VMware VMware Certifications 2VB-601 Questions & Answers

• Question 51:

  Which statement is true about vSAN three-node cluster configuration?

  A. Three-node clusters can tolerate a maximum of 2 host failures as long as there are at least 2 disk groups in each host.

  B. A storage policy with a RAID-5/6 erasure coding rule cannot be applied to a virtual machine object.

  C. A storage policy with a deduplication and compression rule can be applied to a virtual machine object.

  D. Three-node clusters can tolerate a maximum of 2 host failures.

  Correct Answer: BC

  B ?It's true that RAID 5/6 erasure coding can only be enabled for all flash configurations. But the question does not specify if it's a hybrid or all flash configuration. Also erasure coding setting is not a vm base setting its cluster base setting. 3-Node Configurations While vSAN fully supports 2-node and 3-node configurations, these configurations can behave differently than configurations with 4 or greater nodes. In particular, in the event of a failure, there are no resources to rebuild components on another host in the cluster to tolerate another failure. Also with a 2-node and 3node configurations, there is no way to migrate all data from a node during maintenance. In 2-node and 3node configurations, there are 2 replicas of the data and a witness, and these must all reside on different hosts. A 2-node and 3-node configuration can only tolerate 1 failure. The implications of this are that if a node fails, vSAN cannot rebuild components, nor can it provision new VMs that tolerate failures. It cannot re-protect virtual machine objects after a failure until the failed components are restored.

  Design decision: Consider 4 or more nodes for the vSAN cluster design for maximum availability

  Multiple disk groups and 3-node clusters Another advantage of multiple disk groups over single disk group design applies to 3-node clusters. If there is only a single disk group per host in a 2-node and 3-node cluster, and one of the flash cache devices fails, there is no place for the components in the disk group to be rebuilt. However, if there were multiple disk groups per host, and if there is sufficient capacity in the other disk group on the host when the flash cache device fails, vSAN would be able to rebuild the affected components in the remaining disk group. This is another consideration to keep in mind if planning to deploy 2-node and 3-node vSAN clusters.

• Question 52:

  An administrator is deploying vSAN 6.6.

  What must the administrator configure to set up vSAN networking?

  A. IGMP snooping on the switch

  B. A class A network address

  C. A matching subnet mask on all vSAN VMkernel ports

  D. A vSAN VMkernel port on each host in the cluster

  Correct Answer: CD

  We validate that we have vmkernel adapters setup for vSAN traffic. The wizard will notify us if there are any issues here.

  

  References: https://www.virtualizationhowto.com/2017/04/vmware-vsan-6-6-configuration-and-new-features/

• Question 53:

  The following are the configuration details of a 12-node all-flash VSAN cluster:

  1.

  Every node has one disk group

  2.

  Each disk group consists of one cache device and six capacity devices

  Which two methods can be used to increase the size of the cache tier in each host? (Choose two.)

  A. Promote a capacity device to a cache device so that each disk group has two cache devices.

  B. Add a new cache device to the host. Reconfigure the host to have two disk groups with one cache device and three capacity devices per disk group.

  C. Add a second cache device to each disk group.

  D. Replace the existing cache device in each disk group with a larger cache device.

  Correct Answer: CD

  As you create disk groups on each host and add cache and capacity devices, the size of the datastore increases according to the amount of physical capacity added by those devices.

  Typically, you delete devices or disk groups from vSAN when you are upgrading a device or replacing a failed device, or when you must remove a cache device.

• Question 54:

  Which VMware-recommended tool provides specific information on the best strategy for a vSAN deployment?

  A. vSAN VIP Assessment Tool

  B. vSAN TCO and Sizing Calculator

  C. vSAN Health Check UI

  D. vSAN ReadyNode Configurator

  Correct Answer: D

  vSAN ReadyNode Configurator Selecting a vSAN ReadyNode is simple. Choose the vSAN version you want to deploy, pick a ReadyNode profile based on your specific needs, select your preferred server vendor, and then pick one of the available models.

  Note: vSAN ReadyNode are x86 servers, available from all the leading server vendors, that have been preconfigured, tested and certified for VMware Hyper-Converged Infrastructure Software. Each ReadyNode is optimally configured for vSAN with the required amount of CPU, memory, network, I/O controllers and storage (SSDs, HDDs or flash devices).

  Some ReadyNode are available with additional options aimed at simplifying purchasing, deployment, and support. These options are only available for select server vendors and ReadyNode models:

  1.

  Pre-installed Hyper-Converged Infrastructure Software

  2.

  Bundled Hyper-Converged Infrastructure Software licenses

  3.

