QUESTION 251
An administrator receives a complaint that a virtual machine is performing poorly. The user attributes the issue to poor storage performance.
If the storage array is the bottleneck, which two counters would be higher than normal? (Choose two.)
A. Average ESXi VMKernel latency per command, in milliseconds
B. Average ESXi highest latency, in milliseconds
C. Average virtual machine operating system latency per command, in milliseconds
D. Number of SCSI reservation conflicts per second
Answer: BC
Explanation:
When the storage array is performing poorly or became a bottleneck, you will see the average ESXi highest latency in milliseconds. Moreover, the average virtual machine operation system latency per command will be high in milliseconds.
QUESTION 252
An administrator is informed that there will be a storage maintenance window and that failovers may occur.
What is the expected length of time that a Windows 2008 virtual machine storage I/O will pause during a path failover?
A. 0 to 30 seconds
B. 90 to 120 seconds
C. 60 to 90 seconds
D. 30 to 60 seconds
Answer: D
Explanation:
http://www.vmguru.nl/wordpress/2012/03/set-timeout-on-windows-guest-os-to-avoid-blue-screenserrors/ (3rd para)
QUESTION 253
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
Answer: D
Explanation:
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 254
Which resource management technique can be used to relieve a network bottleneck caused by a virtual machine with occasional high outbound network activity?
A. Convert the switch from a vSphere Standard Switch to a vSphere Distributed Switch.
B. Create a new portgroup for the virtual machine and enable traffic shaping.
C. Apply traffic shaping to the other virtual machines in the same port group.
D. Apply traffic shaping to the virtual machine with high activity.
Answer: B
Explanation:
A network bottleneck caused by a virtual machines with high outbound network activity can be relieved by creating a new portgroup for the virtual machine and enable traffic shaping. A traffic shaping policy is defined by average bandwidth, peak bandwidth, and burst size. You can establish a traffic shaping policy for each port group and each distributed port or distributed port group.
ESXi shapes outbound network traffic on standard switches and inbound and outbound traffic on distributed switches. Traffic shaping restricts the network bandwidth available on a port, but can also be configured to allow bursts of traffic to flow through at higher speeds.
QUESTION 255
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.
Answer: BC
Explanation:
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 256
Which of these factors indicates a high likelihood that the performance of a virtual machine disk is being constrained by disk I/O?
A. A large number of commands issued
B. A high device latency value
C. A high disk used value
D. A large number of kilobytes read and written
Answer: B
Explanation:
Disk performance bottlenecks are usually due to either Disk queue lenght or Disk Latency
QUESTION 257
What is one requirement when adding an extent to a VMFS datastore?
A. A new unused NFS mount
B. An RDM with sufficient space available
C. An unused iSCSI or FCP LUN
D. Free space on the LUN holding the VMFS datastore
Answer: C
Explanation:
http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1017662
QUESTION 258
What is a characteristic of a mapped SAN LUN (RDM) set to physical compatibility mode?
A. It allows the LUN to be made into a template
B. It allows the VMkernel to natively access NTFS data on the LUN
C. It allows the virtual machine to use VMware snapshots
D. It allows the guest operating system to access the hardware directly
Answer: D
Explanation:
http://www.vmware.com/files/pdf/techpaper/VMware-vSphere-Storage-API-Array-Integration.pdf
QUESTION 259
A 2TB VMFS3 datastore has been upgraded to VMFS5. The original block size was 2MB.
What effect will this upgrade have on the maximum file size supported by the datastore?
A. The maximum virtual disk size remains 512MB
B. The maximum virtual disk size increases to 1TB
C. The maximum virtual disk size increases to 32TB providing the datastore is also increased
D. The maximum virtual disk size increases to 2TB minus 512B
Answer: D
QUESTION 260
What are two functions of zoning in Fibre Channel switches? (Choose two.)
A. Controls and isolates LUNs on a Fibre Channel storage array
B. Restrict connections on a storage array to ESXi hosts that use the array
C. Prevents non-ESXi hosts from possibly destroying VMFS data
D. Reduces the number of targets and LUNs presented by a Fibre Channel storage array
Answer: CD
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