VMware VCP6-DCV 2V0-621D Questions & Answers

• Question 161:

  An administrator observes that virtual machine storage activity on an ESXi 6.x host is negatively affecting virtual machine storage activity on another host that is accessing the same VMFS Datastore. Which action would mitigate the issue?

  A. Enable Storage IO Control.

  B. Configure Storage DRS.

  C. Enable the Dynamic Queue Depth Throttling option.

  D. Configure the Disk.SchedNumReqOutstanding parameter.

  Correct Answer: A

  SIOC is extremely powerful, it can increase your consolidation ratios on the storage side, allowing more VM's per datastore. Which leads to lower storage costs and less administrative overhead.

  So how does it work? At a basic level SIOC is monitoring the end to end latency of a datastore. When there is congestion (the latency is higher than the configured value) SIOC reduces the latency by throttling back VM's who are using excessive I/O. Now you might say, I need that VM to have all of those I/O's, which in many cases is true, you simply need to give the VMDK(s) of that VM a higher share value. SIOC will use the share values assigned to the VM's VMDK's to prioritize access to the datastore.

  Just simply turning SIOC on will guarantee each VMDK has equal access to the datastore, shares fine tune that giving you the ability to give VMDK's more or less priority during times of contention.

  Reference: http://blogs.vmware.com/vsphere/2014/05/enabling-monitoring-storage-io- control.html

• Question 162:

  Which two statements are true regarding VMFS3 volumes in ESXi 6.x? (Choose two.)

  A. Creation of VMFS3 volumes is unsupported.

  B. Upgrading VMFS3 volumes to VMFS5 is supported.

  C. Existing VMFS3 volumes are unsupported.

  D. Upgrading VMFS3 volumes to VMFS5 is unsupported.

  Correct Answer: AB

  While a VMFS-3, which is upgraded to VMFS-5, provides you with most of the capabilities as a newly created VMFS-5, there are some differences. Both upgraded and newly created VMFS-5 support single-extent volumes up to 64TB and both support VMDK sizes of ~2TB, no matter what the VMFS file-block size is. However additional differences, although minor, should be considered when making a decision whether to upgrade to VMFS-5 or create new VMFS-5 volumes.

  Reference: http://www.vmware.com/files/pdf/techpaper/ VMFS-5_Upgrade_Considerations.pdf

• Question 163:

  Refer to the Exhibit.

  

  What will be created upon completion of the steps in this wizard?

  A. 100GB VMFS5 datastore with free space available for expansion

  B. 100GB VMFS5 datastore with free space available for a second datastore

  C. 100GB VMFS3 datastore

  D. 200.01 GB VMFS5 datastore

  Correct Answer: A

  As you can see in the exhibit, the 100GB VMFS5 datastore is created with free space available for expansion.

• Question 164:

  Refer to the Exhibit.

  

  An administrator wishes to provide Load Balanced I/O for the device shown in the Exhibit. To meet this requirement, which setting should be changed?

  A. Storage Array Type Policy = VMW_NMP_RR

  B. Path Selection Policy = Round Robin (VMware)

  C. Storage Array Type Policy = VMW_SATP_RR

  D. Path Selection Policy = MRU (VMware)

  Correct Answer: B

  In 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).

  Reference: https://pubs.vmware.com/vsphere-4-esx- vcenter/index.jsp?topic=/com.vmware.vsphere.config_fc.doc_40/esx_san_config/managing _san_systems/c_setting_a_path_selection_policy.html

• Question 165:

  Refer to the Exhibit.

  

  The list of devices attached to vmhba1 will be the basis for configuring a VMware Virtual SAN using Manual Mode. Based on the exhibit, which two combinations of devices should be used to create Disk Group(s)? (Choose two.)

  A. One Disk Group with one Flash Drive and three HDDs

  B. Two Disk Groups with one Flash Drive and two HDDs each

  C. One Disk Group with one Flash Drive and four HDDs

  D. Two Disk Groups with two Flash Drives and four HDDs each

  Correct Answer: AB

  To create the disk group, you have to build a disk group with a flash drive and three HDDs or you can build two groups with one flash drive and two HDDs each.

