Podcast
Questions and Answers
What is the responsibility of the hotspot detection algorithm in VM migration?
What is the responsibility of the hotspot detection algorithm in VM migration?
- Automatically adjusting network bandwidth based on utilization
- Monitoring the physical server's temperature to prevent overheating
- Signalling a need for VM migration when SLA violations are detected (correct)
- Directly migrating virtual servers to prevent hotspots
In the black-box approach, how is a hotspot identified on a physical server basis?
In the black-box approach, how is a hotspot identified on a physical server basis?
- Memory utilization of the VM exceeding a threshold
- Total swap activity being below a certain level
- Aggregate CPU or network utilizations exceeding a threshold (correct)
- Response time or request drop rate exceeding SLA-specified values
What triggers the flagging of a hotspot in the gray-box approach?
What triggers the flagging of a hotspot in the gray-box approach?
- Network bandwidth allocation being underutilized
- CPU utilization reaching maximum capacity
- Memory utilization of the VM exceeding a threshold (correct)
- Total swap activity exceeding a threshold
How is a hotspot flagged to avoid unnecessary migrations?
How is a hotspot flagged to avoid unnecessary migrations?
What determines whether a transient spike will trigger a migration?
What determines whether a transient spike will trigger a migration?
How can the aggressiveness of hotspot detection be adjusted?
How can the aggressiveness of hotspot detection be adjusted?
What type of statistics can be gathered at the OS-level in Linux for monitoring CPU, network, and memory usage?
What type of statistics can be gathered at the OS-level in Linux for monitoring CPU, network, and memory usage?
What is the purpose of utilizing a light-weight monitoring daemon in each virtual server?
What is the purpose of utilizing a light-weight monitoring daemon in each virtual server?
What does memory hotspot detection enable in the context of monitoring virtual servers?
What does memory hotspot detection enable in the context of monitoring virtual servers?
How does direct monitoring of application-level statistics differ from the black-box approach in terms of SLA violations detection?
How does direct monitoring of application-level statistics differ from the black-box approach in terms of SLA violations detection?
What does a hotspot indicate in the context of resource management for VMs?
What does a hotspot indicate in the context of resource management for VMs?
Before resolving a hotspot through migrations, what must the system estimate?
Before resolving a hotspot through migrations, what must the system estimate?
Why is black-box monitoring of memory challenging in Xen?
Why is black-box monitoring of memory challenging in Xen?
In what scenarios is black-box monitoring useful?
In what scenarios is black-box monitoring useful?
What is a challenge of trapping each memory access for monitoring?
What is a challenge of trapping each memory access for monitoring?
Why is black-box monitoring particularly useful in corporate data centers?
Why is black-box monitoring particularly useful in corporate data centers?
What method can be used to observe memory accesses within each VM in Xen?
What method can be used to observe memory accesses within each VM in Xen?
What determines the feasibility of performing OS instrumentation in a virtual server environment like Amazon's EC2?
What determines the feasibility of performing OS instrumentation in a virtual server environment like Amazon's EC2?
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