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18 questions selected from source version V8.02
VMWARE CLOUD FOUNDATION SUPPORT
Question 1
A development Virtual Machine is experiencing extreme latency. You open esxtop on the underlying ESXi
host and press 'm' to enter the Memory view. You suspect the ESXi host is running out of physical RAM and
has started forcing VMs to reclaim memory. Match the esxtop memory metric (1-3) with its correct definition
(A-C).
Metrics:
1. MCTLSZ
2. SWCUR
3. ACTV
Definitions:
A) The amount of memory currently being actively read/written by the guest OS.
B) The amount of memory reclaimed by the ESXi host using the VMware Tools Balloon Driver.
C) The amount of memory actively swapped to the hypervisor's physical disk swap file.
A. 1-B, 2-C, 3-A
B. 1-C, 2-B, 3-A
C. 1-A, 2-C, 3-B
D. 1-B, 2-A, 3-C
Answer: A
Explanation
● 1. MCTLSZ (Memory Control Size) matches B. This is the memory ballooning metric. A value > 0 means the host is under
contention and forcing the guest OS to page out memory.
● 2. SWCUR (Swap Current) matches C. This represents VM memory swapped to the ESXi disk, which is severely
detrimental to performance.
● 3. ACTV (Active) matches A. This is the hypervisor's estimate of how much memory the VM is actively touching at this
exact moment.
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Question 2
You are troubleshooting a heavily utilized database VM that suddenly experienced an OS-level file system
crash. You suspect a storage queue bottleneck. Using esxtop on the underlying ESXi host, you observe the
disk metrics for the specific LUN where the VM resides. The DAVG/cmd (Device Average Latency) is
consistently very low (around 2ms), but the KAVG/cmd (Kernel Average Latency) is consistently spiking
above 35ms.
What is the precise root cause of this performance discrepancy, and how should you address it?
A. The physical storage array is overloaded and cannot process I/O fast enough; the solution is to add more
cache to the physical SAN.
B. The ESXi host's physical HBA adapter is failing and dropping FC frames; the solution is to replace the
PCIe HBA card.
Page 2
18 questions selected from source version V8.02
VMWARE CLOUD FOUNDATION SUPPORT
Question 1
A development Virtual Machine is experiencing extreme latency. You open esxtop on the underlying ESXi
host and press 'm' to enter the Memory view. You suspect the ESXi host is running out of physical RAM and
has started forcing VMs to reclaim memory. Match the esxtop memory metric (1-3) with its correct definition
(A-C).
Metrics:
1. MCTLSZ
2. SWCUR
3. ACTV
Definitions:
A) The amount of memory currently being actively read/written by the guest OS.
B) The amount of memory reclaimed by the ESXi host using the VMware Tools Balloon Driver.
C) The amount of memory actively swapped to the hypervisor's physical disk swap file.
A. 1-B, 2-C, 3-A
B. 1-C, 2-B, 3-A
C. 1-A, 2-C, 3-B
D. 1-B, 2-A, 3-C
Answer: A
Explanation
● 1. MCTLSZ (Memory Control Size) matches B. This is the memory ballooning metric. A value > 0 means the host is under
contention and forcing the guest OS to page out memory.
● 2. SWCUR (Swap Current) matches C. This represents VM memory swapped to the ESXi disk, which is severely
detrimental to performance.
● 3. ACTV (Active) matches A. This is the hypervisor's estimate of how much memory the VM is actively touching at this
exact moment.
VMWARE CLOUD FOUNDATION SUPPORT
Question 2
You are troubleshooting a heavily utilized database VM that suddenly experienced an OS-level file system
crash. You suspect a storage queue bottleneck. Using esxtop on the underlying ESXi host, you observe the
disk metrics for the specific LUN where the VM resides. The DAVG/cmd (Device Average Latency) is
consistently very low (around 2ms), but the KAVG/cmd (Kernel Average Latency) is consistently spiking
above 35ms.
What is the precise root cause of this performance discrepancy, and how should you address it?
A. The physical storage array is overloaded and cannot process I/O fast enough; the solution is to add more
cache to the physical SAN.
B. The ESXi host's physical HBA adapter is failing and dropping FC frames; the solution is to replace the
PCIe HBA card.
Page 2
