Resource Guide. Module 12: Remote Replication

• Question 169:

  What describes application virtualization?

  A. Breaks the dependency between the application and the underlying platform
  B. Increases the application and CPU utilization
  C. Provides interoperability between different application versions
  D. Breaks the dependency between the application interface and the processing logic
  A. Breaks the dependency between the application and the underlying platform

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  Application Virtualization Application virtualization breaks the dependency between the application and the underlying platform (OS and hardware). Application virtualization encapsulates the application and the required OS resources within a virtualized container. This technology provides the ability to deploy applications without making any change to the underlying OS, file system, or registry of the computing platform on which they are deployed. Because virtualized applications run in an isolated environment, the underlying OS and other applications are protected from potential corruptions. There are many scenarios in which conflicts might arise if multiple applications or multiple versions of the same application are installed on the same computing platform. Application virtualization eliminates this conflict by isolating different versions of an application and the associated O/S resources. EMC E10-001 Student Resource Guide. Module 2: Data Center Environment

• Question 170:

  A customer has a requirement to perform a backup each night. However, the customer has a limited amount of time for backups to run on week nights, Monday through Friday evenings. Which backup granularity type is recommended to meet the backup window for those nights?

  A. Incremental
  B. Cumulative
  C. Full
  D. Differential
  A. Incremental

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  Backup Granularity

  

  Backup granularity depends on business needs and the required RTO/RPO. Based on the granularity, backups can be categorized as full, incremental, and cumulative (or differential).

  Most organizations use a combination of these three backup types to meet their backup and recovery requirements. Figure on the slide depicts the different backup granularity levels.

  Full backup is a backup of the complete data on the production volumes. A full backup copy is created by copying the data in the production volumes to a backup storage device. It provides a faster recovery but requires more storage space and also takes more time to back up. Incremental backup copies the data that has changed since the last full or incremental backup, whichever has occurred more recently. This is much faster than a full backup (because the volume of data backed up is restricted to the changed data only) but takes longer to restore . Cumulative backup copies the data that has changed since the last full backup. This method takes longer than an incremental backup but is faster to restore.

  Another way to implement full backup is synthetic (or constructed) backup. This method is used when the production volume resources cannot be exclusively reserved for a backup process for extended periods to perform a full backup. It is usually created from the most recent full backup and all the incremental backups performed after that full backup. This backup is called synthetic because the backup is not created directly from production data.

  A synthetic full backup enables a full backup copy to be created offline without disrupting the I/O operation on the production volume. This also frees up network resources from the backup process, making them available for other production uses. EMC E10-001 Student Resource Guide. Module 10: Backup and Archive