Section 1 – Plan, Install and Upgrade VMware ESX/ESXi
- Objective 1.4 – Install VMware ESX/ESXi on SAN Storage
QUESTION 91
What is a characteristic of a mapped SAN LUN (RDM) set to Physical Compatibility mode?
A.allows the guest operating system to access the hardware directly
B.allows the VMkernel to natively access NTFS data on the LUN
C.allows the virtual machine to use VMware snapshots
D.allows the LUN to be made into a template
Answer: A
Explanation:
Fibre Channel SAN Configuration Guide ESX 4.0 ESXi 4.0 vCenter Server 4.0, page 59.
Physical compatibility mode allows the guest operating system to access the hardware directly
QUESTION 92
Which network technology does ESX Server require to transfer iSCSI commands?
A.SNMP
B.UD
C.IPX
D.TCP
Answer: D
Explanation:
In computing, iSCSI, is an abbreviation of Internet Small Computer System Interface, an Internet Protocol (IP)-based storage networking standard for linking data storage facilities. iSCSI uses TCP/IP (typically TCP ports 860 and 3260).
QUESTION 93
How many paths to a LUN can be simultaneously used when Round Robin multi-pathing is enabled?
A.Round Robin can use up to 4 paths simultaneously to send I/O.
B.Round Robin can use up to 2 paths simultaneously to send I/O.
C.Round Robin can be set to use additional paths simultaneously for every 1000 blocks of I/O transmitted.
D.Round Robin will use only one path to send I/O.
Answer: D
Explanation:
Fibre Channel SAN Configuration Guide ESX 4.0 ESXi 4.0 vCenter Server 4.0, page 25.
Round Robin (RR) Uses a path selection algorithm that rotates through all available paths enabling load balancing across the paths.
Round-Robin Load Balancing VMware ESX Server 3.5, VMware ESX Server 3i version 3.5, VMware VirtualCenter 2.5, page 1
When one path from the ESX Server host to the SAN becomes unavailable, the host switches to another path. ESX Server hosts can also use multipathing for load balancing.
When to switch – Specify that the ESX Server host should attempt a path switch after a specified number of I/O blocks have been issued on a path or after a specified number of read or write commands have been issued on a path. If another path exists that meets the specified path policy for the target, the active path to the target is switched to the new path.
Since the active path is switched to a new path, it can be assumed that only a single path is ever used at any given time, (D above).
QUESTION 94
If an ESX Server has both local and shared storage, which three partitions are required to reside on local storage? (Choose Three.)
A.swap
B./usr
C./boot
D.VMFS
E./
Answer: ACE
QUESTION 95
How is storage multi-pathing configured between an ESX Server and a supported storage array?
A.The multi-pathing driver is provided with ESX Server and is compatible with any supported storage array.
B.Your storage array vendor must provide you a multi-pathing driver for ESX Server and an agent to be installed in each Guest OS.
C.Your array vendor must provide you with an agent to be installed in each Guest OS.
D.Your storage array vendor must provide you with a multi-pathing driver for ESX Server.
Answer: A
Explanation:
iSCSI SAN Configuration Guide ESX 4.0 ESXi 4.0 vCenter Server 4.0, page 20.
By default, ESX/ESXi provides an extensible multipathing module called the Native Multipathing Plugin(NMP).
Generally, the VMware NMP supports all storage arrays listed on the VMware storage HCL and provides a default path selection algorithm based on the array type.
QUESTION 96
While performing a clean installation of ESX Server, the following partitions were created using the advanced partitioning option:
/boot = 100 MB
swap = 600 MB
/home = 2000 MB
/vmimages = 10000 MB
/var/log = 1500 MB
VMFS = use all available free space
You receive an error message and cannot continue. What is causing the error (Choose all that apply)?
A.ESX 3.x no longer requires a swap partition.
B./home needs to reside on the SAN.
C.The /boot partition is too small.
D.The / partition is missing.
Answer: CD
Explanation:
ESX and vCenter Server Installation Guide ESX 4.0 vCenter Server 4.0, page 61
Table 7-1. ESX Required Partitions Mount Point Type Size Location Partition Description
/boot ext3 The ESX boot disk requires 1.25 GB of free space and includes the /boot and vmkcore partitions. The /boot partition alone requires 1100MB.
