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In line 2, it calculates and sorts the VM in operation mode. In lines 3 to 4, it means to shut down a VM in hot mode if the reliability of the current system goes beyond the limit. In lines 5 to 11, if the current system reliability is in the normal range, it shall consider whether the VM failure rate in a single operation mode is too high. If it is, then a VM in hot mode shall be turned into operation mode and the VM in operation mode shall be turned into the cold mode to update the collection elements of various modes. In lines 12 to 29, it refers that the reliability of current system is smaller than the lower limiting value. Line 14 is to save the current set. Line 16 is to add a VM in the hot mode to the operation mode. Line 17 is to turn the VM in operation mode with the highest failure rate into the cold mode. Line 18 is to put a VM in cold mode in the collection of the hot mode. In lines 19 to 23, system reliability is reevaluated. If it meets the requirements, the collection elements are updated and the loop ends. In lines 25 to 28, it refers to no increase in VM quantity in hot mode. Because the transfer between modes cannot meet the reliability requirements, it is necessary to add a hot mode virtual machine, restore the collection, and add a cold mode virtual machine to the hot mode to update the collection. |
IEEE/ICACT20210154 Slide.11
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