VMware VMware Certifications VCP5-DCV Questions & Answers

• Question 471:

  The storage administrator has recommended testing the performance benefits of jumbo frames and enabled jumbo frames on the storage array. The VMware administrator has enabled jumbo frames on the VMkernel port used for the software iSCSI initiator.

  What other two components must be modified to enable jumbo frames support for the software iSCSI initiator? (Choose two.)

  A. The physical switch

  B. The port group

  C. The software initiator

  D. The virtual switch

  Correct Answer: AD

  Reference: http://www.interworks.com/blogs/kculwell/2010/01/29/enabling-jumbo-frames-vmware- esx-4

• Question 472:

  What are two methods of maximizing VMFS performance for virtual machines across all the hosts in a cluster? (Choose two.)

  A. Use disk shares to prioritize virtual machine disk I/O

  B. Enable Storage I/O control

  C. Enable Storage DRS with I/O load balancing

  D. Enable Host Cache using local SSD drives

  Correct Answer: BC

  To maximize VMFS performance of virtual machines, you can enable Storage I/O control and storage DRS with I/O load balancing. Reference: http://www.vmware.com/files/pdf/techpaper/VMW-vSphere41-SIOC.pdf

• Question 473:

  Which three requirements must be met in order to use Storage I/O Control? (Choose three.)

  A. The datastore must contain multiple VMFS extents.

  B. The datastore must contain a single NFS volume.

  C. The datastore must not include virtual machines with snapshots.

  D. The datastore must be managed by a single vCenter Server.

  E. Array-based automated storage tiering must be explicitly certified.

  Correct Answer: BDE

  Extents are only a single extent not multiples. Also, because NFS is not VMFS it does not use extents. You grow the NFS from the actual NAS appliance itself with extents.

  

• Question 474:

  What number of IOPS should be used with Storage I/O Control to limit disk throughput to roughly 10 MBps if the guest application writes 64KB blocks?

  A. 320

  B. 160

  C. 240

  D. 64

  Correct Answer: B

  Reference: http://www.vmware.com/files/pdf/techpaper/view_storage_considerations.pdf (page 3 and 4)

• Question 475:

  A company wants to increase disk capacity for their vSphere environment Management mandates that:

  1.

  vMotion must work in this environment.

  2.

  The existing LAN infrastructure must be used. Which storage option best meets the company objectives?

  A. iSCSI

  B. Fibre Channel

  C. SATA

  D. NFS

  Correct Answer: D

  NFS is a good choice to increase disk capacity of a vSphere environment in which vMotion can be used and the existing LAN infrastructure can be used.

• Question 476:

  An administrator has determined that storage performance to a group of virtual machines is reduced during peak activity. The virtual machines are located in a VMFS datastore called Production1 on an active-active storage array. The ESXi

  5.x

  host running the virtual machines is configured with an MRU multipathing policy.

  Which two actions can be taken to improve the storage performance of these virtual machines? (Choose two.)

  A.

  Add virtual storage, create a VMFS datastore called Production2 on the new storage, and then migrate some of the virtual machines from Production1 to Production2.

  B.

  Change the storage multipathing policy to Round Robin.

  C.

  Add physical storage, create a VMFS datastore called Production2 on the new storage, and then migrate some of the virtual machines from Production1 to Production2.

  D.

  Change the storage multipathing policy to Fixed with default settings.

  Correct Answer: BC

  Round Robin (VMware) The host uses an automatic path selection algorithm rotating through all available paths. This implements load balancing across all the available physical paths. Load balancing is the process of spreading server I/O requests across all available host paths. The goal is to optimize performance in terms of throughput (I/O per second, megabytes per second, or response times).

• Question 477:

  An administrator has deployed vCenter Data Recovery and wants the largest possible de- duplication store. Which three storage options can be used? (Choose three.)

  A. Two CIFS shares

  B. Two RDMs on a FCP array

  C. One NFS mount on the ESXi host and one RDMs on an iSCSI array

  D. One CIFS share and one FCP RDM

  E. Two NFS mounts on the ESXi host

  Correct Answer: BCE

  VDR supports deduplication stores that are up to one terabyte in size and each backup appliance is limited to using two deduplication stores per appliance ( 1 TB on VMDKs and RDMs and 500 GB on CIFS network shares). To get the largest possible dedup store, we must not use CIFS.

• Question 478:

  An administrator must decommission a datastore.

  

  Before unmounting the datastore, which three requirements must be fullfilled? (Choose three.)

  A. No virtual machines reside on the datastore.

  B. The datastore is not used for vSphere HA heartbeat.

  C. No registered virtual machines reside on the datastore.

  D. The datastore must not have any extents.

  E. The datastore must not be part of a datastore cluster.

  Correct Answer: ABE

• Question 479:

  An administrator is working to implement Storage Profiles in their environment. Which two ways can storage capabilities be generated? (Choose two.)

  A. They are generated by Datastore Clusters as LUNs are added to the cluster.

  B. They are automatically determined by the Storage Profile when it is created.

  C. They can be retrieved from the array through the VMware APIs for Storage Awareness (VASA).

  D. They can be manually generated by the administrator.

  Correct Answer: CD

  Understanding Storage Capabilities

  A storage capability outlines the quality of service that a storage system can deliver. It is a guarantee that the storage system can provide a specific set of characteristics for capacity, performance, availability, redundancy, and so on.

  If a storage system uses Storage APIs Storage Awareness, it informs vCenter Server that it can guarantee a specific set of storage features by presenting them as a storage capability. vCenter Server recognizes the capability and adds it to

  the list of storage capabilities in the Manage Storage Capabilities dialog box. Such storage capabilities are system-defined. vCenter Server assigns the system-defined storage capability to each datastore that you create from that storage

  system.

  NOTE:

  Because multiple system capabilities for a datastore are not supported, a datastore that spans several extents assumes the system capability of only one of its extents. You can create user-defined storage capabilities and associate them with

  datastores. You should associate the same user-defined capability with datastores that guarantee the same level of storage capabilities. You can associate a user-defined capability with a datastore that already has a system-defined

  capability. A datastore can have only one system-defined and only one user-defined capability at a time.

• Question 480:

  Which three statements regarding Network I/O Control (NetIOC) are accurate? (Choose three.)

  A. Isolation allows domination by any one traffic flow.

  B. Limits enforce maximum throughput control on a virtual machine.

  C. Enforce traffic bandwidth limit on the overall vDS set of dvUplinks.

  D. Load based teaming efficiently uses a vDS set of dvUplinks for network capacity.

  E. Relative shares fairly allocates available bandwidth among multiple flows.

  Correct Answer: CDE

  Reference: http://www.vmware.com/files/pdf/techpaper/VMW_Netioc_BestPractices.pdf (page 4)