/ ext3 Calculated dynamically based on the size of the /usr partition. By default, the minimum size is 5GB and no /usr partition is defined.
Note: the question uses partition sizes from VI3 days, not vSphere 4
QUESTION 97
Which two are requirements when booting from SAN? (Choose Two.)
A.Boot LUN must have an ID of 1.
B.The BIOS for the HBA must be enabled and correctly configured.
C.The boot LUN should be visible to all ESX Servers for HA failover.
D.The boot LUN should only be visible to the ESX Server that is booting from it.
Answer: BD
Explanation:
Fibre Channel SAN Configuration Guide ESX 4.0 ESXi 4.0 vCenter Server 4.0, page 31, 47, 48.
To facilitate BIOS configuration, mask each boot LUN so that only its own ESX system can see it. Each ESX system should see its own boot LUN, but not the boot LUN of any other ESX system. [D above]
When configuring the QLogic HBA BIOS to boot ESX from SAN, start with enabling the QLogic HBA BIOS [B above]
When you configure the Emulex HBA BIOS to boot ESX from SAN, you need to enable BIOS [ B above]
QUESTION 98
Click the Exhibit button. Given the information shown in the exhibit, which three statements are true? (Choose three.) Note: This server has not been modified from the default configuration
Exhibit: 
A.LUN has four paths.
B.LUN is on an Active/Passive array.
C.Preferred Path is vmhba2:2:0.
D.HBA Failover occurred.
E.LUN is on an Active/Active array.
Answer: ABD
Explanation:
Fibre Channel SAN Configuration Guide ESX 4.0 ESXi 4.0 vCenter Server 4.0, page 52, 53, 63, 64
Understanding Storage Device Naming Runtime Name
The name of the path to the device. The runtime name is created by the host. The name is not a reliable identifier for the device, and is not persistent. Since there are 4 entries, there are 4 paths. [A above]
With both active/active and active/passive storage arrays, you can set up your host to use different paths to different LUNs so that your adapters are being used evenly. Since the Status shows Active for the first entry and Passive for the remainder, the LUN is on an Active/Passive array. [B is correct, and therefore E is incorrect.] Active/passive arrays use the MRU path policy which does not have a preferred path.
Therefore C is incorrect.
Runtime Name – The name of the first path to the device. Since the Runtime Name is vmhba3:0:0 (from the top of the dialog box), and the active device is vmhba2:2:0 then it can be assumed that an HBA Failover occurred. Therefore D is correct.
QUESTION 99
Click the Exhibit button. The exhibit shows paths of a SAN LUN. What is the LUN number?
Exhibit
A.1
B.0
C.2
D.3
Answer: B
Explanation:
Fibre Channel SAN Configuration Guide ESX 4.0 ESXi 4.0 vCenter Server 4.0, page 53
Understanding Storage Device Naming Runtime Name
The name of the path to the device. The runtime name is created by the host. The name is not a reliable identifier for the device, and is not persistent. The runtime name has the following format:
vmhba#:C#:T#:L#, where
vmhba# is the name of the storage adapter. The name refers to the physical adapter on the host, not to the SCSI controller used by the virtual machines.
C# is the storage channel number.
T# is the target number. Target numbering is decided by the host and might change if there is a change in the mappings of targets visible to the host. Targets that are shared by different hosts might not have the same target number.
L# is the LUN number that shows the position of the LUN within the target. The LUN number is provided by the storage system. If a target has only one LUN, the LUN number is always zero (0).
For example, vmhba1:C0:T3:L1 represents LUN1 on target 3 accessed through the storage adapter vmhba1 and channel 0.
Therefore vmhba2:2:0, vmhba2:3:0, vmhba3:0:0 and vmhba3:1:0 all have a LUN number of 0.
QUESTION 100
Virtual disks in VMFS-3 volumes can be a _____. (Choose two.)
A.set of files accompanied by quorum files
B.single file
C.set of files
D.single file with a quorum file
Answer: BC
Explanation:
What Files Make Up a Virtual Machine?
A virtual disk is made up of one or more .vmdk files. If you have specified that the virtual disk should be split into 2GB chunks, the number of .vmdk files depends on the size of the virtual disk. As data is added to a virtual disk, the .vmdk files grow in size, to a maximum of 2GB each
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