• Question 166:

  Refer to the Exhibit.

  

  What will be the result of selecting the highlighted device?

  A. Datastore will grow up to 200.01GB using the remaining free space on the device.

  B. Datastore will add 200.01GB by adding the device as a second extent.

  C. The device size can be expanded to be larger than 200.01 GB in size.

  D. The device is not suitable for this operation.

  Correct Answer: A

  The datastore will use up 200.01 GBof free space on the device.

• Question 167:

  Refer to the Exhibit.

  

  An administrator is using the esxtop command to troubleshoot storage performance issues on a virtual machine. The esxtop capture is shown in the Exhibit. Based on the exhibit, which two statements are true? (Choose two.)

  A. The iSCSI device is experiencing high latency.

  B. The ESXi kernel is experiencing high latency.

  C. The Guest OS is experiencing high latency and response time.

  D. The NFS device is experiencing high latency.

  Correct Answer: AC

  The iSCSI device is having high latency. You can see the response time peaking with high latency for Guest OS.

• Question 168:

  What are two use cases for Fibre Channel Zoning in a vSphere environment? (Choose two.)

  A. Increases the number of targets presented to an ESXi host.

  B. Controls and isolates paths in a fabric.

  C. Controls and isolates paths to an NFS share.

  D. Can be used to separate different environments.

  Correct Answer: BD

  Zoning provides access control in the SAN topology. Zoning defines which HBAs can connect to which targets. When you configure a SAN by using zoning, the devices outside a zone are not visible to the devices inside the zone. Reference: https://pubs.vmware.com/vsphere-55/index.jsp?topic= %2Fcom.vmware.vsphere.storage.doc%2FGUID-E7818A5D-6BD7-4F51-B4BA- EFBF2D3A8357.html

• Question 169:

  Which two considerations should an administrator keep in mind when booting from Software Fiber Channel over Ethernet (FCoE)? (Choose two.)

  A. Software FCoE boot configuration can be changed from within ESXi.

  B. Software FCoE boot firmware cannot export information in FBFT format.

  C. Multipathing is not supported at pre-boot.

  D. Boot LUN cannot be shared with other hosts even on shared storage.

  Correct Answer: CD

  When you boot the ESXi host from SAN using software FCoE, certain requirements and considerations apply.

  You cannot change software FCoE boot configuration from within ESXi. Coredump is not supported on any software FCoE LUNs, including the boot LUN.

  Multipathing is not supported at pre-boot.

  Boot LUN cannot be shared with other hosts even on shared storage.

  Reference: https://pubs.vmware.com/vsphere-55/index.jsp?topic= %2Fcom.vmware.vsphere.storage.doc%2FGUID-8E57EDC9-F122-4A81-8B80- FE19FFE832B1.html

• Question 170:

  Which two tasks does the Pluggable Storage Architecture (PSA) perform? (Choose two.)

  A. Handles I/O queueing to the logical devices.

  B. Handles physical path discovery, but is not involved in the removal.

  C. Handles physical path discovery and removal.

  D. Handles I/O queueing to FC storage HBAs.

  Correct Answer: AC

  When coordinating the VMware NMP and any installed third-party MPPs, the PSA performs the following tasks:

  Loads and unloads multipathing plug-ins.

  Hides virtual machine specifics from a particular plug-in. Routes I/O requests for a specific logical device to the MPP managing that device.

  Handles I/O queueing to the logical devices.

  Implements logical device bandwidth sharing between virtual machines. Handles I/O queueing to the physical storage HBAs.

  Handles physical path discovery and removal.

  Provides logical device and physical path I/O statistics.

  Reference: http://pubs.vmware.com/vsphere51/index.jsp?topic=%2Fcom.vmware.vsphere.storage.doc%2FGUID-C1C4A725-8BE4- 4875-919E-693812961366.html