Nova sheduler is the component in OpenStack that is responsible for launching instances (virtual servers) and deciding in what physical machines (hosts, nodes) they should be launched.

The built-in scheduler is the Filter Scheduler. It is parametrizable and operates in phases: i) gathering state of all compute nodes; ii) finding suitable hosts; iii) choosing the best nodes.

Consider a scenario where the developer wants to launch a VM instance that requires that requires:
- 4 VCPUs and
- 4 GB of memory
Furthermore, he/she wants to employ a consolidation policy (i.e. attempt at making the new VM instance and any VMs already in execution fit into as few hosts as possible, regarding CPU and memory in a equally balanced way).

How can the custom filters and weights of this algorithm be parametrized/configured in order to achieve these goals ?

(select the option that best fits the question).

Question

Nova sheduler is the component in OpenStack that is responsible for launching instances (virtual servers) and deciding in what physical machines (hosts, nodes) they should be launched. 
  
 The built-in scheduler is the Filter Scheduler. It is parametrizable and operates in phases: i) gathering state of all compute nodes; ii) finding suitable hosts; iii) choosing the best nodes. 
  
 Consider a scenario where the developer wants to launch a VM instance that requires that requires: 
 - 4 VCPUs and  
 - 4 GB of memory  
 Furthermore, he/she wants to employ a consolidation policy (i.e. attempt at making the new VM instance and any VMs already in execution fit into as few hosts as possible, regarding CPU and memory in a equally balanced way). 
  
 How can the custom filters and weights of this algorithm be parametrized/configured in order to achieve these goals ? 
   
 (select the option that best fits the question).

Answer

Use filters (vcpus_total >= 4; free_ram_mb >= 4096), use weights (RAMWeigher = -1; CPUWeigher= -1).

Answer

No response (no penalty if only option answered).

Answer

Use filters (vcpus_total >= 4; free_ram_mb >= 4096), use weights (RAMWeigher = 1; CPUWeigher= -1).

Answer

Use filters (vcpus_total >= 4; free_ram_mb >= 4096), use weights (RAMWeigher = 1; CPUWeigher= 1).

Answer

Use filters (vcpus_total >= 8; free_ram_mb >= 8192), use weights (RAMWeigher = -1; CPUWeigher= 1).

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Nova sheduler is the component in OpenStack that is responsible for launching in...

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