EMC E10-001 Online Practice Questions and Exam Preparation

EMC E10-001 Online Questions & Answers

• Question 21:

  What is an accurate statement about a backup-to-disk library solution?

  A. Supports storage of both backup and production data
  B. Provides built-in portability to meet offsite requirements
  C. Supports the shoe shining effect for improved backup performance
  D. Pre-configured and dedicated appliance is only used for back ups
  A. Supports storage of both backup and production data

• Question 22:

  What is a security implementation in NAS environments?

  A. Kerberos
  B. Port binding
  C. S_ID Lockdown
  D. FC-SP
  A. Kerberos

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  Security Implementation in NAS NAS is open to multiple exploits, including viruses, worms, unauthorized access, snooping, and data tampering. Various security mechanisms are implemented in NAS to secure data and the storage networking infrastructure. Permissions and ACLs form the first level of protection to NAS resources by restricting accessibility and sharing. These permissions are deployed over and above the default behaviors and attributes associated with files and folders. In addition, various other authentication and authorization mechanisms, such as Kerberos and directory services, are implemented to verify the identity of network users and define their privileges. Similarly, firewalls protect the storage infrastructure from unauthorized access and malicious attacks. EMC E10-001 Student Resource Guide. Module 14: Securing the Storage Infrastructure

• Question 23:

  An organization plans to deploy a new business application in their environment. The new application requires 4 TB of storage space. During peak workloads, the application is expected to generate 4900 IOPS with a typical I/O size of 8 KB. Because the application is business-critical, the response time must be within acceptable range.

  The available disk drive option is a 10,000 rpm drive with 200 GB capacity. The number of IOPS in which the disk drive can perform at 100 percent utilization is 140.

  What is the number of disk drives needed to meet the application's capacity and performance requirements?

  A. 20
  B. 25
  C. 35
  D. 50
  D. 50

• Question 24:

  What is considered a type of a passive attack on an IT infrastructure?

  A. Attempt to gain unauthorized access into the system
  B. Attempt to exhaust the network bandwidth to prevent legitimate access
  C. Attempt to modify the data in the storage system
  D. Attempt to impersonate an identity by providing false information
  A. Attempt to gain unauthorized access into the system

• Question 25:

  Which EMC product is a VNX array-based local replication software that creates a full volume mirror of the source?

  A. SnapView Snapshot
  B. SnapView Clone
  C. TimeFinder/Snap
  D. TimeFinder/Clone
  B. SnapView Clone

• Question 26:

  Which NAS backup environment transfers data to be backed up over a private backup network?

  A. NDMP three-way
  B. NDMP two-way
  C. Server-based
  D. Serverless
  A. NDMP three-way

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  NDMP 3-Way Backup

  

  In the NDMP 3-way method, to avoid the backup data traveling on the production LAN, a separate private backup network must be established between all NAS heads and the NAS head connected to the backup device. Metadata and NDMP control data are still transferred across the public network. Figure on the slide depicts NDMP 3-way backup. An NDMP 3-way is useful when backup devices need to be shared among NAS heads. It enables the NAS head to control the backup device and share it with other NAS heads by receiving the backup data through the NDMP.

  EMC E10-001 Student Resource Guide. Module 10: Backup and Archive

• Question 27:

  In a copy on first access (CoFA) technique, when is data copied from the source to the target?

  A. All writes are issued to a location on the source
  B. All writes are issued to a location on the target
  C. A read or write is issued for the first time to a location on the target
  D. A read is issued for the first time from a location on the source
  C. A read or write is issued for the first time to a location on the target

• Question 28:

  Which cache management algorithm is based on the assumption that data will not be requested by the host when it has not been accessed for a while?

  A. LRU
  B. HWM
  C. LWM
  D. MRU
  A. LRU

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  Cache Management: Algorithms

  Cache is a finite and expensive resource that needs proper management. Even though modern intelligent storage systems come with a large amount of cache, when all cache pages are filled, some pages have to be freed up to

  accommodate new data and avoid performance degradation. Various cache management algorithms are implemented in intelligent storage systems to proactively maintain a set of free pages and a list of pages that can be potentially freed up

  whenever required.

  The most commonly used algorithms are discussed in the following list:

  Least Recently Used (LRU): An algorithm that continuously monitors data access in cache and identifies the cache pages that have not been accessed for a long time. LRU either frees up these pages or marks them for reuse. This algorithm

  is based on the assumption that data that has not been accessed for a while will not be requested by the host.

