EMC E20-880 Online Practice Questions and Exam Preparation

EMC E20-880 Online Questions & Answers

• Question 1:

  A customer has a mix of Windows 2003 and Windows 2008 virtualized guests deployed in their vSphere v4 environment. They have purchased a new VNX array and are also upgrading their ESX servers from V4.0 to V5.0.

  Their VMware administrators are creating the new target LUNs and VMFS file systems for their datastores. They have noticed that the alignment offset on the new array is not the same as their old array, so they are concerned about disk

  crossing on the new array.

  How would you respond to the customer?

  A. The offset for VMFS-5 is now 1 MiB and will not affect performance of any of the VMs.
  B. The offset for VMFS-5 is still 64 KiB and will not affect performance of any of the VMs.
  C. All VMs will need to be manually adjusted.
  D. Windows 2003 VMs will need to be manually adjusted; Windows 2008 VMs will not be affected.
  A. The offset for VMFS-5 is now 1 MiB and will not affect performance of any of the VMs.

• Question 2:

  In reviewing a nar analysis, what does workload skew measure?

  A. How much of the storage is handling the bulk of the workload
  B. The percentage of data that would be demoted from FAST Cache
  C. The distribution of the active data on the backend disks
  D. The percentage of data that has been moved to the Extreme Performance Tier
  A. How much of the storage is handling the bulk of the workload

• Question 3:

  Exchange 2010 is being implemented on a pair of VNX storage arrays. There will be a production site and a DR site, each with two servers and one VNX storage array. EMC RecoverPoint will handle the remote replication between the sites. Which is a valid architecture?

  A. Implement both Exchange servers in a local DAG. Install EMC Replication Enabler for Exchange (REE) and install Replication Manager agents on all severs in the DAG.
  B. Implement both Exchange servers in a cluster with shared disks. Use separate LUNs and RAID Groups for the Database, Log and Quorum. Install and enable EMC Replication Manager for remote replication.
  C. Implement both Exchange servers in a local DAG. Install EMC Replication Manager for remote replication.
  D. Implement both Exchange servers in a cluster with shared disks. Use separate LUNs and RAID Groups for the Database, Log and Quorum. Install and enable Microsoft Cluster Enabler for RecoverPoint to enable cluster failover between sites.
  A. Implement both Exchange servers in a local DAG. Install EMC Replication Enabler for Exchange (REE) and install Replication Manager agents on all severs in the DAG.

• Question 4:

  Which naviseccli performance counter is used to view stripe boundary crossing statistics?

  A. getdisk
  B. getcontrol
  C. getrg
  D. getlun
  D. getlun

• Question 5:

  You are migrating a database on NFS to a new VNX. The customer notes that you have designated only SAS drives for the database transaction logs and not any Flash drives. The customer believes that the Flash drives will greatly increase transaction log performance.

  What is the reason that you chose SAS drives?

  A. Flash drives are most efficient for small block random I/O
  B. SAS drives are just as efficient for sequential I/O
  C. The transaction logs vary in size and can be sequential or random I/O
  D. Databases cannot sustain multiple concurrent I/Os.
  B. SAS drives are just as efficient for sequential I/O

• Question 6:

  Your customer has a new VNX solution configured with Flash, SAS, and NL-SAS drives. The customer requires their OLTP, VDI, Software Development, and Regulatory Compliance workloads to be distributed between the different drive types. Due to limited drive quantities only one workload type can be configured using Flash drives.

  According to best practices which configuration best assigns the workloads?

  A. VDI on Flash drives; OLTP on SAS; Software Development on SAS; Regulatory Compliance on NL- SAS
  B. OLTP on Flash drives; VDI on SAS; Regulatory Compliance on SAS; Software Development on NL- SAS
  C. OLTP on Flash drives; VDI on SAS; Software Development on SAS; Regulatory Compliance on NL- SAS
  D. VDI on Flash drives; OLTP on SAS; Regulatory Compliance on SAS; Software Development on NL- SAS
  A. VDI on Flash drives; OLTP on SAS; Software Development on SAS; Regulatory Compliance on NL- SAS

• Question 7:

  What is a restriction for the High Bandwidth option for classic LUNs?

  A. Only supported for RAID 5 4+1 .
  B. Recommended for FLASH drives.
  C. Limited to VNX File OE LUNs.
  D. Only supported for RAID1/0 4+4.
  A. Only supported for RAID 5 4+1 .

• Question 8:

  A customer has implemented your VNX for File design for a high-performance CAD/CAM application. The design specified several NFS clients, each accessing a single file system in a single-threaded manner. You need to guarantee that each file system resides on an exclusive LUN set.

  Which value would you change?

  A. default_slice_flag
  B. is_greedy
  C. is_dynamic
  D. stripesize
  A. default_slice_flag

• Question 9:

  In designing a disk layout with multiple disk types, which metric should be used for data locality?

  A. Seek Distance
  B. Queue Length
  C. Response Time
  D. Utilization
  A. Seek Distance

• Question 10:

  A customer is using a virtualized environment with a large number of NFS datastores presented from a VNX system. They are experiencing more than expected network traffic on their datastore networks. According to EMC best practices, what recommendation should you make to your customer?

  A. Adjust NFS.ReadBufferSize and NFS.SendBufferSize to 64.
  B. Ensure that all VMware file systems are thin provisioned to improve NFS write I/O.
  C. Enable NFS write cache for all NFS datastores.
  D. Make sure that the NFS and VMKernel traffic is consolidated onto the same virtual switches.
  A. Adjust NFS.ReadBufferSize and NFS.SendBufferSize to 64.