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<body class='hmmessage'><div dir='ltr'><div>hi,all</div><div><br></div><div>Currently,when placing VMs on hosts, a PM cannot host any more VM</div><div>as long as an arbitrary dimensional resource is exhausted</div><div>even when all other dimensional resources are sufficient, a</div><div>phenomenon well-known as bucket effects.</div><div><br></div><div>we can place VMs based on all kinds of the resource utilization ratio, as far as</div><div>possible to reduce resource fragments. For example, the PM_ration can be expressed as </div><div>(usedcpu/totalcpu, ramused/totalram, diskused/totaldisk,.....). when placing on vm, </div><div>we can calculate the PM_ration:</div><div>PM_ration* = ((usedcpu+vm_cpu)/totalcpu, (ramused+vm_ram)/totalram, (diskused+vm_disk)/totaldisk,.....)</div><div>and then we can select host based on the avg and standard deviation of the host's PM_ratio.</div><div><br></div><div>please let me know if you have any question or advice.</div><div><br></div><div>thanks</div><div>--</div><div>zhangtralon</div><div><br></div> </div></body>
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