  However, if a page contains write data that has not yet been committed to disk, the data is first written to disk before the page is reused.

  Most Recently Used (MRU): This algorithm is the opposite of LRU, where the pages that have been accessed most recently are freed up or marked for reuse. This algorithm is based on the assumption that recently accessed data may not be

  required for a while.

  EMC E10-001 Student Resource Guide. Module 4: Intelligent Storage System

• Question 29:

  What is an advantage of sub-LUN tiering?

  A. Improved performance
  B. Enhanced reliability and availability
  C. Dynamic expansion of storage capacity
  D. Faster provisioning of thin LUNs
  A. Improved performance

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  Intra-array Storage Tiering

  

  The process of storage tiering within a storage array is called intra-array storage tiering. It enables the efficient use of SSD, FC, and SATA drives within an array and provides performance and cost optimization. The goal is to keep the SSDs busy by storing the most frequently accessed data on them, while moving out the less frequently accessed data to the SATA drives. Data movements executed between tiers can be performed at the LUN level or at the sub-LUN level. The performance can be further improved by implementing tiered cache.

  Traditionally, storage tiering is operated at the LUN level that moves an entire LUN from one tier of storage to another. This movement includes both active and inactive data in that LUN.

  This method does not give effective cost and performance benefits. Today, storage tiering can be implemented at the sub-LUN level. In sub-LUN level tiering, a LUN is broken down into smaller segments and tiered at that level. Movement of data with much finer granularity, for example 8 MB, greatly enhances the value proposition of automated storage tiering. Tiering at the sub-LUN level effectively moves active data to faster drives and less active data to slower drives.

  EMC E10-001 Student Resource Guide. Module 15: Managing the Storage Infrastructure

• Question 30:

  What is a benefit of block-level storage virtualization?

  A. Enables users to perform nondisruptive data migrations
  B. Enables users to automatically perform zoning changes
  C. Reduces application downtime during backups
  D. Enables hosts to perform online path management
  A. Enables users to perform nondisruptive data migrations

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  Block Level Storage Virtualization Block-level storage virtualization aggregates block storage devices (LUNs) and enables provisioning of virtual storage volumes, independent of the underlying physical storage. A virtualization layer, which exists at the SAN, abstracts the identity of physical storage devices and creates a storage pool from heterogeneous storage devices. Virtual volumes are created from the storage pool and assigned to the hosts. Instead of being directed to the LUNs on the individual storage arrays, the hosts are directed to the virtual volumes provided by the virtualization layer. For hosts and storage arrays, the virtualization layer appears as the target and initiator devices, respectively. The virtualization layer maps the virtual volumes to the LUNs on the individual arrays. The hosts remain unaware of the mapping operation and access the virtual volumes as if they were accessing the physical storage attached to them.

  

  Typically, the virtualization layer is managed via a dedicated virtualization appliance to which the hosts and the storage arrays are connected.

  Figure in the slide illustrates a virtualized environment. It shows two physical servers, each of which has one virtual volume assigned. These virtual volumes are used by the servers. These virtual volumes are mapped to the LUNs in the storage arrays. When an I/O is sent to a virtual volume, it is redirected through the virtualization layer at the storage network to the mapped LUNs. Depending on the capabilities of the virtualization appliance, the architecture may allow for more complex mapping between array LUNs and virtual volumes.

  Block-level storage virtualization enables extending the storage volumes online to meet application growth requirements. It consolidates heterogeneous storage arrays and enables transparent volume access. Block-level storage virtualization also provides the advantage of nondisruptive data migration. In a traditional SAN environment, LUN migration from one array to another is an offline event because the hosts needed to be updated to reflect the new array configuration.

  In other instances, host CPU cycles were required to migrate data from one array to the other, especially in a multivendor environment. With a block-level virtualization solution in place, the virtualization layer handles the back-end migration of data, which enables LUNs to remain online and accessible while data is migrating. No physical changes are required because the host still points to the same virtual targets on the virtualization layer. However, the mappings information on the virtualization layer should be changed. These changes can be executed dynamically and are transparent to the end user. EMC E10-001 Student Resource Guide. Module 5: Fibre Channel Storage Area Network (FC SAN)