  Single vendor support from the server vendor to cover both hardware and Hyper-Converged Infrastructure Software

  Incorrect Answers:

  B: VMware Virtual SAN Sizing Tool All Virtual SAN customers and enthusiasts can easy get sizing ideas and estimations on the amount hardware resources necessary to support a particular Virtual SAN design. All you will need to do is provide a few virtual machine inputs based on capacity, performance, and availability requirements. The purpose of this tool is to help determine the hardware specifications for hosts in a Virtual SAN cluster required to run a set of virtual machines defined by a set of input characteristics.

• Question 55:

  How many consecutive heartbeats of communication must be lost between master and the witness host for the witness host to be deemed to have failed?

  A. 5

  B. 7

  C. 3

  D. 10

  Correct Answer: A

  If communication is lost for 5 consecutive heartbeats (5 seconds) between the master and the Witness, the Witness is deemed to have failed.

  References:https://storagehub.vmware.com/export_to_pdf/vsan-stretched-cluster-2-node-guide, page 51

• Question 56:

  Which two factors below determine how a VMDK object will be split on a vSAN cluster? (Choose two.)

  A. Checksum parameter

  B. Free capacity in the cache tier devices

  C. Size of the VMDK object

  D. Stripe width parameter

  Correct Answer: CD

  Note: Number Of Disk Stripes Per Object, commonly referred to as stripe width, is the setting that defines the minimum number of capacity devices across which each replica of a storage object is distributed.

• Question 57:

  Exhibit:

  

  View the exhibit.

  The following are configuration details for a three-node all-flash vSAN cluster

  1.

  Each node is identical in number of drives and disk controllers

  2.

  Each node has 4 x 500 GB SSD Capacity Tier, 1 x 200 GB SSD cache tier

  What is the raw capacity of this cluster as configured?

  A. 6.6 TB

  B. 3 TB

  C. 6 TB

  D. 4 TB

  Correct Answer: C

  To determine the raw capacity of a Virtual SAN datastore, multiply the total number of disk groups in the cluster by the size of the capacity devices in those disk groups, and subtract the overhead required by the Virtual SAN on-disk format.

  Reference: https://docs.vmware.com/en/VMware-vSphere/6.5/com.vmware.vsphere.virtualsan.doc/GUID581D2D5C-A88F-4318-A8B3-5A5F343F1247.html

• Question 58:

  For a hybrid vSAN configuration, the SSD resides in which tier?

  A. Read tier

  B. Write tier

  C. Cache tier

  D. Capacity tier

  Correct Answer: C

  In a VMware vSAN configuration, the SSDs are used for the vSAN caching layer for hybrid deployments and for the capacity layer for all flash.

  References: https://docs.vmware.com/en/VMware-Validated-Design/4.0/com.vmware.vvd.sddc-design.doc/GUID51680487-239F-4FF7-B43A-8C1D98263DB1.html

• Question 59:

  If the Primary level of failures to tolerate policy is changed from 2 to 3 without shutting down the virtual machine, what will happen when the policy is applied?

  A. It will fail with an alert. Primary level of failures to tolerate=3 is not supported with mirroring.

  B. It will fail with an alert. The policy of a running VM cannot be dynamically changed.

  C. vSAN will try to create an additional mirror of the VM's disk components, as long as there is a sufficient number of fault domains and available capacity.

  D. vSAN will switch its failure to tolerate method for any VMs with that policy, to optimize for space. Primary level of failures to tolerate=3 can only be accomplished with erasure coding.

  Correct Answer: C

  Incorrect Answers:

  D: RAID 5 or RAID 6 erasure coding does not support a Primary level of failures to tolerate value of 3.

  Note: Primary level of failures to tolerate Defines the number of host and device failures that a virtual machine object can tolerate. For n failures tolerated, each piece of data written is stored in n+1 places, including parity copies if using RAID 5 or RAID

  6.

  When provisioning a virtual machine, if you do not choose a storage policy, vSAN assigns this policy as the default virtual machine storage policy.

  If fault domains are configured, 2n+1 fault domains with hosts contributing capacity are required. A host, which is not part of any fault domain is considered its own single-host fault domain.

  Default value is 1. Maximum value is 3.

  References: https://docs.vmware.com/en/VMware-vSphere/6.5/com.vmware.vsphere.virtualsan.doc/GUID-08911FD32462-4C1C-AE81-0D4DBC8F7990.html

• Question 60:

  An administrator is designing a vSAN cluster for a number of new workloads. The design calls for the use of erasure coding with RAID 5.

  Which statement is true about what is needed to meet the needs of this scenario?

  A. vSAN Standard licensing is sufficient

  B. vSAN Enterprise licensing is required

  C. An all-flash configuration is required.

  D. Six nodes are required at a minimum.

  Correct Answer: C

  RAID 5 or RAID 6 erasure coding is available only on all-flash disk groups.

  References: https://docs.vmware.com/en/VMware-vSphere/6.5/com.vmware.vsphere.virtualsan.doc/GUID-6D8185558DE8-4F06-9498-66903FB9C775.html