EMC E10-001 Online Practice Questions and Exam Preparation

EMC E10-001 Online Questions & Answers

• Question 1:

  What is a role of the metadata service in object-based storage?

  A. Stores both objects and object IDs
  B. Maps object IDs to the file system namespace
  C. Manages a set of disks on which the user data is stored
  D. Stores data in the form of objects
  B. Maps object IDs to the file system namespace

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  Key components of Object-based Storage Device

  

  The OSD system is typically composed of three key components: nodes, private network, and storage.

  The OSD system is composed of one or more nodes. A node is a server that runs the OSD operating environment and provides services to store, retrieve, and manage data in the system. The OSD node has two key services: metadata service and storage service. The metadata service is responsible for generating the object ID from the contents (may also include other attributes of data) of a file. It also maintains the mapping of the object IDs and the file system namespace. The storage service manages a set of disks on which the user data is stored. The OSD nodes connect to the storage via an internal network. The internal network provides node-to-node connectivity and node-to-storage connectivity. The application server accesses the node to store and retrieve data over an external network. In some implementations, such as CAS, the metadata service might reside on the application server or on a separate server.

  OSD typically uses low-cost and high-density disk drives to store the objects. As more capacity is required, more disk drives can be added to the system EMC E10-001 Student Resource Guide. Module 8: Object- based and Unified Storage

• Question 2:

  What is a requirement for a native iSCSI implementation?

  A. Host with an iSCSI HBA and an array with an iSCSI port
  B. Host with a NIC and an array with an FCoE port
  C. Host with iSCSI initiator software and an array with an FCIP port
  D. Host with an iSCSI HBA and an array with an FC port
  A. Host with an iSCSI HBA and an array with an iSCSI port

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  iSCSI Topologies: Native iSCSI

  

  Two topologies of iSCSI implementations are native and bridged. Native topology does not have FC components. The initiators may be either directly attached to targets or connected through the IP network. FC components are not required for iSCSI connectivity if an iSCSI-enabled array is deployed. In figure in the slide, the array has one or more iSCSI ports configured with an IP address and connected to a standard Ethernet switch. After an initiator is logged on to the network, it can access the available LUNs on the storage array. A single array port can service multiple hosts or initiators as long as the array port can handle the amount of storage traffic that the hosts generate. EMC E10-001 Student Resource Guide. Module 6: IP SAN and FCoE

• Question 3:

  What is a characteristic of iSNS?

  A. Assigns iSCSI names to the available targets
  B. Authenticates iSCSI gateways automatically
  C. Requires manual configuration and registration of initiators
  D. Provides a list of available targets to the initiator
  D. Provides a list of available targets to the initiator

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  iSCSI Discovery

  An initiator must discover the location of its targets on the network and the names of the targets available to it before it can establish a session. This discovery can take place in two ways:

  SendTargets discovery or internet Storage Name Service (iSNS).

  In SendTargets discovery, the initiator is manually configured with the target's network portal to establish a discovery session. The initiator issues the SendTargets command, and the target network portal responds with the required

  parameters of the targets available to the host.

  iSNS enables automatic discovery of iSCSI devices on an IP network. The initiators and targets can be configured to automatically register themselves with the iSNS server. Whenever an initiator wants to know the targets that it can access, it

  can query the iSNS server for a list of available targets. EMC E10-001 Student Resource Guide. Module 6: IP SAN and FCoE

• Question 4:

  In an object-based storage environment, which entities does an object contain?

  A. Data, metadata, object ID, and attributes
  B. LUN ID, data, metadata, and attributes
  C. Metadata, object ID, attributes, and file path
  D. Object ID, attributes, LUN ID, and file path
  A. Data, metadata, object ID, and attributes

• Question 5:

  What is a characteristic of pointer-based virtual replication?

  A. Replica is immediately available after activation of a replication session
  B. Replica device is at least as large as the source device
  C. Replica is available only after detachment from the source
  D. Source does not need to be healthy for the restore
  A. Replica is immediately available after activation of a replication session

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  Pointer-based Virtual Replication In pointer-based virtual replication, at the time of the replication session activation, the target contains pointers to the location of the data on the source. The target does not contain data at any time. Therefore, the target is known as a virtual replica. Similar to pointer-based full-volume replication, the target is immediately accessible after the replication session activation. This replication method uses CoFW technology and typically recommended when the changes to the source are less than 30%.

  EMC E10-001 Student Resource Guide. Module 11: Local Replication

• Question 6:

  What is a characteristic of a scale-out NAS?

  A. File system grows dynamically as nodes are added in the cluster
  B. Up to four file systems can be created across the cluster
  C. Distinct file systems are created on each node in the cluster
  D. Different file systems can be mixed on each node in a single cluster
  A. File system grows dynamically as nodes are added in the cluster

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  NAS Implementation - 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 7:

  Which EMC product provides target-based deduplication?

  A. Data Domain
  B. Avamar
  C. NetWorker
  D. RecoverPoint
  A. Data Domain

• Question 8:

  How do VSANs work?

  A. Restricts communication between nodes located within the same VSAN and zone
  B. Each VSAN acts as an independent fabric with its own set of fabric services
  C. Enables assigning the same WWN and MAC addresses to nodes in different VSANs
  D. Fabric-related configurations are uniformly applied to all VSANs
  B. Each VSAN acts as an independent fabric with its own set of fabric services

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  Virtual SAN (VSAN)

  Virtual SAN (also called virtual fabric) is a logical fabric on an FC SAN, which enables communication among a group of nodes regardless of their physical location in the fabric. In a VSAN, a group of hosts or storage ports communicate with

  each other using a virtual topology defined on the physical SAN. Multiple VSANs may be created on a single physical SAN. Each VSAN acts as an independent fabric with its own set of fabric services, such as name server, and zoning.

  Fabric-related configurations in one VSAN do not affect the traffic in another.

  VSANs improve SAN security, scalability, availability, and manageability. VSANs provide enhanced security by isolating the sensitive data in a VSAN and by restricting access to the resources located within that VSAN.

  EMC E10-001 Student Resource Guide. Module 5: Fibre Channel Storage Area Network (FC SAN)

• Question 9:

  In an FC SAN environment, what is a benefit of zoning?

  A. Restricts RSCN traffic
  B. Isolates fabric services
  C. Enables online volume expansion
  D. Provides non-disruptive data migration
  A. Restricts RSCN traffic

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  Zoning

  Zoning is an FC switch function that enables node ports within the fabric to be logically segmented into groups and communicate with each other within the group.

  Whenever a change takes place in the name server database, the fabric controller sends a Registered State Change Notification (RSCN) to all the nodes impacted by the change. If zoning is not configured, the fabric controller sends an

  RSCN to all the nodes in the fabric. Involving the nodes that are not impacted by the change results in increased fabric-management traffic. For a large fabric, the amount of FC traffic generated due to this process can be significant and might

  impact the host-to-storage data traffic. Zoning helps to limit the number of RSCNs in a fabric. In the presence of zoning, a fabric sends the RSCN to only those nodes in a zone where the change has occurred.

  EMC E10-001 Student Resource Guide. Module 5: Fibre Channel Storage Area Network (FC SAN)

• Question 10:

  In a virtualized environment, which method enables a virtual machine to be rolled back in case of a logical corruption to the virtual machine?

  A. Virtual volume replication
  B. VM snapshot
  C. Storage array volume replication
  D. VM clone
  B. VM snapshot